315:
de Witt, Wallace, Jr., Roen, J.B., and
Wallace, L.G., 1993, Stratigraphy of Devonian black shales and associated rocks in the Appalachian basin, IN Roen, J.B., and Kepferle, R.C., eds., Petroleum geology of the Devonian and Mississippian black shale of eastern North America: U.S. Geological Survey
344:
Hasson, Kenneth O., and
Dennison, John M., 1978, STRATIGRAPHY OF THE DEVONIAN HARRELL AND MILLBORO SHALES IN PARTS OF PENNSYLVANIA, MARYLAND, WEST VIRGINIA, AND VIRGINIA, Project Final Report for Energy Research and Development Administration Contract #EY-77-C-21-8153, May 1978
185:
The
Harrell Formation was first described by Charles Butts in 1918. Hasson and Dennison (1978) state "The Harrell Shale consists of very dark gray, thinly laminated, platy- to sheety-weathering shale underlain in certain areas by the grayish black shale of the Burket Member."
413:
420:
346:
69:
1387:
1507:
1397:
1694:
1269:
1758:
288:). In 1918, when Butts described and named the type section, the USGS topo map spelled the location "Harrell", but the local spelling was "Horrell".
1728:
870:
406:
1738:
1723:
357:
1748:
371:
1753:
260:
1743:
329:
1733:
254:
630:
1605:
585:
1167:
1071:
1558:
1489:
1392:
1162:
602:
121:
1625:
1502:
1346:
865:
671:
79:
41:
8:
1689:
1463:
1369:
1264:
1241:
1108:
717:
707:
702:
685:
666:
638:
194:
Hasson and
Dennison reported the following fossils from several outcrops of the Harrell:
1677:
1590:
1580:
1231:
1195:
1172:
1140:
1013:
995:
959:
949:
855:
837:
763:
758:
429:
61:
398:
1620:
1610:
1585:
1543:
1433:
1428:
1412:
1374:
1341:
1318:
1226:
1190:
885:
661:
1473:
1402:
1336:
1313:
1296:
1236:
1209:
1076:
1066:
1031:
875:
735:
712:
656:
332:, central Pennsylvania: American Journal of Science, 4th series, v. 46, p. 523-537.
65:
1600:
1575:
1246:
944:
916:
899:
822:
817:
773:
753:
620:
87:
389:
1661:
1450:
990:
973:
954:
939:
921:
860:
800:
83:
1717:
1058:
827:
768:
576:
558:
433:
275:
262:
170:
27:
1182:
1157:
1126:
1103:
1086:
694:
162:
51:
1652:
1643:
1482:
1421:
1351:
745:
441:
1615:
1551:
1495:
1305:
1287:
1095:
1023:
832:
648:
612:
541:
224:
1670:
1534:
1442:
1218:
809:
521:
463:
106:
727:
1525:
1361:
1256:
1149:
1118:
1049:
931:
908:
847:
791:
594:
550:
505:
494:
452:
297:
238:
198:
174:
166:
151:
31:
1005:
532:
158:
1328:
982:
474:
102:
428:
340:
338:
296:Relative age dating places the Harrell in the late
335:
330:Geologic section of Blair and Huntingdon Counties
1715:
414:
390:"Blair County Pennsylvania Railroad Stations"
324:
322:
421:
407:
1759:Devonian southern paleotemperate deposits
358:""Topography: Hollidaysburg Quadrangle""
319:
1716:
1729:Shale formations of the United States
402:
253:Type locality is at Horrell Station,
248:
360:. Department of the Interior. 1920.
16:Mapped bedrock in the United States
13:
14:
1770:
1739:Devonian geology of Pennsylvania
1724:Devonian System of North America
372:"Another McAbee plant explosion"
382:
364:
350:
309:
180:
1:
303:
1749:Devonian geology of Virginia
378:. 18 August 1904. p. 5.
316:Bulletin, 1909-B, p. B1-B57.
7:
10:
1775:
255:Blair County, Pennsylvania
189:
1669:
1660:
1651:
1642:
1542:
1533:
1524:
1481:
1472:
1441:
1420:
1411:
1360:
1327:
1304:
1295:
1286:
1255:
1217:
1208:
1181:
1148:
1139:
1117:
1094:
1085:
1057:
1048:
1022:
1004:
981:
972:
930:
907:
898:
846:
808:
799:
790:
744:
726:
693:
684:
647:
629:
611:
593:
584:
575:
549:
540:
531:
520:
504:
493:
473:
462:
451:
440:
140:
135:
127:
117:
112:
98:
93:
75:
57:
47:
37:
26:
21:
237:Cricoconarida (class of
1606:Conococheague Formation
70:Trimmers Rock Formation
1754:Devonian West Virginia
1168:Williamsport Formation
1072:Bass Islands Formation
328:Butts, Charles, 1918,
291:
1744:Devonian Pennsylvania
1559:Copper Ridge Dolomite
1490:Wells Creek Formation
1393:Martinsburg Formation
1388:Dolly Ridge Formation
1163:Wills Creek Formation
603:Monongahela Formation
243:Styliolina fissurella
215:Pterochaenia fragilis
122:Appalachian Mountains
1626:Waynesboro Formation
1503:Beekmantown Dolomite
1347:Reedsville Formation
866:West Falls Formation
672:Pocahontas Formation
233:Probeloceras lutheri
80:Mahantango Formation
1690:Swift Run Formation
1464:St. Peter Sandstone
1370:Lexington Limestone
1265:Tuscarora Sandstone
1242:Rose Hill Formation
1109:Tonoloway Formation
718:Bluefield Formation
708:Princeton Sandstone
703:Bluestone Formation
667:New River Formation
639:Allegheny Formation
376:The Pittsburgh Post
272: /
144:Charles Butts, 1918
28:Stratigraphic range
22:Harrell Shale Group
1678:Catoctin Formation
1591:Weverton Formation
1581:Antietam Formation
1508:Rose Run Sandstone
1398:Nealmont Limestone
1232:McKenzie Formation
1196:McKenzie Formation
1173:McKenzie Formation
1014:Oriskany Sandstone
996:Huntersville Chert
960:Huntersville Chert
950:Onondaga Limestone
856:Brallier Formation
838:Brallier Formation
764:Maccrady Formation
759:Cuyahoga Formation
511:Igneous intrusives
480:Igneous intrusives
430:Chronostratigraphy
229:Bactrites aciculum
62:Brallier Formation
1734:Devonian Maryland
1711:
1710:
1707:
1706:
1703:
1702:
1695:Grenville Complex
1685:
1684:
1638:
1637:
1634:
1633:
1621:Tomstown Dolomite
1611:Elbrook Formation
1595:Loudoun Formation
1586:Harpers Formation
1571:
1570:
1567:
1566:
1520:
1519:
1516:
1515:
1459:
1458:
1434:Black River Group
1429:Trenton Limestone
1383:
1382:
1375:Trenton Limestone
1342:Juniata Formation
1319:Juniata Formation
1282:
1281:
1278:
1277:
1270:Clinton Sandstone
1227:Lockport Dolomite
1204:
1203:
1191:Lockport Dolomite
1135:
1134:
1044:
1043:
1040:
1039:
968:
967:
894:
893:
886:Genesee Formation
786:
785:
782:
781:
680:
679:
662:Kanawha Formation
571:
570:
567:
566:
516:
515:
489:
488:
485:
484:
276:40.450°N 78.283°W
249:Notable Exposures
211:Paracardium doris
155:Harrell Formation
148:
147:
1766:
1667:
1666:
1658:
1657:
1649:
1648:
1540:
1539:
1531:
1530:
1479:
1478:
1418:
1417:
1403:Oswego Formation
1337:Cincinnati Group
1314:Cincinnati Group
1302:
1301:
1293:
1292:
1237:Keefer Formation
1215:
1214:
1146:
1145:
1092:
1091:
1077:Keyser Formation
1067:Bertie Formation
1055:
1054:
1032:Helderberg Group
979:
978:
905:
904:
876:Sonyea Formation
806:
805:
797:
796:
736:Greenbrier Group
713:Hinton Formation
691:
690:
657:Pottsville Group
591:
590:
582:
581:
547:
546:
538:
537:
529:
528:
524:
502:
501:
497:
471:
470:
466:
460:
459:
455:
449:
448:
444:
423:
416:
409:
400:
399:
394:
393:
386:
380:
379:
368:
362:
361:
354:
348:
342:
333:
326:
317:
313:
287:
286:
284:
283:
282:
277:
273:
270:
269:
268:
265:
203:Buchiola livonae
66:Sonyea Formation
19:
18:
1774:
1773:
1769:
1768:
1767:
1765:
1764:
1763:
1714:
1713:
1712:
1699:
1681:
1630:
1601:Conasauga Group
1576:Chilhowee Group
1563:
1512:
1468:
1455:
1437:
1407:
1379:
1356:
1323:
1274:
1251:
1247:Rochester Shale
1200:
1177:
1131:
1113:
1081:
1036:
1018:
1000:
964:
945:Marcellus Shale
926:
917:Tully Limestone
890:
842:
823:Berea Sandstone
818:Price Formation
778:
774:Berea Sandstone
754:Price Formation
740:
722:
676:
643:
625:
621:Conemaugh Group
607:
563:
522:
512:
495:
481:
464:
453:
442:
436:
427:
397:
388:
387:
383:
370:
369:
365:
356:
355:
351:
343:
336:
327:
320:
314:
310:
306:
294:
281:40.450; -78.283
280:
278:
274:
271:
266:
263:
261:
259:
258:
251:
207:B. retrostriata
192:
183:
88:Tully Limestone
17:
12:
11:
5:
1772:
1762:
1761:
1756:
1751:
1746:
1741:
1736:
1731:
1726:
1709:
1708:
1705:
1704:
1701:
1700:
1698:
1697:
1692:
1686:
1683:
1682:
1680:
1675:
1673:
1664:
1655:
1646:
1640:
1639:
1636:
1635:
1632:
1631:
1629:
1628:
1623:
1618:
1613:
1608:
1603:
1597:
1596:
1593:
1588:
1583:
1578:
1572:
1569:
1568:
1565:
1564:
1562:
1561:
1555:
1554:
1548:
1546:
1537:
1528:
1522:
1521:
1518:
1517:
1514:
1513:
1511:
1510:
1505:
1499:
1498:
1492:
1487:
1485:
1476:
1470:
1469:
1467:
1466:
1460:
1457:
1456:
1454:
1453:
1451:St. Paul Group
1447:
1445:
1439:
1438:
1436:
1431:
1426:
1424:
1415:
1409:
1408:
1406:
1405:
1400:
1395:
1390:
1384:
1381:
1380:
1378:
1377:
1372:
1366:
1364:
1358:
1357:
1355:
1354:
1349:
1344:
1339:
1333:
1331:
1325:
1324:
1322:
1321:
1316:
1310:
1308:
1299:
1290:
1284:
1283:
1280:
1279:
1276:
1275:
1273:
1272:
1267:
1261:
1259:
1253:
1252:
1250:
1249:
1244:
1239:
1234:
1229:
1223:
1221:
1212:
1206:
1205:
1202:
1201:
1199:
1198:
1193:
1187:
1185:
1179:
1178:
1176:
1175:
1170:
1165:
1160:
1154:
1152:
1143:
1137:
1136:
1133:
1132:
1130:
1129:
1123:
1121:
1115:
1114:
1112:
1111:
1106:
1100:
1098:
1089:
1083:
1082:
1080:
1079:
1074:
1069:
1063:
1061:
1052:
1046:
1045:
1042:
1041:
1038:
1037:
1035:
1034:
1028:
1026:
1020:
1019:
1017:
1016:
1010:
1008:
1002:
1001:
999:
998:
993:
991:Needmore Shale
987:
985:
976:
970:
969:
966:
965:
963:
962:
957:
955:Needmore Shale
952:
947:
942:
940:Hamilton Group
936:
934:
928:
927:
925:
924:
922:Hamilton Group
919:
913:
911:
902:
896:
895:
892:
891:
889:
888:
883:
878:
873:
868:
863:
861:Java Formation
858:
852:
850:
844:
843:
841:
840:
835:
830:
825:
820:
814:
812:
803:
794:
788:
787:
784:
783:
780:
779:
777:
776:
771:
766:
761:
756:
750:
748:
742:
741:
739:
738:
732:
730:
724:
723:
721:
720:
715:
710:
705:
699:
697:
688:
682:
681:
678:
677:
675:
674:
669:
664:
659:
653:
651:
645:
644:
642:
641:
635:
633:
627:
626:
624:
623:
617:
615:
609:
608:
606:
605:
599:
597:
588:
579:
573:
572:
569:
568:
565:
564:
562:
561:
555:
553:
544:
535:
526:
518:
517:
514:
513:
510:
508:
499:
491:
490:
487:
486:
483:
482:
479:
477:
468:
457:
446:
438:
437:
426:
425:
418:
411:
403:
396:
395:
381:
363:
349:
334:
318:
307:
305:
302:
293:
290:
250:
247:
246:
245:
235:
222:
219:Lunlulicardium
191:
188:
182:
179:
146:
145:
142:
138:
137:
133:
132:
129:
125:
124:
119:
115:
114:
110:
109:
100:
96:
95:
91:
90:
84:Millboro Shale
77:
73:
72:
59:
55:
54:
49:
45:
44:
39:
35:
34:
24:
23:
15:
9:
6:
4:
3:
2:
1771:
1760:
1757:
1755:
1752:
1750:
1747:
1745:
1742:
1740:
1737:
1735:
1732:
1730:
1727:
1725:
1722:
1721:
1719:
1696:
1693:
1691:
1688:
1687:
1679:
1676:
1674:
1672:
1668:
1665:
1663:
1659:
1656:
1654:
1650:
1647:
1645:
1641:
1627:
1624:
1622:
1619:
1617:
1614:
1612:
1609:
1607:
1604:
1602:
1599:
1598:
1594:
1592:
1589:
1587:
1584:
1582:
1579:
1577:
1574:
1573:
1560:
1557:
1556:
1553:
1550:
1549:
1547:
1545:
1541:
1538:
1536:
1532:
1529:
1527:
1523:
1509:
1506:
1504:
1501:
1500:
1497:
1494:
1493:
1491:
1488:
1486:
1484:
1480:
1477:
1475:
1471:
1465:
1462:
1461:
1452:
1449:
1448:
1446:
1444:
1440:
1435:
1432:
1430:
1427:
1425:
1423:
1419:
1416:
1414:
1410:
1404:
1401:
1399:
1396:
1394:
1391:
1389:
1386:
1385:
1376:
1373:
1371:
1368:
1367:
1365:
1363:
1359:
1353:
1350:
1348:
1345:
1343:
1340:
1338:
1335:
1334:
1332:
1330:
1326:
1320:
1317:
1315:
1312:
1311:
1309:
1307:
1303:
1300:
1298:
1294:
1291:
1289:
1285:
1271:
1268:
1266:
1263:
1262:
1260:
1258:
1254:
1248:
1245:
1243:
1240:
1238:
1235:
1233:
1230:
1228:
1225:
1224:
1222:
1220:
1216:
1213:
1211:
1207:
1197:
1194:
1192:
1189:
1188:
1186:
1184:
1180:
1174:
1171:
1169:
1166:
1164:
1161:
1159:
1156:
1155:
1153:
1151:
1147:
1144:
1142:
1138:
1128:
1125:
1124:
1122:
1120:
1116:
1110:
1107:
1105:
1102:
1101:
1099:
1097:
1093:
1090:
1088:
1084:
1078:
1075:
1073:
1070:
1068:
1065:
1064:
1062:
1060:
1056:
1053:
1051:
1047:
1033:
1030:
1029:
1027:
1025:
1021:
1015:
1012:
1011:
1009:
1007:
1003:
997:
994:
992:
989:
988:
986:
984:
980:
977:
975:
971:
961:
958:
956:
953:
951:
948:
946:
943:
941:
938:
937:
935:
933:
929:
923:
920:
918:
915:
914:
912:
910:
906:
903:
901:
897:
887:
884:
882:
881:Harrell Shale
879:
877:
874:
872:
869:
867:
864:
862:
859:
857:
854:
853:
851:
849:
845:
839:
836:
834:
831:
829:
828:Bedford Shale
826:
824:
821:
819:
816:
815:
813:
811:
807:
804:
802:
798:
795:
793:
789:
775:
772:
770:
769:Sunbury Shale
767:
765:
762:
760:
757:
755:
752:
751:
749:
747:
743:
737:
734:
733:
731:
729:
725:
719:
716:
714:
711:
709:
706:
704:
701:
700:
698:
696:
692:
689:
687:
683:
673:
670:
668:
665:
663:
660:
658:
655:
654:
652:
650:
646:
640:
637:
636:
634:
632:
628:
622:
619:
618:
616:
614:
610:
604:
601:
600:
598:
596:
592:
589:
587:
583:
580:
578:
574:
560:
559:Dunkard Group
557:
556:
554:
552:
548:
545:
543:
539:
536:
534:
530:
527:
525:
519:
509:
507:
503:
500:
498:
492:
478:
476:
472:
469:
467:
461:
458:
456:
450:
447:
445:
439:
435:
434:West Virginia
431:
424:
419:
417:
412:
410:
405:
404:
401:
391:
385:
377:
373:
367:
359:
353:
347:
341:
339:
331:
325:
323:
312:
308:
301:
299:
289:
285:
256:
244:
240:
236:
234:
230:
226:
223:
220:
216:
212:
208:
204:
200:
197:
196:
195:
187:
178:
176:
172:
171:West Virginia
168:
164:
160:
156:
153:
143:
139:
134:
131:United States
130:
126:
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78:
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63:
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56:
53:
50:
46:
43:
40:
36:
33:
29:
25:
20:
1183:Sheinwoodian
1158:Salina Group
1127:Salina Group
1104:Salina Group
880:
695:Serpukhovian
384:
375:
366:
352:
311:
295:
252:
242:
232:
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218:
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202:
193:
184:
163:Pennsylvania
157:is a mapped
154:
149:
136:Type section
52:Burket Shale
1483:Tremadocian
1422:Darriwilian
1352:Utica Shale
871:Rhinestreet
746:Tournaisian
279: /
225:Cephalopoda
181:Description
1718:Categories
1616:Rome Group
1552:Knox Group
1496:Knox Group
1306:Hirnantian
1210:Llandovery
1096:Ludfordian
1024:Lochkovian
833:Ohio Shale
649:Bashkirian
613:Kasimovian
542:Cisuralian
304:References
1671:Ediacaran
1535:Furongian
1443:Dapingian
1219:Telychian
810:Famennian
631:Moscovian
107:sandstone
94:Lithology
58:Underlies
48:Sub-units
1544:Stage 10
1362:Sandbian
1257:Aeronian
1150:Homerian
1119:Gorstian
932:Eifelian
909:Givetian
848:Frasnian
595:Gzhelian
551:Asselian
298:Devonian
239:Mollusca
199:Bivalvia
175:Virginia
167:Maryland
161:unit in
152:Devonian
141:Named by
113:Location
76:Overlies
32:Frasnian
1141:Wenlock
1059:Pridoli
1006:Pragian
267:78°17′W
264:40°27′N
190:Fossils
159:bedrock
128:Country
99:Primary
1413:Middle
1329:Katian
1087:Ludlow
983:Emsian
900:Middle
728:Viséan
475:Eocene
173:, and
118:Region
86:, and
1474:Lower
1297:Upper
974:Lower
801:Upper
205:(?),
103:shale
42:Group
241:):
150:The
38:Type
432:of
292:Age
227::
221:(?)
201::
1720::
1644:pЄ
523:Pz
496:Mz
465:Pe
454:Cz
443:Ph
374:.
337:^
321:^
300:.
231:,
217:,
213:,
209:,
177:.
169:,
165:,
105:,
82:,
68:,
64:,
30::
1662:Z
1653:♇
1526:Є
1288:O
1050:S
792:D
686:M
586:⁋
577:C
533:P
506:J
422:e
415:t
408:v
392:.
257:(
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