5305:
5362:
5422:
3976:
347:. The Bobs Ridge Sandstone and Tioga Bentonite indicate uplift and volcanic activity in the region, respectively. The Tioga Bentonite, sometimes called the Tioga Ash Bed or Metabentonite, lies at the base of the
2778:
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1323:
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697:
972:
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682:
1032:
1022:
899:
888:
1141:
1125:
1083:
1072:
1281:
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282:
event. The chert has a mottled appearance due to a heterogenous structure of pure and discolored chert. The darker chert is heavily fractured and contains impurities such as
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1047:
1037:
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831:
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904:
852:
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687:
523:
1313:
1250:
1146:
836:
3337:
3299:
1214:
1042:
780:
2713:
1130:
920:
821:
790:
765:
5510:
3620:
2907:
2785:
1240:
1176:
841:
826:
770:
4950:
3720:
3560:
3532:
2500:
1951:
1900:
1182:
1166:
1017:
914:
3695:
2956:
2659:
2518:
1771:
1735:
1472:
1335:
1155:
977:
883:
644:
634:
629:
3791:
3735:
3650:
3008:
2976:
2971:
2874:
1776:
1740:
1621:
1618:
Gantz, Hundred-foot sand, Fifty-foot sand, Thirty-foot sand, Nineveh-Snee, Gordon Stray, Fourth Sand, Fifth Sand, Bayard Sand, Elizabeth Sand, Sweet
Richard,
1585:
1432:
1365:
1135:
1119:
1012:
858:
805:
599:
1642:
Upper Warren, Lower Warren, Speechely Stray, Speechely, Balltown A, Balltown B, Balltown C, Sheffield, First
Bradford, Second Bradford, Third Bradford, Kane
5070:
4960:
3796:
2902:
2892:
2723:
2244:
1895:
1409:
5257:
4832:
3655:
3023:
2753:
2610:
1956:
1683:
1286:
1276:
1225:
1197:
987:
982:
878:
624:
614:
609:
252:
5399:
3888:
3750:
3745:
3710:
3645:
3372:
3003:
2993:
2859:
2605:
2510:
2505:
2480:
2475:
2470:
1730:
1442:
1376:
1354:
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654:
278:, though well logs indicate that it was present deep underground in other states in the region. It represents a deep-water environment during a major
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3801:
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3640:
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3166:
3133:
2864:
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1219:
1067:
815:
702:
662:
2869:
1631:
893:
846:
692:
604:
516:
2920:
2897:
1607:
1077:
2854:
1208:
649:
639:
619:
5392:
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1649:
509:
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405:"Huntersville Chert (Devonian) extending from southwestern Virginia into southwestern New York, and its Bobs Ridge Sandstone Member"
5296:
Please do not edit or blank the template, or remove it from articles where it is used, while the discussion is in progress. ›
5505:
5466:
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429:
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5495:
5290:
236:
375:
318:
forming the chert. Compared to equivalent formations, the composition of the
Huntersville Chert is at least 50% chert.
5500:
5490:
5339:
5459:
180:
2129:
2111:
2093:
1707:
137:
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2846:
1095:
5372:
5332:
45:
5520:
5282:
5168:
4148:
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3013:
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732:
5452:
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3675:
2180:
5121:
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4955:
4725:
4165:
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3680:
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2345:
322:
5440:
5380:
5320:
5188:
5065:
4909:
4428:
4234:
3893:
3811:
3786:
3715:
3437:
3409:
3197:
2998:
2718:
2615:
2561:
2447:
2083:
1963:
1790:
1580:
1468:
925:
868:
755:
672:
486:
291:
279:
8:
5252:
5026:
4932:
4827:
4804:
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4270:
4265:
4248:
4229:
4201:
3942:
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3610:
3565:
3542:
3537:
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3156:
3123:
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2442:
2409:
2388:
1992:
1712:
1600:
1447:
1427:
1392:
952:
412:
Stratigraphic Notes, 1980-1982: Contributions to
Stratigraphy, Geological Survey Bulletin
208:
5240:
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3327:
3294:
3289:
3151:
3118:
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3018:
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1702:
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1056:
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532:
295:
256:
244:
224:
81:
67:
3961:
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5183:
5173:
5148:
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4975:
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4224:
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3730:
3690:
3660:
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2708:
2691:
2674:
2664:
2594:
2549:
2527:
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2340:
2143:
1813:
1508:
1416:
799:
501:
455:
311:
5432:
5036:
4965:
4899:
4876:
4859:
4799:
4772:
4639:
4629:
4594:
4438:
4298:
4275:
4219:
3778:
3705:
3700:
3670:
3592:
3515:
3501:
3478:
3442:
3414:
3377:
3322:
3317:
3225:
3064:
2966:
2683:
2573:
2434:
2364:
2319:
2204:
2138:
1946:
1941:
1866:
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1437:
1307:
1260:
1234:
589:
463:
344:
336:
71:
5304:
376:"Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau"
5163:
5138:
4809:
4507:
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4385:
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4183:
3615:
3483:
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3180:
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2763:
2650:
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2383:
2185:
1925:
1910:
1838:
1678:
1519:
1103:
946:
348:
315:
303:
118:
63:
5436:
5376:
5316:
5224:
5013:
4553:
4536:
4517:
4502:
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4423:
4363:
3934:
3878:
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3271:
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3235:
3202:
3161:
3128:
3091:
2961:
2328:
2079:
2058:
2044:
1981:
1930:
1833:
1760:
1719:
1697:
1558:
1007:
307:
248:
232:
5479:
4621:
4443:
4390:
4331:
4139:
4121:
3996:
3364:
3051:
2828:
2459:
2372:
2172:
1880:
1851:
1847:
1595:
1524:
1514:
749:
723:
583:
480:
271:
216:
165:
147:
27:
314:
dust blowing in from hot, dry areas may also be responsible for some of the
5369:
4745:
4720:
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4666:
4649:
4257:
3493:
3392:
2939:
2398:
2308:
2264:
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2193:
1876:
1822:
1497:
1401:
536:
228:
157:
5215:
5206:
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4984:
4914:
4308:
4004:
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3033:
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2746:
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1482:
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468:
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5178:
5114:
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4868:
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4658:
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3583:
3401:
3309:
2884:
2425:
2225:
2121:
1667:
1299:
938:
575:
329:
326:
283:
212:
133:
5233:
5097:
5005:
4781:
4372:
4084:
4026:
3524:
3100:
2817:
2640:
1567:
555:
240:
114:
110:
106:
5285:
below has been proposed for deletion. Please share your thoughts at
4290:
2985:
1660:
1st Elk Sand, 2nd Elk Sand, 3rd Elk Sand, 4th Elk Sand, 5th Elk Sand
1460:
5429:
5088:
4924:
4819:
4712:
4681:
4612:
4494:
4471:
4410:
4354:
4157:
4113:
4068:
4057:
4015:
3825:
3552:
3470:
3429:
3355:
3212:
3189:
3143:
3082:
2798:
2631:
2300:
2256:
2163:
1973:
1919:
1752:
1549:
741:
275:
264:
219:. It is primarily composed of mottled white, yellow, and dark grey
205:
161:
35:
4568:
4095:
3281:
2103:
566:
299:
4891:
4545:
4037:
3258:
2067:
260:
31:
5361:
5421:
270:
Most
Huntersville Chert outcrops are located in southeastern
220:
96:
340:
287:
383:
Virginia Tech
Scholarly Works, Department of Geosciences
306:, as some chert facies are primarily composed of hollow
231:. The Huntersville Chert is laterally equivalent to the
3991:
531:
483:"Fossilworks: Gateway to the Paleobiology Database"
481:Various Contributors to the Paleobiology Database.
321:The uppermost layers of the Huntersville Chert are
2793:
456:"Eolian Dust and the Origin of Sedimentary Chert"
5477:
251:to the east. These formations are placed in the
5511:Southern United States geologic formation stubs
5460:
5400:
5340:
3977:
2779:
517:
427:
239:. It is also laterally equivalent to a sandy
374:Read, J. Fred; Eriksson, Kenneth A. (2012).
373:
339:. They are directly overlain by a prominent
5467:
5453:
5407:
5393:
5347:
5333:
3984:
3970:
2786:
2772:
524:
510:
302:crystals. The chert is at least partially
467:
428:Sherrard, S.J.; Heald, M.T. (June 1984).
267:stages of the broader Devonian system.
223:, and is separated from the underlying
16:Geologic formation in the United States
5478:
1346:Lower Connoquenessing Sandstone Member
1324:Upper Connoquenessing Sandstone Member
332:. These layers have been named as the
3965:
2767:
505:
453:
430:"Petrology of the Huntersville Chert"
243:unit which is often equated with the
5416:
5356:
5299:
462:. Open-File Report 2004-1098: 1–13.
423:
421:
402:
398:
396:
394:
392:
369:
367:
365:
363:
13:
698:Middle Washington Limestone Member
14:
5532:
973:Lower Pittsburgh Limestone Member
963:Upper Pittsburgh Limestone Member
708:Lower Washington Limestone Member
683:Upper Washington Limestone Member
418:
389:
360:
5486:Devonian geology of Pennsylvania
5420:
5360:
5303:
1033:Lower Saltsburg Sandstone Member
1023:Upper Saltsburg Sandstone Member
900:Lower Sewickley Sandstone Member
889:Upper Sewickley Sandstone Member
1142:Upper Freeport Limestone Member
1126:Upper Freeport Limestone Member
1084:Lower Mahoning Sandstone Member
1073:Upper Mahoning Sandstone Member
5506:Stub-Class Appalachia articles
5368:This article about a specific
447:
1:
5516:West Virginia geography stubs
1282:Lower Mercer Limestone Member
1272:Upper Mercer Limestone Member
354:
294:grains, organic material, or
5496:Devonian geology of Virginia
5439:. You can help Knowledge by
5428:This article related to the
5379:. You can help Knowledge by
5319:. You can help Knowledge by
259:, roughly equivalent to the
7:
2039:Bobs Ridge Sandstone Member
1189:Kittanning Sandstone Member
1048:Bush Creek Limestone Member
1038:Pine Creek Limestone Member
968:Little Pittsburgh coal seam
896:"Meigis Creek" "No. 9 Coal"
832:Waynesburg Limestone Member
181:Huntersville, West Virginia
55:Bobs Ridge Sandstone Member
10:
5537:
5415:
5355:
5298:
3769:Pinesburg Station Dolomite
2130:Helderberg Group (geology)
2112:Helderberg Group (geology)
2094:Helderberg Group (geology)
1708:Huntley Mountain Formation
1172:Johnstone Limestone Member
1028:Woods Run Limestone Member
910:Cedarville Sanstone Member
905:Sewickley Limestone Member
853:Uniontown Limestone Member
688:Jollytown Limestone Member
310:filled with hydrocarbons.
235:, which lies north of the
138:Southeastern United States
5291:Categories for discussion
5279:
5232:
5223:
5214:
5205:
5105:
5096:
5087:
5044:
5035:
5004:
4983:
4974:
4923:
4890:
4867:
4858:
4849:
4818:
4780:
4771:
4744:
4711:
4702:
4680:
4657:
4648:
4620:
4611:
4585:
4567:
4544:
4535:
4493:
4470:
4461:
4409:
4371:
4362:
4353:
4307:
4289:
4256:
4247:
4210:
4192:
4174:
4156:
4147:
4138:
4112:
4103:
4094:
4083:
4067:
4056:
4036:
4025:
4014:
4003:
3933:
3924:
3915:
3824:
3777:
3759:
3591:
3582:
3551:
3523:
3514:
3492:
3469:
3460:
3428:
3400:
3391:
3363:
3354:
3308:
3280:
3257:
3248:
3211:
3188:
3179:
3142:
3099:
3090:
3081:
3060:
3032:
2984:
2938:
2929:
2883:
2845:
2836:
2827:
2816:
2805:
2745:
2682:
2673:
2639:
2630:
2572:
2526:
2433:
2424:
2363:
2299:
2290:
2255:
2224:
2215:
2171:
2162:
2120:
2102:
2066:
2057:
1972:
1918:
1909:
1751:
1566:
1557:
1548:
1481:
1459:
1400:
1391:
1314:Connoquenessing Formation
1298:
1251:Homewood Sandstone Member
1147:Freeport Sandstone Member
1094:
937:
837:Uniontown Sanstone Member
740:
731:
722:
574:
565:
554:
543:
454:Cecil, C. Blaine (2004).
186:
176:
171:
153:
143:
129:
124:
102:
92:
87:
77:
59:
51:
41:
26:
21:
3338:Wildcat Valley Sandstone
3300:Wildcat Valley Sandstone
1215:Vanport Limestone Member
1043:Buffalo Sandstone Member
781:Middle Waynesburg Member
5169:Conococheague Formation
3844:Conococheague Limestone
3014:Little Valley Formation
2714:Pleasent Hill Formation
1131:Butler Sandstone Member
921:Westone Sanstone Member
822:Gilboy Sandstone Member
791:Lower Waynesburg Member
766:Upper Waynesburg Member
5501:Devonian West Virginia
5375:in West Virginia is a
5315:-related article is a
4731:Williamsport Formation
4635:Bass Islands Formation
3807:Rockdale Run Formation
3676:Lincolnshire Formation
3621:Chatham Hill Formation
2908:Warren Point Formation
2181:Bass Islands Formation
1241:Beaver River Formation
1177:Middle Kittanning Coal
842:Annabelle Shale Member
827:Little Waynesburg Coal
771:Little Washington Coal
323:glauconitic sandstones
247:. to the west and the
202:Huntersville Formation
5491:Devonian Pennsylvania
5287:this template's entry
5122:Copper Ridge Dolomite
5053:Wells Creek Formation
4956:Martinsburg Formation
4951:Dolly Ridge Formation
4726:Wills Creek Formation
4166:Monongahela Formation
3849:Copper Ridge Dolomite
3721:Rich Valley Formation
3681:Martinsburg Formation
3561:Massanutten Sandstone
3533:Massanutten Sandstone
2536:Wells Creek Formation
2501:Linden Hall Formation
2346:Goat Island Formation
1952:Skaneateles Formation
1901:Murrysville Sandstone
1511:"Big Injun Sandstone"
1183:Lower Kittanning Coal
1167:Upper Kittanning Coal
1018:Upper Bakerstown coal
915:Redstone-Pomeroy coal
659:Upper Washington Coal
403:Weed, E.G.A. (1982).
5189:Waynesboro Formation
5066:Beekmantown Dolomite
4910:Reedsville Formation
4429:West Falls Formation
4235:Pocahontas Formation
3894:Waynesboro Formation
3812:Stonehenge Limestone
3787:Chepultepec Dolomite
3716:Reedsville Formation
3696:New Market Limestone
3438:Bloomsburg Formation
3410:Bloomsburg Formation
3198:Mahantango Formation
2999:Fort Payne Formation
2957:Cove Creek Formation
2719:Waynesboro Formation
2660:Gatesburgh Formation
2616:Stonehenge Formation
2562:Bellefonte Formation
2519:Loyalsburg Formation
2448:Reedsville Formation
2084:Bois Blanc Formation
1964:Mahantango Formation
1791:Lock Haven Formation
1772:Sherman Creek Member
1736:Sherman Creek Member
1581:Lock Haven Formation
1473:Loyalhanna Formation
1469:Greenbrier Limestone
1336:Quakertown Fire Clay
1156:Kittanning Formation
978:Connellsville Member
926:Pittsburgh coal seam
884:Upper Sewickley Coal
869:Pittsburgh Formation
756:Waynesburg Formation
673:Washington Formation
645:Prosperity Limestone
635:Claysville Limestone
630:Fish Creek Sandstone
460:USGS Numbered Series
437:Southeastern Geology
334:Bobs Ridge Sandstone
5253:Swift Run Formation
5027:St. Peter Sandstone
4933:Lexington Limestone
4828:Tuscarora Sandstone
4805:Rose Hill Formation
4672:Tonoloway Formation
4281:Bluefield Formation
4271:Princeton Sandstone
4266:Bluestone Formation
4230:New River Formation
4202:Allegheny Formation
3943:Swift Run Formation
3839:Conasauga Formation
3792:Kingsport Formation
3736:Ward Cove Limestone
3651:Five Oaks Limestone
3636:Eggleston Formation
3611:Blackford Formation
3566:Tuscarora Sandstone
3543:Tuscarora Sandstone
3538:Rose Hill Formation
3383:Tonoloway Limestone
3157:Foreknobs Formation
3124:Hampshire Formation
3114:Foreknobs Formation
3009:Hillsdale Formation
2977:Stony Gap Formation
2972:Princeton Formation
2952:Bluestone Formation
2947:Bluefield Formation
2875:Pikeville Formation
2443:Queenston Formation
2410:Tuscarora Formation
2389:Rose Hill Formation
1993:Marcellus Formation
1777:Irish Valley Member
1741:Irish Valley Member
1713:Hampshire Formation
1622:Chadakoin Formation
1601:Cussewago Formation
1586:Riceville Formation
1448:Bluefield Formation
1433:Princeton Formation
1428:Bluestone Formation
1366:Sharon Shale Member
1136:Lower Freeport Coal
1120:Upper Freeport Coal
1013:Pittsburgh Red Beds
953:Casselman Formation
859:Fulton Shale Member
806:Uniontown Formation
600:Windy Gap Limestone
469:10.3133/ofr20041098
28:Stratigraphic range
5241:Catoctin Formation
5154:Weverton Formation
5144:Antietam Formation
5071:Rose Run Sandstone
4961:Nealmont Limestone
4795:McKenzie Formation
4759:McKenzie Formation
4736:McKenzie Formation
4577:Oriskany Sandstone
4559:Huntersville Chert
4523:Huntersville Chert
4513:Onondaga Limestone
4419:Brallier Formation
4401:Brallier Formation
4327:Maccrady Formation
4322:Cuyahoga Formation
4074:Igneous intrusives
4043:Igneous intrusives
3993:Chronostratigraphy
3899:Weverton Formation
3834:Antietam Formation
3797:Longview Limestone
3726:Rockdell Formation
3686:Moccasin Formation
3626:Edinburg Formation
3420:McKenzie Formation
3333:Ridgeley Sandstone
3328:Oriskany Sandstone
3295:Ridgeley Sandstone
3290:Oriskany Sandstone
3267:Huntersville Chert
3221:Huntersville Chert
3152:Brallier Formation
3119:Cloyd Conglomerate
3109:Brallier Formation
3042:Maccrady Formation
3019:Maccrady Formation
2903:Sewannee Formation
2893:Bee Rock Formation
2795:Chronostratigraphy
2729:Antietam Formation
2724:Tomstown Formation
2276:Syracuse Formation
2245:Camillus Formation
2089:Oriskany Formation
2076:Huntersville Chert
2029:Huntersville Chert
2002:Onondaga Limestone
1896:Knapp Conglomerate
1872:Penn Yan Formation
1786:Brallier Formation
1703:Rockwell Formation
1576:Brallier Formation
1532:Rockwell Formation
1491:Cuyahoga Formation
1410:Shenango Formation
1110:Freeport Formation
1057:Mahoning Formation
997:Glenshaw Formation
786:Waynesburg“A” coal
776:Waynesburg“B” coal
533:Chronostratigraphy
414:. 1529-H: 131–133.
325:rich in shells of
257:chronostratigraphy
245:Onondaga Limestone
225:Oriskany Sandstone
209:geologic formation
198:Huntersville Chert
82:Oriskany Formation
68:Onondaga Limestone
22:Huntersville Chert
5448:
5447:
5388:
5387:
5328:
5327:
5274:
5273:
5270:
5269:
5266:
5265:
5258:Grenville Complex
5248:
5247:
5201:
5200:
5197:
5196:
5184:Tomstown Dolomite
5174:Elbrook Formation
5158:Loudoun Formation
5149:Harpers Formation
5134:
5133:
5130:
5129:
5083:
5082:
5079:
5078:
5022:
5021:
4997:Black River Group
4992:Trenton Limestone
4946:
4945:
4938:Trenton Limestone
4905:Juniata Formation
4882:Juniata Formation
4845:
4844:
4841:
4840:
4833:Clinton Sandstone
4790:Lockport Dolomite
4767:
4766:
4754:Lockport Dolomite
4698:
4697:
4607:
4606:
4603:
4602:
4531:
4530:
4457:
4456:
4449:Genesee Formation
4349:
4348:
4345:
4344:
4243:
4242:
4225:Kanawha Formation
4134:
4133:
4130:
4129:
4079:
4078:
4052:
4051:
4048:
4047:
3959:
3958:
3955:
3954:
3951:
3950:
3911:
3910:
3907:
3906:
3884:Tomstown Dolomite
3869:Harpers Formation
3864:Hampton Formation
3854:Elbrook Formation
3820:
3819:
3741:Wardell Formation
3731:Trenton Limestone
3691:Mosheim Limestone
3661:Juniata Formation
3656:Gratton Formation
3606:Benbolt Formation
3578:
3577:
3574:
3573:
3510:
3509:
3456:
3455:
3448:Lockport Dolomite
3350:
3349:
3346:
3345:
3244:
3243:
3175:
3174:
3077:
3076:
3073:
3072:
3024:Taggard Formation
2916:
2915:
2761:
2760:
2754:Grenville Complex
2741:
2740:
2737:
2736:
2709:Potsdam Formation
2704:
2703:
2700:
2699:
2692:Kinzers Formation
2665:Warrior Formation
2626:
2625:
2611:Nittany Formation
2595:Beekmantown Group
2550:Beekmantown Group
2490:Black River Group
2420:
2419:
2359:
2358:
2350:Gasport Formation
2341:Eramosa Formation
2286:
2285:
2158:
2157:
2154:
2153:
2144:Manlius Limestone
2053:
2052:
1957:Tichnor Formation
1891:
1890:
1814:Rhinestreet Shale
1684:Chagrin Formation
1544:
1543:
1540:
1539:
1509:Burgoon Formation
1417:Mauch Chunk Group
1387:
1386:
1287:Lower Mercer Coal
1277:Upper Mercer Coal
1226:Brookville Member
1198:Clarian Formation
988:Birmingham Member
983:Morgantown Member
879:Benwood Limestone
800:Monongahela Group
718:
717:
625:Nineveh Limestone
615:Nineveh Sandstone
610:Gilmore Sandstone
274:and southwestern
253:Onesquethaw Stage
194:
193:
5528:
5469:
5462:
5455:
5424:
5417:
5409:
5402:
5395:
5364:
5357:
5349:
5342:
5335:
5307:
5300:
5230:
5229:
5221:
5220:
5212:
5211:
5103:
5102:
5094:
5093:
5042:
5041:
4981:
4980:
4966:Oswego Formation
4900:Cincinnati Group
4877:Cincinnati Group
4865:
4864:
4856:
4855:
4800:Keefer Formation
4778:
4777:
4709:
4708:
4655:
4654:
4640:Keyser Formation
4630:Bertie Formation
4618:
4617:
4595:Helderberg Group
4542:
4541:
4468:
4467:
4439:Sonyea Formation
4369:
4368:
4360:
4359:
4299:Greenbrier Group
4276:Hinton Formation
4254:
4253:
4220:Pottsville Group
4154:
4153:
4145:
4144:
4110:
4109:
4101:
4100:
4092:
4091:
4087:
4065:
4064:
4060:
4034:
4033:
4029:
4023:
4022:
4018:
4012:
4011:
4007:
3986:
3979:
3972:
3963:
3962:
3931:
3930:
3922:
3921:
3889:Unicoi Formation
3751:Witten Formation
3746:Wassum Formation
3711:Paperville Shale
3706:Oswego Formation
3701:Oranda Formation
3671:Lenoir Formation
3646:Fetzer Limestone
3589:
3588:
3521:
3520:
3502:Keefer Sandstone
3479:Keefer Sandstone
3467:
3466:
3443:Keefer Sandstone
3415:Keefer Sandstone
3398:
3397:
3378:Keyser Limestone
3373:Hancock Dolomite
3361:
3360:
3323:Keyser Limestone
3318:Helderberg Group
3255:
3254:
3226:Tioga Bentonites
3186:
3185:
3097:
3096:
3088:
3087:
3065:Pocono Formation
3004:Gasper Formation
2994:Denmar Formation
2967:Hinton Formation
2936:
2935:
2860:Grundy Formation
2843:
2842:
2834:
2833:
2825:
2824:
2820:
2814:
2813:
2809:
2788:
2781:
2774:
2765:
2764:
2680:
2679:
2637:
2636:
2606:Axeman Formation
2511:Hatter Formation
2506:Snyder Formation
2481:Rodman Formation
2476:Salona Formation
2471:Coburn Formation
2431:
2430:
2337:Guelph Formation
2320:Vernon Formation
2297:
2296:
2222:
2221:
2205:Bertie Formation
2169:
2168:
2139:Keyser Formation
2064:
2063:
1947:Ludlow Formation
1942:Moscow Formation
1916:
1915:
1867:West River Shale
1809:Angola Formation
1798:West Falls Group
1731:Duncannon Member
1591:Oswayo Formation
1564:
1563:
1555:
1554:
1443:Maxton Sandstone
1438:Hinton Formation
1398:
1397:
1377:Sharon Sandstone
1355:Sharon Formation
1341:Quakertown Shale
1308:Pottsville Group
1261:Mercer Formation
1235:Pottsville Group
738:
737:
729:
728:
655:Donley Limestone
590:Greene Formation
572:
571:
563:
562:
558:
552:
551:
547:
526:
519:
512:
503:
502:
498:
496:
494:
489:on 25 March 2022
485:. Archived from
474:
473:
471:
451:
445:
444:
434:
425:
416:
415:
409:
400:
387:
386:
380:
371:
72:Tioga Bentonites
19:
18:
5536:
5535:
5531:
5530:
5529:
5527:
5526:
5525:
5476:
5475:
5474:
5473:
5414:
5413:
5354:
5353:
5297:
5294:
5277:
5275:
5262:
5244:
5193:
5164:Conasauga Group
5139:Chilhowee Group
5126:
5075:
5031:
5018:
5000:
4970:
4942:
4919:
4886:
4837:
4814:
4810:Rochester Shale
4763:
4740:
4694:
4676:
4644:
4599:
4581:
4563:
4527:
4508:Marcellus Shale
4489:
4480:Tully Limestone
4453:
4405:
4386:Berea Sandstone
4381:Price Formation
4341:
4337:Berea Sandstone
4317:Price Formation
4303:
4285:
4239:
4206:
4188:
4184:Conemaugh Group
4170:
4126:
4085:
4075:
4058:
4044:
4027:
4016:
4005:
3999:
3990:
3960:
3947:
3903:
3859:Erwin Formation
3816:
3802:Mascot Dolomite
3773:
3755:
3666:Knobs Formation
3641:Elway Limestone
3631:Effna Limestone
3616:Bowen Formation
3570:
3547:
3506:
3488:
3484:Rochester Shale
3452:
3424:
3387:
3342:
3304:
3276:
3240:
3231:Marcellus Shale
3207:
3171:
3167:Pound Formation
3138:
3134:Pound Formation
3069:
3056:
3047:Price Formation
3028:
2980:
2925:
2912:
2879:
2865:Hyden Formation
2818:
2807:
2801:
2792:
2762:
2757:
2733:
2696:
2669:
2651:Knox Supergroup
2622:
2582:Knox Supergroup
2568:
2545:Knox Supergroup
2522:
2416:
2384:Rochester Shale
2355:
2282:
2251:
2211:
2188:
2186:Akron Formation
2150:
2116:
2098:
2049:
1968:
1926:Tully Limestone
1905:
1887:
1839:Middlesex Shale
1747:
1679:Cleveland Shale
1536:
1520:Berea Sandstone
1477:
1455:
1383:
1330:Quakertown Coal
1326:"2nd Salt Sand"
1312:
1294:
1253:"1st Salt Sand"
1239:
1220:Brookville Coal
1108:
1104:Allegheny Group
1090:
1068:Bush Creek Coal
951:
947:Conemaugh Group
933:
867:
816:Waynesburg coal
804:
754:
714:
703:Washington Coal
671:
663:Rockport Member
588:
556:
545:
539:
530:
492:
490:
477:
452:
448:
432:
426:
419:
407:
401:
390:
378:
372:
361:
357:
349:Marcellus Shale
345:Tioga Bentonite
308:sponge spicules
255:of Appalachian
64:Marcellus Shale
17:
12:
11:
5:
5534:
5524:
5523:
5521:Devonian stubs
5518:
5513:
5508:
5503:
5498:
5493:
5488:
5472:
5471:
5464:
5457:
5449:
5446:
5445:
5425:
5412:
5411:
5404:
5397:
5389:
5386:
5385:
5365:
5352:
5351:
5344:
5337:
5329:
5326:
5325:
5308:
5272:
5271:
5268:
5267:
5264:
5263:
5261:
5260:
5255:
5249:
5246:
5245:
5243:
5238:
5236:
5227:
5218:
5209:
5203:
5202:
5199:
5198:
5195:
5194:
5192:
5191:
5186:
5181:
5176:
5171:
5166:
5160:
5159:
5156:
5151:
5146:
5141:
5135:
5132:
5131:
5128:
5127:
5125:
5124:
5118:
5117:
5111:
5109:
5100:
5091:
5085:
5084:
5081:
5080:
5077:
5076:
5074:
5073:
5068:
5062:
5061:
5055:
5050:
5048:
5039:
5033:
5032:
5030:
5029:
5023:
5020:
5019:
5017:
5016:
5014:St. Paul Group
5010:
5008:
5002:
5001:
4999:
4994:
4989:
4987:
4978:
4972:
4971:
4969:
4968:
4963:
4958:
4953:
4947:
4944:
4943:
4941:
4940:
4935:
4929:
4927:
4921:
4920:
4918:
4917:
4912:
4907:
4902:
4896:
4894:
4888:
4887:
4885:
4884:
4879:
4873:
4871:
4862:
4853:
4847:
4846:
4843:
4842:
4839:
4838:
4836:
4835:
4830:
4824:
4822:
4816:
4815:
4813:
4812:
4807:
4802:
4797:
4792:
4786:
4784:
4775:
4769:
4768:
4765:
4764:
4762:
4761:
4756:
4750:
4748:
4742:
4741:
4739:
4738:
4733:
4728:
4723:
4717:
4715:
4706:
4700:
4699:
4696:
4695:
4693:
4692:
4686:
4684:
4678:
4677:
4675:
4674:
4669:
4663:
4661:
4652:
4646:
4645:
4643:
4642:
4637:
4632:
4626:
4624:
4615:
4609:
4608:
4605:
4604:
4601:
4600:
4598:
4597:
4591:
4589:
4583:
4582:
4580:
4579:
4573:
4571:
4565:
4564:
4562:
4561:
4556:
4554:Needmore Shale
4550:
4548:
4539:
4533:
4532:
4529:
4528:
4526:
4525:
4520:
4518:Needmore Shale
4515:
4510:
4505:
4503:Hamilton Group
4499:
4497:
4491:
4490:
4488:
4487:
4485:Hamilton Group
4482:
4476:
4474:
4465:
4459:
4458:
4455:
4454:
4452:
4451:
4446:
4441:
4436:
4431:
4426:
4424:Java Formation
4421:
4415:
4413:
4407:
4406:
4404:
4403:
4398:
4393:
4388:
4383:
4377:
4375:
4366:
4357:
4351:
4350:
4347:
4346:
4343:
4342:
4340:
4339:
4334:
4329:
4324:
4319:
4313:
4311:
4305:
4304:
4302:
4301:
4295:
4293:
4287:
4286:
4284:
4283:
4278:
4273:
4268:
4262:
4260:
4251:
4245:
4244:
4241:
4240:
4238:
4237:
4232:
4227:
4222:
4216:
4214:
4208:
4207:
4205:
4204:
4198:
4196:
4190:
4189:
4187:
4186:
4180:
4178:
4172:
4171:
4169:
4168:
4162:
4160:
4151:
4142:
4136:
4135:
4132:
4131:
4128:
4127:
4125:
4124:
4118:
4116:
4107:
4098:
4089:
4081:
4080:
4077:
4076:
4073:
4071:
4062:
4054:
4053:
4050:
4049:
4046:
4045:
4042:
4040:
4031:
4020:
4009:
4001:
4000:
3989:
3988:
3981:
3974:
3966:
3957:
3956:
3953:
3952:
3949:
3948:
3946:
3945:
3939:
3937:
3928:
3919:
3913:
3912:
3909:
3908:
3905:
3904:
3902:
3901:
3896:
3891:
3886:
3881:
3879:Shady Dolomite
3876:
3874:Rome Formation
3871:
3866:
3861:
3856:
3851:
3846:
3841:
3836:
3830:
3828:
3822:
3821:
3818:
3817:
3815:
3814:
3809:
3804:
3799:
3794:
3789:
3783:
3781:
3775:
3774:
3772:
3771:
3765:
3763:
3757:
3756:
3754:
3753:
3748:
3743:
3738:
3733:
3728:
3723:
3718:
3713:
3708:
3703:
3698:
3693:
3688:
3683:
3678:
3673:
3668:
3663:
3658:
3653:
3648:
3643:
3638:
3633:
3628:
3623:
3618:
3613:
3608:
3603:
3601:Bays Formation
3597:
3595:
3586:
3580:
3579:
3576:
3575:
3572:
3571:
3569:
3568:
3563:
3557:
3555:
3549:
3548:
3546:
3545:
3540:
3535:
3529:
3527:
3518:
3512:
3511:
3508:
3507:
3505:
3504:
3498:
3496:
3490:
3489:
3487:
3486:
3481:
3475:
3473:
3464:
3458:
3457:
3454:
3453:
3451:
3450:
3445:
3440:
3434:
3432:
3426:
3425:
3423:
3422:
3417:
3412:
3406:
3404:
3395:
3389:
3388:
3386:
3385:
3380:
3375:
3369:
3367:
3358:
3352:
3351:
3348:
3347:
3344:
3343:
3341:
3340:
3335:
3330:
3325:
3320:
3314:
3312:
3306:
3305:
3303:
3302:
3297:
3292:
3286:
3284:
3278:
3277:
3275:
3274:
3272:Needmore Shale
3269:
3263:
3261:
3252:
3246:
3245:
3242:
3241:
3239:
3238:
3236:Millboro Shale
3233:
3228:
3223:
3217:
3215:
3209:
3208:
3206:
3205:
3203:Millboro Shale
3200:
3194:
3192:
3183:
3177:
3176:
3173:
3172:
3170:
3169:
3164:
3162:Millboro Shale
3159:
3154:
3148:
3146:
3140:
3139:
3137:
3136:
3131:
3129:Millboro Shale
3126:
3121:
3116:
3111:
3105:
3103:
3094:
3085:
3079:
3078:
3075:
3074:
3071:
3070:
3068:
3067:
3061:
3058:
3057:
3055:
3054:
3049:
3044:
3038:
3036:
3030:
3029:
3027:
3026:
3021:
3016:
3011:
3006:
3001:
2996:
2990:
2988:
2982:
2981:
2979:
2974:
2969:
2964:
2962:Fido Sandstone
2959:
2954:
2949:
2944:
2942:
2933:
2927:
2926:
2924:
2923:
2917:
2914:
2913:
2911:
2910:
2905:
2900:
2895:
2889:
2887:
2881:
2880:
2878:
2877:
2872:
2870:Kendrick Shale
2867:
2862:
2857:
2851:
2849:
2840:
2831:
2822:
2811:
2803:
2802:
2791:
2790:
2783:
2776:
2768:
2759:
2758:
2756:
2751:
2749:
2743:
2742:
2739:
2738:
2735:
2734:
2732:
2731:
2726:
2721:
2716:
2711:
2705:
2702:
2701:
2698:
2697:
2695:
2694:
2688:
2686:
2677:
2671:
2670:
2668:
2667:
2662:
2656:
2655:
2654:
2653:
2645:
2643:
2634:
2628:
2627:
2624:
2623:
2621:
2620:
2619:
2618:
2613:
2608:
2600:
2599:
2597:
2591:
2590:
2589:
2588:
2584:
2578:
2576:
2570:
2569:
2567:
2566:
2565:
2564:
2556:
2555:
2554:
2553:
2547:
2539:
2538:
2532:
2530:
2524:
2523:
2516:
2515:
2514:
2513:
2508:
2503:
2495:
2494:
2492:
2486:
2485:
2484:
2483:
2478:
2473:
2465:
2464:
2462:
2456:
2455:
2450:
2445:
2439:
2437:
2428:
2422:
2421:
2418:
2417:
2415:
2414:
2413:
2412:
2404:
2403:
2401:
2395:
2394:
2393:
2392:
2386:
2378:
2377:
2375:
2369:
2367:
2361:
2360:
2357:
2356:
2354:
2353:
2352:
2351:
2348:
2343:
2338:
2332:
2331:
2329:Lockport Group
2325:
2324:
2323:
2322:
2314:
2313:
2311:
2305:
2303:
2294:
2288:
2287:
2284:
2283:
2281:
2280:
2279:
2278:
2270:
2269:
2267:
2261:
2259:
2253:
2252:
2250:
2249:
2248:
2247:
2239:
2238:
2236:
2230:
2228:
2219:
2213:
2212:
2210:
2209:
2208:
2207:
2199:
2198:
2196:
2190:
2189:
2183:
2177:
2175:
2166:
2160:
2159:
2156:
2155:
2152:
2151:
2149:
2148:
2147:
2146:
2141:
2133:
2132:
2126:
2124:
2118:
2117:
2115:
2114:
2108:
2106:
2100:
2099:
2097:
2096:
2091:
2086:
2080:Needmore Shale
2072:
2070:
2061:
2055:
2054:
2051:
2050:
2048:
2047:
2045:Needmore Shale
2042:
2041:
2040:
2034:
2033:
2032:
2031:
2023:
2022:
2021:
2020:
2017:
2014:
2011:
2005:
2004:
1998:
1997:
1996:
1995:
1987:
1986:
1984:
1982:Hamilton Group
1978:
1976:
1970:
1969:
1967:
1966:
1961:
1960:
1959:
1954:
1949:
1944:
1936:
1935:
1933:
1931:Hamilton Group
1924:
1922:
1913:
1907:
1906:
1904:
1903:
1898:
1892:
1889:
1888:
1886:
1885:
1884:
1883:
1874:
1869:
1861:
1860:
1859:
1858:
1854:
1844:
1843:
1842:
1841:
1836:
1834:Cashaqua Shale
1828:
1827:
1825:
1819:
1818:
1817:
1816:
1811:
1803:
1802:
1800:
1794:
1793:
1788:
1782:
1781:
1780:
1779:
1774:
1766:
1765:
1763:
1761:Catskill Group
1757:
1755:
1749:
1748:
1746:
1745:
1744:
1743:
1738:
1733:
1725:
1724:
1722:
1720:Catskill Group
1716:
1715:
1710:
1705:
1700:
1698:Java Formation
1694:
1693:
1692:
1691:
1686:
1681:
1673:
1672:
1670:
1664:
1663:
1662:
1661:
1655:
1654:
1652:
1646:
1645:
1644:
1643:
1637:
1636:
1634:
1632:Bradford Group
1628:
1627:
1626:
1625:
1624:, First Warren
1619:
1613:
1612:
1610:
1604:
1603:
1598:
1593:
1588:
1583:
1578:
1572:
1570:
1561:
1552:
1546:
1545:
1542:
1541:
1538:
1537:
1535:
1534:
1529:
1528:
1527:
1522:
1517:
1512:
1503:
1502:
1500:
1494:
1493:
1487:
1485:
1479:
1478:
1476:
1475:
1465:
1463:
1457:
1456:
1454:
1453:
1452:
1451:
1445:
1440:
1435:
1430:
1422:
1421:
1419:
1413:
1412:
1406:
1404:
1395:
1389:
1388:
1385:
1384:
1382:
1381:
1380:
1379:
1374:
1368:
1360:
1359:
1357:
1351:
1350:
1349:
1348:
1343:
1338:
1333:
1327:
1318:
1317:
1310:
1304:
1302:
1296:
1295:
1293:
1292:
1291:
1290:
1284:
1279:
1274:
1266:
1265:
1263:
1257:
1256:
1255:
1254:
1245:
1244:
1237:
1231:
1230:
1229:
1228:
1223:
1217:
1212:
1203:
1202:
1200:
1194:
1193:
1192:
1191:
1186:
1180:
1174:
1169:
1161:
1160:
1158:
1152:
1151:
1150:
1149:
1144:
1139:
1133:
1128:
1123:
1114:
1113:
1106:
1100:
1098:
1092:
1091:
1089:
1088:
1087:
1086:
1081:
1075:
1070:
1062:
1061:
1059:
1053:
1052:
1051:
1050:
1045:
1040:
1035:
1030:
1025:
1020:
1015:
1010:
1008:Ames Limestone
1002:
1001:
999:
993:
992:
991:
990:
985:
980:
975:
970:
965:
957:
956:
949:
943:
941:
935:
934:
932:
931:
930:
929:
923:
918:
912:
907:
902:
897:
894:Sewickley Coal
891:
886:
881:
873:
872:
864:
863:
862:
861:
856:
850:
847:Uniontown Coal
844:
839:
834:
829:
824:
819:
810:
809:
802:
796:
795:
794:
793:
788:
783:
778:
773:
768:
760:
759:
752:
746:
744:
735:
726:
720:
719:
716:
715:
713:
712:
711:
710:
705:
700:
695:
693:Jollytown Coal
690:
685:
677:
676:
668:
667:
666:
665:
660:
657:
652:
647:
642:
637:
632:
627:
622:
617:
612:
607:
605:Windy Gap Coal
602:
594:
593:
586:
580:
578:
569:
560:
549:
541:
540:
529:
528:
521:
514:
506:
500:
499:
476:
475:
446:
417:
388:
358:
356:
353:
249:Needmore Shale
233:Needmore Shale
215:region of the
192:
191:
188:
184:
183:
178:
174:
173:
169:
168:
155:
151:
150:
145:
141:
140:
131:
127:
126:
122:
121:
104:
100:
99:
94:
90:
89:
85:
84:
79:
75:
74:
61:
57:
56:
53:
49:
48:
43:
39:
38:
24:
23:
15:
9:
6:
4:
3:
2:
5533:
5522:
5519:
5517:
5514:
5512:
5509:
5507:
5504:
5502:
5499:
5497:
5494:
5492:
5489:
5487:
5484:
5483:
5481:
5470:
5465:
5463:
5458:
5456:
5451:
5450:
5444:
5442:
5438:
5434:
5431:
5426:
5423:
5419:
5418:
5410:
5405:
5403:
5398:
5396:
5391:
5390:
5384:
5382:
5378:
5374:
5371:
5370:stratigraphic
5366:
5363:
5359:
5358:
5350:
5345:
5343:
5338:
5336:
5331:
5330:
5324:
5322:
5318:
5314:
5309:
5306:
5302:
5301:
5295:
5292:
5288:
5284:
5283:stub template
5278:
5259:
5256:
5254:
5251:
5250:
5242:
5239:
5237:
5235:
5231:
5228:
5226:
5222:
5219:
5217:
5213:
5210:
5208:
5204:
5190:
5187:
5185:
5182:
5180:
5177:
5175:
5172:
5170:
5167:
5165:
5162:
5161:
5157:
5155:
5152:
5150:
5147:
5145:
5142:
5140:
5137:
5136:
5123:
5120:
5119:
5116:
5113:
5112:
5110:
5108:
5104:
5101:
5099:
5095:
5092:
5090:
5086:
5072:
5069:
5067:
5064:
5063:
5060:
5057:
5056:
5054:
5051:
5049:
5047:
5043:
5040:
5038:
5034:
5028:
5025:
5024:
5015:
5012:
5011:
5009:
5007:
5003:
4998:
4995:
4993:
4990:
4988:
4986:
4982:
4979:
4977:
4973:
4967:
4964:
4962:
4959:
4957:
4954:
4952:
4949:
4948:
4939:
4936:
4934:
4931:
4930:
4928:
4926:
4922:
4916:
4913:
4911:
4908:
4906:
4903:
4901:
4898:
4897:
4895:
4893:
4889:
4883:
4880:
4878:
4875:
4874:
4872:
4870:
4866:
4863:
4861:
4857:
4854:
4852:
4848:
4834:
4831:
4829:
4826:
4825:
4823:
4821:
4817:
4811:
4808:
4806:
4803:
4801:
4798:
4796:
4793:
4791:
4788:
4787:
4785:
4783:
4779:
4776:
4774:
4770:
4760:
4757:
4755:
4752:
4751:
4749:
4747:
4743:
4737:
4734:
4732:
4729:
4727:
4724:
4722:
4719:
4718:
4716:
4714:
4710:
4707:
4705:
4701:
4691:
4688:
4687:
4685:
4683:
4679:
4673:
4670:
4668:
4665:
4664:
4662:
4660:
4656:
4653:
4651:
4647:
4641:
4638:
4636:
4633:
4631:
4628:
4627:
4625:
4623:
4619:
4616:
4614:
4610:
4596:
4593:
4592:
4590:
4588:
4584:
4578:
4575:
4574:
4572:
4570:
4566:
4560:
4557:
4555:
4552:
4551:
4549:
4547:
4543:
4540:
4538:
4534:
4524:
4521:
4519:
4516:
4514:
4511:
4509:
4506:
4504:
4501:
4500:
4498:
4496:
4492:
4486:
4483:
4481:
4478:
4477:
4475:
4473:
4469:
4466:
4464:
4460:
4450:
4447:
4445:
4444:Harrell Shale
4442:
4440:
4437:
4435:
4432:
4430:
4427:
4425:
4422:
4420:
4417:
4416:
4414:
4412:
4408:
4402:
4399:
4397:
4394:
4392:
4391:Bedford Shale
4389:
4387:
4384:
4382:
4379:
4378:
4376:
4374:
4370:
4367:
4365:
4361:
4358:
4356:
4352:
4338:
4335:
4333:
4332:Sunbury Shale
4330:
4328:
4325:
4323:
4320:
4318:
4315:
4314:
4312:
4310:
4306:
4300:
4297:
4296:
4294:
4292:
4288:
4282:
4279:
4277:
4274:
4272:
4269:
4267:
4264:
4263:
4261:
4259:
4255:
4252:
4250:
4246:
4236:
4233:
4231:
4228:
4226:
4223:
4221:
4218:
4217:
4215:
4213:
4209:
4203:
4200:
4199:
4197:
4195:
4191:
4185:
4182:
4181:
4179:
4177:
4173:
4167:
4164:
4163:
4161:
4159:
4155:
4152:
4150:
4146:
4143:
4141:
4137:
4123:
4122:Dunkard Group
4120:
4119:
4117:
4115:
4111:
4108:
4106:
4102:
4099:
4097:
4093:
4090:
4088:
4082:
4072:
4070:
4066:
4063:
4061:
4055:
4041:
4039:
4035:
4032:
4030:
4024:
4021:
4019:
4013:
4010:
4008:
4002:
3998:
3997:West Virginia
3994:
3987:
3982:
3980:
3975:
3973:
3968:
3967:
3964:
3944:
3941:
3940:
3938:
3936:
3932:
3929:
3927:
3923:
3920:
3918:
3914:
3900:
3897:
3895:
3892:
3890:
3887:
3885:
3882:
3880:
3877:
3875:
3872:
3870:
3867:
3865:
3862:
3860:
3857:
3855:
3852:
3850:
3847:
3845:
3842:
3840:
3837:
3835:
3832:
3831:
3829:
3827:
3823:
3813:
3810:
3808:
3805:
3803:
3800:
3798:
3795:
3793:
3790:
3788:
3785:
3784:
3782:
3780:
3776:
3770:
3767:
3766:
3764:
3762:
3758:
3752:
3749:
3747:
3744:
3742:
3739:
3737:
3734:
3732:
3729:
3727:
3724:
3722:
3719:
3717:
3714:
3712:
3709:
3707:
3704:
3702:
3699:
3697:
3694:
3692:
3689:
3687:
3684:
3682:
3679:
3677:
3674:
3672:
3669:
3667:
3664:
3662:
3659:
3657:
3654:
3652:
3649:
3647:
3644:
3642:
3639:
3637:
3634:
3632:
3629:
3627:
3624:
3622:
3619:
3617:
3614:
3612:
3609:
3607:
3604:
3602:
3599:
3598:
3596:
3594:
3590:
3587:
3585:
3581:
3567:
3564:
3562:
3559:
3558:
3556:
3554:
3550:
3544:
3541:
3539:
3536:
3534:
3531:
3530:
3528:
3526:
3522:
3519:
3517:
3513:
3503:
3500:
3499:
3497:
3495:
3491:
3485:
3482:
3480:
3477:
3476:
3474:
3472:
3468:
3465:
3463:
3459:
3449:
3446:
3444:
3441:
3439:
3436:
3435:
3433:
3431:
3427:
3421:
3418:
3416:
3413:
3411:
3408:
3407:
3405:
3403:
3399:
3396:
3394:
3390:
3384:
3381:
3379:
3376:
3374:
3371:
3370:
3368:
3366:
3362:
3359:
3357:
3353:
3339:
3336:
3334:
3331:
3329:
3326:
3324:
3321:
3319:
3316:
3315:
3313:
3311:
3307:
3301:
3298:
3296:
3293:
3291:
3288:
3287:
3285:
3283:
3279:
3273:
3270:
3268:
3265:
3264:
3262:
3260:
3256:
3253:
3251:
3247:
3237:
3234:
3232:
3229:
3227:
3224:
3222:
3219:
3218:
3216:
3214:
3210:
3204:
3201:
3199:
3196:
3195:
3193:
3191:
3187:
3184:
3182:
3178:
3168:
3165:
3163:
3160:
3158:
3155:
3153:
3150:
3149:
3147:
3145:
3141:
3135:
3132:
3130:
3127:
3125:
3122:
3120:
3117:
3115:
3112:
3110:
3107:
3106:
3104:
3102:
3098:
3095:
3093:
3089:
3086:
3084:
3080:
3066:
3063:
3062:
3059:
3053:
3052:Sunbury Shale
3050:
3048:
3045:
3043:
3040:
3039:
3037:
3035:
3031:
3025:
3022:
3020:
3017:
3015:
3012:
3010:
3007:
3005:
3002:
3000:
2997:
2995:
2992:
2991:
2989:
2987:
2983:
2978:
2975:
2973:
2970:
2968:
2965:
2963:
2960:
2958:
2955:
2953:
2950:
2948:
2945:
2943:
2941:
2937:
2934:
2932:
2928:
2922:
2921:Lee Formation
2919:
2918:
2909:
2906:
2904:
2901:
2899:
2898:Hensley Shale
2896:
2894:
2891:
2890:
2888:
2886:
2882:
2876:
2873:
2871:
2868:
2866:
2863:
2861:
2858:
2856:
2853:
2852:
2850:
2848:
2844:
2841:
2839:
2835:
2832:
2830:
2826:
2823:
2821:
2815:
2812:
2810:
2804:
2800:
2796:
2789:
2784:
2782:
2777:
2775:
2770:
2769:
2766:
2755:
2752:
2750:
2748:
2744:
2730:
2727:
2725:
2722:
2720:
2717:
2715:
2712:
2710:
2707:
2706:
2693:
2690:
2689:
2687:
2685:
2681:
2678:
2676:
2672:
2666:
2663:
2661:
2658:
2657:
2652:
2649:
2648:
2647:
2646:
2644:
2642:
2638:
2635:
2633:
2629:
2617:
2614:
2612:
2609:
2607:
2604:
2603:
2602:
2601:
2598:
2596:
2593:
2592:
2587:
2586:
2585:
2583:
2580:
2579:
2577:
2575:
2571:
2563:
2560:
2559:
2558:
2557:
2551:
2548:
2546:
2543:
2542:
2541:
2540:
2537:
2534:
2533:
2531:
2529:
2525:
2521:
2520:
2512:
2509:
2507:
2504:
2502:
2499:
2498:
2497:
2496:
2493:
2491:
2488:
2487:
2482:
2479:
2477:
2474:
2472:
2469:
2468:
2467:
2466:
2463:
2461:
2460:Trenton Group
2458:
2457:
2454:
2451:
2449:
2446:
2444:
2441:
2440:
2438:
2436:
2432:
2429:
2427:
2423:
2411:
2408:
2407:
2406:
2405:
2402:
2400:
2397:
2396:
2391:"Red Clinton"
2390:
2387:
2385:
2382:
2381:
2380:
2379:
2376:
2374:
2373:Clinton Group
2371:
2370:
2368:
2366:
2362:
2349:
2347:
2344:
2342:
2339:
2336:
2335:
2334:
2333:
2330:
2327:
2326:
2321:
2318:
2317:
2316:
2315:
2312:
2310:
2307:
2306:
2304:
2302:
2298:
2295:
2293:
2289:
2277:
2274:
2273:
2272:
2271:
2268:
2266:
2263:
2262:
2260:
2258:
2254:
2246:
2243:
2242:
2241:
2240:
2237:
2235:
2232:
2231:
2229:
2227:
2223:
2220:
2218:
2214:
2206:
2203:
2202:
2201:
2200:
2197:
2195:
2192:
2191:
2187:
2184:
2182:
2179:
2178:
2176:
2174:
2170:
2167:
2165:
2161:
2145:
2142:
2140:
2137:
2136:
2135:
2134:
2131:
2128:
2127:
2125:
2123:
2119:
2113:
2110:
2109:
2107:
2105:
2101:
2095:
2092:
2090:
2087:
2085:
2081:
2077:
2074:
2073:
2071:
2069:
2065:
2062:
2060:
2056:
2046:
2043:
2038:
2037:
2036:
2035:
2030:
2027:
2026:
2025:
2024:
2018:
2015:
2012:
2009:
2008:
2007:
2006:
2003:
2000:
1999:
1994:
1991:
1990:
1989:
1988:
1985:
1983:
1980:
1979:
1977:
1975:
1971:
1965:
1962:
1958:
1955:
1953:
1950:
1948:
1945:
1943:
1940:
1939:
1938:
1937:
1934:
1932:
1929:
1928:
1927:
1923:
1921:
1917:
1914:
1912:
1908:
1902:
1899:
1897:
1894:
1893:
1882:
1881:Geneseo Shale
1878:
1875:
1873:
1870:
1868:
1865:
1864:
1863:
1862:
1857:
1856:
1855:
1853:
1852:Harrell Shale
1849:
1848:Genesee Group
1846:
1845:
1840:
1837:
1835:
1832:
1831:
1830:
1829:
1826:
1824:
1821:
1820:
1815:
1812:
1810:
1807:
1806:
1805:
1804:
1801:
1799:
1796:
1795:
1792:
1789:
1787:
1784:
1783:
1778:
1775:
1773:
1770:
1769:
1768:
1767:
1764:
1762:
1759:
1758:
1756:
1754:
1750:
1742:
1739:
1737:
1734:
1732:
1729:
1728:
1727:
1726:
1723:
1721:
1718:
1717:
1714:
1711:
1709:
1706:
1704:
1701:
1699:
1696:
1695:
1690:
1687:
1685:
1682:
1680:
1677:
1676:
1675:
1674:
1671:
1669:
1666:
1665:
1659:
1658:
1657:
1656:
1653:
1651:
1648:
1647:
1641:
1640:
1639:
1638:
1635:
1633:
1630:
1629:
1623:
1620:
1617:
1616:
1615:
1614:
1611:
1609:
1608:Venango Group
1606:
1605:
1602:
1599:
1597:
1596:Bedford Shale
1594:
1592:
1589:
1587:
1584:
1582:
1579:
1577:
1574:
1573:
1571:
1569:
1565:
1562:
1560:
1556:
1553:
1551:
1547:
1533:
1530:
1526:
1525:Bedford Shale
1523:
1521:
1518:
1516:
1515:Sunbury Shale
1513:
1510:
1507:
1506:
1505:
1504:
1501:
1499:
1496:
1495:
1492:
1489:
1488:
1486:
1484:
1480:
1474:
1470:
1467:
1466:
1464:
1462:
1458:
1450:"Little Lime"
1449:
1446:
1444:
1441:
1439:
1436:
1434:
1431:
1429:
1426:
1425:
1424:
1423:
1420:
1418:
1415:
1414:
1411:
1408:
1407:
1405:
1403:
1399:
1396:
1394:
1390:
1378:
1375:
1372:
1369:
1367:
1364:
1363:
1362:
1361:
1358:
1356:
1353:
1352:
1347:
1344:
1342:
1339:
1337:
1334:
1331:
1328:
1325:
1322:
1321:
1320:
1319:
1315:
1311:
1309:
1306:
1305:
1303:
1301:
1297:
1288:
1285:
1283:
1280:
1278:
1275:
1273:
1270:
1269:
1268:
1267:
1264:
1262:
1259:
1258:
1252:
1249:
1248:
1247:
1246:
1242:
1238:
1236:
1233:
1232:
1227:
1224:
1221:
1218:
1216:
1213:
1211:"No. 4a Coal"
1210:
1207:
1206:
1205:
1204:
1201:
1199:
1196:
1195:
1190:
1187:
1184:
1181:
1178:
1175:
1173:
1170:
1168:
1165:
1164:
1163:
1162:
1159:
1157:
1154:
1153:
1148:
1145:
1143:
1140:
1138:"No. 6a Coal"
1137:
1134:
1132:
1129:
1127:
1124:
1121:
1118:
1117:
1116:
1115:
1111:
1107:
1105:
1102:
1101:
1099:
1097:
1093:
1085:
1082:
1080:"No. 7a Coal"
1079:
1078:Mahoning Coal
1076:
1074:
1071:
1069:
1066:
1065:
1064:
1063:
1060:
1058:
1055:
1054:
1049:
1046:
1044:
1041:
1039:
1036:
1034:
1031:
1029:
1026:
1024:
1021:
1019:
1016:
1014:
1011:
1009:
1006:
1005:
1004:
1003:
1000:
998:
995:
994:
989:
986:
984:
981:
979:
976:
974:
971:
969:
966:
964:
961:
960:
959:
958:
954:
950:
948:
945:
944:
942:
940:
936:
927:
924:
922:
919:
917:"No 8a. Coal"
916:
913:
911:
908:
906:
903:
901:
898:
895:
892:
890:
887:
885:
882:
880:
877:
876:
875:
874:
870:
866:
865:
860:
857:
854:
851:
849:"No. 10 Coal"
848:
845:
843:
840:
838:
835:
833:
830:
828:
825:
823:
820:
818:"No. 11 Coal"
817:
814:
813:
812:
811:
807:
803:
801:
798:
797:
792:
789:
787:
784:
782:
779:
777:
774:
772:
769:
767:
764:
763:
762:
761:
757:
753:
751:
750:Dunkard Group
748:
747:
745:
743:
739:
736:
734:
730:
727:
725:
721:
709:
706:
704:
701:
699:
696:
694:
691:
689:
686:
684:
681:
680:
679:
678:
674:
670:
669:
664:
661:
658:
656:
653:
651:
648:
646:
643:
641:
638:
636:
633:
631:
628:
626:
623:
621:
618:
616:
613:
611:
608:
606:
603:
601:
598:
597:
596:
595:
591:
587:
585:
584:Dunkard Group
582:
581:
579:
577:
573:
570:
568:
564:
561:
559:
553:
550:
548:
542:
538:
534:
527:
522:
520:
515:
513:
508:
507:
504:
488:
484:
479:
478:
470:
465:
461:
457:
450:
442:
438:
431:
424:
422:
413:
406:
399:
397:
395:
393:
384:
377:
370:
368:
366:
364:
359:
352:
350:
346:
342:
338:
335:
331:
328:
324:
319:
317:
313:
309:
305:
301:
297:
293:
289:
285:
281:
280:transgression
277:
273:
272:West Virginia
268:
266:
262:
258:
254:
250:
246:
242:
238:
234:
230:
226:
222:
218:
217:United States
214:
210:
207:
203:
199:
189:
185:
182:
179:
175:
170:
167:
166:West Virginia
163:
159:
156:
152:
149:
148:United States
146:
142:
139:
135:
132:
128:
123:
120:
116:
112:
108:
105:
101:
98:
95:
91:
86:
83:
80:
76:
73:
69:
65:
62:
58:
54:
50:
47:
44:
40:
37:
33:
29:
25:
20:
5441:expanding it
5427:
5381:expanding it
5367:
5321:expanding it
5310:
5280:
5276:
4746:Sheinwoodian
4721:Salina Group
4690:Salina Group
4667:Salina Group
4558:
4522:
4258:Serpukhovian
3494:Sheinwoodian
3266:
3220:
2940:Serpukhovian
2855:Betsie Shale
2517:
2399:Medina Group
2309:Salina Group
2265:Salina Group
2234:Salina Group
2194:Salina Group
2075:
2028:
1877:Burket Shale
1823:Sonyea Group
1498:Pocono Group
1402:Serpukhovian
1373:"No. 1 Coal"
1332:"No. 2 Coal"
1289:"No. 3 Coal"
1222:"No. 4 Coal"
1209:Clarian Coal
1185:"No. 5 Coal"
1179:"No. 6 Coal"
1122:"No. 7 Coal"
928:"No. 8 Coal"
855:"Great Lime"
650:Tenmile Coal
640:Dunkard Coal
620:Nineveh Coal
537:Pennsylvania
491:. Retrieved
487:the original
459:
449:
440:
436:
411:
382:
333:
320:
292:argillaceous
269:
229:unconformity
201:
197:
195:
172:Type section
158:Pennsylvania
5281:‹ The
5046:Tremadocian
4985:Darriwilian
4915:Utica Shale
4434:Rhinestreet
4309:Tournaisian
3034:Tournaisian
2453:Utica Shale
1689:Huron Shale
1483:Tournaisian
1471:"Big Lime"
1371:Sharon Coal
493:17 December
443:(1): 37–47.
330:brachiopods
213:Appalachian
190:Price, 1929
5480:Categories
5313:Appalachia
5179:Rome Group
5115:Knox Group
5059:Knox Group
4869:Hirnantian
4773:Llandovery
4659:Ludfordian
4587:Lochkovian
4396:Ohio Shale
4212:Bashkirian
4176:Kasimovian
4105:Cisuralian
3516:Llandovery
3402:Ludfordian
3310:Lochkovian
2885:Bashkirian
2365:Llandovery
2226:Ludfordian
2122:Lochkovian
2013:Moorehouse
1668:Ohio Shale
1300:Bashkirian
939:Kasimovian
576:Cisuralian
355:References
327:spiriferid
284:glauconite
134:Appalachia
5373:formation
5234:Ediacaran
5098:Furongian
5006:Dapingian
4782:Telychian
4373:Famennian
4194:Moscovian
3525:Telychian
3101:Famennian
2847:Moscovian
2641:Furongian
2019:Edgecliff
1650:Elk Group
1568:Famennian
1096:Moscovian
286:pellets,
241:limestone
237:New River
177:Named for
115:limestone
111:sandstone
107:siltstone
88:Lithology
60:Underlies
52:Sub-units
46:Formation
5430:Devonian
5107:Stage 10
4925:Sandbian
4820:Aeronian
4713:Homerian
4682:Gorstian
4495:Eifelian
4472:Givetian
4411:Frasnian
4158:Gzhelian
4114:Asselian
3553:Aeronian
3471:Homerian
3430:Gorstian
3213:Eifelian
3190:Givetian
3144:Frasnian
2799:Virginia
2675:Series 2
2301:Homerian
2257:Gorstian
1974:Eifelian
1920:Givetian
1753:Frasnian
742:Gzhelian
304:biogenic
296:dolomite
276:Virginia
265:Eifelian
206:Devonian
187:Named by
162:Virginia
125:Location
119:dolomite
78:Overlies
36:Eifelian
5289:on the
4704:Wenlock
4622:Pridoli
4569:Pragian
3462:Wenlock
3365:Pridoli
3282:Pragian
2684:Stage 4
2292:Wenlock
2173:Pridoli
2104:Pragian
341:ash bed
312:Aeolian
300:calcite
211:in the
144:Country
93:Primary
5433:period
4976:Middle
4892:Katian
4650:Ludlow
4546:Emsian
4463:Middle
4291:Viséan
4038:Eocene
3761:Middle
3393:Ludlow
3259:Emsian
3181:Middle
2986:Viséan
2528:Middle
2217:Ludlow
2068:Emsian
2016:Nedrow
2010:Seneca
1911:Middle
1461:Viséan
343:, the
337:member
316:silica
261:Emsian
227:by an
154:Extent
130:Region
32:Emsian
5435:is a
5311:This
5293:page.
5037:Lower
4860:Upper
4537:Lower
4364:Upper
3779:Lower
3593:Upper
3250:Lower
3092:Upper
2574:Lower
2435:Upper
2059:Lower
1559:Upper
433:(PDF)
408:(PDF)
379:(PDF)
288:silty
221:chert
204:is a
103:Other
97:chert
5437:stub
5377:stub
5317:stub
495:2021
298:and
290:and
263:and
196:The
136:and
42:Type
3995:of
2797:of
535:of
464:doi
200:or
34:to
5482::
5207:pЄ
4086:Pz
4059:Mz
4028:Pe
4017:Cz
4006:Ph
3917:pЄ
2819:Pz
2808:Ph
2747:pЄ
2082:,
2078:,
1879:/
1850:/
557:Pz
546:Ph
458:.
441:25
439:.
435:.
420:^
410:.
391:^
381:.
362:^
351:.
164:,
160:,
117:,
113:,
109:,
70:,
66:,
30::
5468:e
5461:t
5454:v
5443:.
5408:e
5401:t
5394:v
5383:.
5348:e
5341:t
5334:v
5323:.
5225:Z
5216:♇
5089:Є
4851:O
4613:S
4355:D
4249:M
4149:⁋
4140:C
4096:P
4069:J
3985:e
3978:t
3971:v
3935:Z
3926:♇
3826:Є
3584:O
3356:S
3083:D
2931:M
2838:⁋
2829:C
2787:e
2780:t
2773:v
2632:Є
2552::
2426:O
2164:S
1550:D
1393:M
1316::
1243::
1112::
955::
871::
808::
758::
733:⁋
724:C
675::
592::
567:P
525:e
518:t
511:v
497:.
472:.
466::
385:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.