157:
367:
37:
2377:
424:
Cavaroc, V.V., and Flores, R.M., 1991, Red beds of the
Triassic Chugwater Group, southwestern Powder River basin, Wyoming, IN Evolution of sedimentary basins; Powder River basin: U.S. Geological Survey Bulletin, 1917-E, p. E1-E17.
1522:
399:
Pipiringos, G.N., 1968, Correlation and nomenclature of some
Triassic and Jurassic rocks in south-central Wyoming, IN Shorter contributions to general geology, 1967: U.S. Geological Survey Professional Paper, 594-D, p. D1-D26.
989:
493:
230:
and shales with interspersed sandstones. While this composition will lend itself to breaking easily and not outcropping, the shear size of the formation causes there to be large outcrops. Though most
412:
High, L.R., Jr., and Picard, M.D., 1969, Stratigraphic relations within upper
Chugwater Group (Triassic), Wyoming: American Association of Petroleum Geologists Bulletin, v. 53, no. 5, p. 1091-1104.
388:
2384:
1529:
996:
957:
500:
387:
Darton, N.H., 1904, Comparison of the stratigraphy of the Black Hills, Bighorn
Mountains, and Rocky Mountain Front Range: Geological Society of America Bulletin, v. 15, p. 379-448.
1935:
1768:
776:
2072:
1971:
1895:
952:
686:
1668:
1262:
288:
The
Chugwater Group is divided into various formations, depending on the basin in which it occurs. It is mapped in the following basins within the Rocky Mountains:
1993:
1875:
1773:
813:
723:
711:
458:
2120:
1673:
1658:
1323:
1139:
1059:
885:
2100:
1945:
1880:
1743:
1221:
930:
681:
1998:
1708:
1678:
1119:
833:
676:
630:
594:
2217:
1915:
1870:
1803:
1189:
920:
791:
2471:
2370:
2222:
2177:
2150:
2115:
2105:
2013:
1798:
1763:
1718:
1688:
1104:
786:
2516:
2341:
2336:
2314:
2278:
1988:
1983:
1905:
1885:
1865:
1778:
1738:
1693:
1683:
1601:
1596:
1469:
1464:
2008:
1910:
1515:
1134:
1099:
796:
706:
2445:
1300:
1295:
1164:
982:
486:
309:
823:
451:
2536:
2531:
444:
2526:
413:
315:
For example, in the Wind River and
Greater Green River basins, the formations (in ascending stratigraphic order) are:
223:
as well as having a disrupted texture because of the precipitation of gypsum crystals after deposition of the rock.
2521:
1753:
1079:
1169:
211:
of iron minerals in the rock. This color is periodically interrupted by streaks and spots of reduced
2023:
671:
188:
1827:
1199:
1179:
853:
320:
1216:
231:
2487:
1900:
1064:
905:
848:
701:
666:
2433:
1793:
1748:
1733:
1109:
910:
900:
691:
42:
8:
2018:
1955:
1783:
1089:
1084:
915:
340:
328:
79:
1843:
1698:
1631:
1482:
1416:
1305:
1257:
1159:
1114:
935:
925:
843:
838:
759:
696:
653:
635:
599:
467:
332:
316:
301:
261:
and gypsum. Small flecks of a dark, opaque mineral have been tentatively identified as
196:
140:
75:
65:
2319:
2297:
2283:
2261:
2254:
2204:
2172:
2164:
1925:
1890:
1758:
1703:
1338:
1328:
1290:
1267:
1194:
1149:
1129:
1069:
890:
863:
818:
781:
554:
305:
2455:
2187:
2143:
2095:
2028:
1940:
1920:
1848:
1728:
1713:
1653:
1636:
1371:
1333:
1285:
1252:
1208:
1184:
1049:
1042:
895:
880:
336:
293:
266:
61:
2155:
2110:
2085:
2003:
1930:
1860:
1788:
1723:
1663:
1381:
1277:
1124:
858:
771:
436:
2417:
2090:
2055:
1808:
1426:
1411:
1363:
1315:
1244:
1094:
645:
372:
324:
220:
215:, a light bluish-gray shade. Near the top of the formation is a thick layer of
207:
The most noticeable feature on a large scale is the brick-red color, caused by
426:
2510:
1818:
1584:
1054:
828:
297:
24:
401:
234:
are not visible due to the gypsum interruption, there are a few examples of
1174:
1144:
1074:
289:
239:
235:
2408:
2399:
2196:
1964:
1544:
1154:
1011:
546:
515:
156:
2306:
2134:
1614:
1033:
537:
366:
2245:
2064:
1575:
1555:
1435:
872:
743:
732:
622:
254:
227:
208:
172:
112:
94:
2464:
2236:
2046:
1836:
1623:
1352:
1235:
1022:
752:
586:
577:
526:
471:
352:
273:
258:
243:
184:
28:
2270:
1566:
1390:
613:
568:
277:
262:
191:
in
Colorado and Montana, but as a Group (set of formations), the
180:
176:
36:
2426:
1451:
806:
250:
219:
of very high quality. The whole rock is interrupted by gypsum
216:
160:
108:
2392:
104:
1537:
195:, in Wyoming. Despite its presence below the highly studied
1004:
508:
212:
351:
Relative age dating of the
Chugwater places it in the
187:
in the United States. It is recognized as a geologic
171:
is a mapped bedrock unit consisting primarily of red
362:
257:are also present, though in lesser amounts, as are
253:, which helps to account for its unusual hardness.
466:
339:, Crow Mountain Sandstone, unnamed red beds, and
2508:
265:. The minerals are cemented by a non-carbonate
2378:
1523:
990:
494:
452:
163:veins in the Chugwater, same outcrop as above
199:, the Chugwater receives little attention.
2393:Precambrian chronostratigraphy of Colorado
2385:
2371:
1530:
1516:
997:
983:
501:
487:
459:
445:
335:, the formations are: Red Peak Formation,
35:
2517:Sandstone formations of the United States
249:The main constituent of the Chugwater is
1538:Paleozoic chronostratigraphy of Colorado
155:
1005:Mesozoic chronostratigraphy of Colorado
509:Cenozoic chronostratigraphy of Colorado
2509:
2366:
1511:
978:
482:
440:
1041:
272:The Chugwater is a prime example of
13:
14:
2548:
226:The Chugwater consists mainly of
365:
276:, commonly deposited during the
246:of irregular shape, are common.
41:Outcrop of Chugwater Group near
2537:Geologic formations of Colorado
958:Independence Mountain Formation
283:
2532:Geologic formations of Montana
418:
406:
393:
381:
202:
1:
1936:Morgan Round Valley Formation
358:
1769:South Canyon Creek Formation
7:
19:Chugwater Formation (Group)
10:
2553:
2527:Geologic groups of Wyoming
1754:Sangre de Cristo Formation
777:Central Colorado Volcanics
127:Wyoming, Colorado, Montana
2463:
2454:
2425:
2416:
2407:
2398:
2362:
2305:
2296:
2269:
2253:
2244:
2235:
2195:
2186:
2163:
2142:
2133:
2073:Williams Canyon Formation
2063:
2054:
2045:
1979:
1972:Williams Canyon Formation
1963:
1954:
1896:Jacque Mountain Formation
1835:
1826:
1817:
1622:
1613:
1583:
1574:
1565:
1554:
1543:
1507:
1450:
1434:
1425:
1389:
1380:
1362:
1351:
1314:
1276:
1243:
1234:
1207:
1170:Pictured Cliffs Formation
1032:
1021:
1010:
974:
953:Gravel Mountain Formation
871:
805:
751:
742:
731:
644:
621:
612:
585:
576:
567:
545:
536:
525:
514:
478:
146:
136:
131:
123:
118:
100:
90:
85:
71:
57:
49:
34:
23:
18:
2024:Ste. Genevieve Formation
687:Martins Canyon Formation
672:Cedar Mountain Formation
1669:Council Grove Formation
1263:Ralston Creek Formation
1200:Williams Fork Formation
1180:Point Lookout Formation
854:Poison Canyon Formation
321:Crow Mountain Formation
242:. Examples of infilled
2522:Triassic United States
1994:Headscrabble Formation
1876:Eagle Valley Evaporite
1774:Stone Corral Formation
1217:Burro Canyon Formation
814:Blanco Basin Formation
724:Grouse Mountain Basalt
712:Wagon Tongue Formation
346:
280:and Triassic periods.
269:, probably siliceous.
232:sedimentary structures
164:
2488:Uncompahgre Formation
2121:Pinyon Park Formation
1901:Kansas City Formation
1674:Crestone Conglomerate
1659:Cedar Hills Formation
1324:Glen Canyon Formation
1140:Lion Canyon Formation
1065:Cliff House Sandstone
1060:Castle Gate Formation
906:Middle Park Formation
886:Arapahoe Conglomerate
849:Green River Formation
702:Troublesome Formation
667:Browns Park Formation
159:
2434:Uinta Mountain Group
2101:Kinderhook Formation
1946:Sharpsdale Formation
1881:Glen Eyrie Formation
1794:Wellington Formation
1749:Phosphoria Formation
1744:Owl Canyon Formation
1734:Minnekahta Formation
1222:Horsetooth Formation
931:South Park Formation
911:Nacimiento Formation
901:Fort Union Formation
692:North Park Formation
682:Los Pintos Formation
43:Thermopolis, Wyoming
2019:St. Louis Formation
1999:Leadville Formation
1784:Wabaunsee Formation
1709:Ingleside Formation
1679:Day Creek Formation
1592:Chugwater Formation
1460:Chugwater Formation
1443:Chugwater Formation
1399:Chugwater Formation
1120:Kremmling Formation
1090:Fruitland Formation
1085:Fox Hills Formation
1080:Fort Hays Limestone
916:Ojo Alamo Formation
834:Echo Park Formation
677:Flat Tops Volcanics
631:Dry Union Formation
595:Dry Union Formation
341:Popo Agie Formation
329:Popo Agie Formation
175:, in the states of
169:Chugwater Formation
80:Goose Egg Formation
25:Stratigraphic range
2218:Arbuckle Formation
1916:Marmaton Formation
1871:Cherokee Formation
1844:Fountain Formation
1804:Wolfcamp Formation
1699:Glorieta Formation
1632:Fountain Formation
1483:Moenkopi Formation
1417:Moenkopi Formation
1306:Sundance Formation
1258:Morrison Formation
1190:Trinidad Formation
1160:Niobrara Formation
1115:Kirtland Formation
936:Washakie Formation
926:San Jose Formation
921:Raton Conglomerate
844:Huerfano Formation
839:Farisita Formation
792:Pinnacle Formation
760:Arikaree Formation
697:Santa Fe Formation
654:Arikaree Formation
636:Ogallala Formation
600:Ogallala Formation
468:Chronostratigraphy
333:Powder River Basin
331:. However, in the
317:Red Peak Formation
302:Powder River Basin
197:Morrison Formation
165:
150:N. H. Darton, 1904
141:Chugwater, Wyoming
76:Dinwoody Formation
66:Morrison Formation
2504:
2503:
2500:
2499:
2496:
2495:
2483:
2482:
2479:
2478:
2472:Owiyukuts Complex
2441:
2440:
2358:
2357:
2354:
2353:
2350:
2349:
2332:
2331:
2328:
2327:
2320:Sawatch Formation
2292:
2291:
2284:Sawatch Formation
2262:Dotsero Formation
2231:
2230:
2223:Manitou Formation
2213:
2212:
2205:Dotsero Formation
2178:Simpson Formation
2173:Harding Sandstone
2151:Fremont Limestone
2129:
2128:
2116:Parting Formation
2106:Misener Formation
2081:
2080:
2041:
2040:
2037:
2036:
2014:Spergen Formation
1926:Minturn Formation
1891:Hermosa Formation
1856:
1855:
1799:White Horse Group
1764:Shawnee Formation
1759:Satanka Formation
1719:Lansing Formation
1704:Hermosa Formation
1689:Forelle Formation
1649:
1648:
1645:
1644:
1609:
1608:
1503:
1502:
1499:
1498:
1495:
1494:
1491:
1490:
1478:
1477:
1407:
1406:
1347:
1346:
1339:Wingate Sandstone
1329:Kayenta Formation
1291:Entrada Formation
1268:Wanakah Formation
1230:
1229:
1195:Vermejo Formation
1150:Menefee Formation
1130:Laramie Formation
1105:Hygiene Formation
970:
969:
966:
965:
948:
947:
944:
943:
891:Bridger Formation
864:Wasatch Formation
819:Cuchara Formation
787:Conejos Formation
782:Chadron Formation
767:
766:
720:
719:
662:
661:
608:
607:
563:
562:
555:Alamosa Formation
306:Green River Basin
154:
153:
2544:
2461:
2460:
2423:
2422:
2414:
2413:
2405:
2404:
2387:
2380:
2373:
2364:
2363:
2342:Tintic Formation
2337:Reagan Formation
2315:Lodore Formation
2303:
2302:
2279:Lodore Formation
2251:
2250:
2242:
2241:
2193:
2192:
2140:
2139:
2096:Elbert Formation
2061:
2060:
2052:
2051:
2029:Warsaw Formation
1989:Gilman Formation
1984:Beulah Formation
1961:
1960:
1941:Morrow Formation
1921:Maroon Formation
1906:Kerber Formation
1886:Gothic Formation
1866:Belden Formation
1849:Madera Formation
1833:
1832:
1824:
1823:
1779:Sumner Formation
1739:Opeche Formation
1729:Maroon Formation
1714:Kaibab Limestone
1694:Glendo Formation
1684:Falcon Formation
1654:Blaine Formation
1637:Madera Formation
1620:
1619:
1602:Taloga Formation
1597:Lykins Formation
1581:
1580:
1572:
1571:
1563:
1562:
1558:
1552:
1551:
1547:
1532:
1525:
1518:
1509:
1508:
1470:Taloga Formation
1465:Lykins Formation
1432:
1431:
1387:
1386:
1372:Chinle Formation
1360:
1359:
1355:
1334:Navajo Formation
1286:Carmel Formation
1253:Curtis Formation
1241:
1240:
1185:Smoky Hill Chalk
1070:Codell Sandstone
1050:Benton Formation
1039:
1038:
1030:
1029:
1025:
1019:
1018:
1014:
999:
992:
985:
976:
975:
896:Denver Formation
881:Animas Formation
749:
748:
740:
739:
735:
619:
618:
583:
582:
574:
573:
543:
542:
534:
533:
529:
523:
522:
518:
503:
496:
489:
480:
479:
461:
454:
447:
438:
437:
429:
422:
416:
410:
404:
397:
391:
385:
375:
370:
369:
337:Alcova Limestone
294:Wind River Basin
62:Nugget Sandstone
39:
16:
15:
2552:
2551:
2547:
2546:
2545:
2543:
2542:
2541:
2507:
2506:
2505:
2492:
2475:
2450:
2437:
2394:
2391:
2346:
2324:
2288:
2265:
2227:
2209:
2182:
2159:
2156:Viola Formation
2125:
2111:Ouray Formation
2086:Aneth Formation
2077:
2033:
2009:Osage Formation
2004:Molas Formation
1975:
1950:
1931:Molas Formation
1911:Keyes Formation
1861:Atoka Formation
1852:
1813:
1789:Weber Formation
1724:Lyons Formation
1664:Chase Formation
1641:
1605:
1556:
1545:
1539:
1536:
1487:
1474:
1446:
1421:
1403:
1376:
1353:
1343:
1310:
1272:
1226:
1203:
1135:Lewis Formation
1125:Lance Formation
1100:Greenhorn Shale
1023:
1012:
1006:
1003:
962:
940:
867:
859:Uinta Formation
801:
797:Pitch Formation
772:Brule Formation
763:
733:
727:
716:
707:Trump Formation
658:
640:
604:
559:
527:
516:
510:
507:
474:
465:
433:
432:
423:
419:
411:
407:
398:
394:
386:
382:
371:
364:
361:
349:
286:
238:and occasional
205:
193:Chugwater Group
45:
12:
11:
5:
2550:
2540:
2539:
2534:
2529:
2524:
2519:
2502:
2501:
2498:
2497:
2494:
2493:
2491:
2490:
2484:
2481:
2480:
2477:
2476:
2474:
2469:
2467:
2458:
2452:
2451:
2449:
2448:
2446:Tava Formation
2442:
2439:
2438:
2436:
2431:
2429:
2420:
2411:
2402:
2396:
2395:
2390:
2389:
2382:
2375:
2367:
2360:
2359:
2356:
2355:
2352:
2351:
2348:
2347:
2345:
2344:
2339:
2333:
2330:
2329:
2326:
2325:
2323:
2322:
2317:
2311:
2309:
2300:
2294:
2293:
2290:
2289:
2287:
2286:
2281:
2275:
2273:
2267:
2266:
2264:
2259:
2257:
2248:
2239:
2233:
2232:
2229:
2228:
2226:
2225:
2220:
2214:
2211:
2210:
2208:
2207:
2201:
2199:
2190:
2184:
2183:
2181:
2180:
2175:
2169:
2167:
2161:
2160:
2158:
2153:
2148:
2146:
2137:
2131:
2130:
2127:
2126:
2124:
2123:
2118:
2113:
2108:
2103:
2098:
2093:
2091:Dyer Formation
2088:
2082:
2079:
2078:
2076:
2075:
2069:
2067:
2058:
2049:
2043:
2042:
2039:
2038:
2035:
2034:
2032:
2031:
2026:
2021:
2016:
2011:
2006:
2001:
1996:
1991:
1986:
1980:
1977:
1976:
1974:
1969:
1967:
1958:
1952:
1951:
1949:
1948:
1943:
1938:
1933:
1928:
1923:
1918:
1913:
1908:
1903:
1898:
1893:
1888:
1883:
1878:
1873:
1868:
1863:
1857:
1854:
1853:
1851:
1846:
1841:
1839:
1830:
1821:
1815:
1814:
1812:
1811:
1809:Yeso Formation
1806:
1801:
1796:
1791:
1786:
1781:
1776:
1771:
1766:
1761:
1756:
1751:
1746:
1741:
1736:
1731:
1726:
1721:
1716:
1711:
1706:
1701:
1696:
1691:
1686:
1681:
1676:
1671:
1666:
1661:
1656:
1650:
1647:
1646:
1643:
1642:
1640:
1639:
1634:
1628:
1626:
1617:
1611:
1610:
1607:
1606:
1604:
1599:
1594:
1589:
1587:
1578:
1569:
1560:
1549:
1541:
1540:
1535:
1534:
1527:
1520:
1512:
1505:
1504:
1501:
1500:
1497:
1496:
1493:
1492:
1489:
1488:
1486:
1485:
1479:
1476:
1475:
1473:
1472:
1467:
1462:
1456:
1454:
1448:
1447:
1445:
1440:
1438:
1429:
1423:
1422:
1420:
1419:
1414:
1412:Jelm Formation
1408:
1405:
1404:
1402:
1401:
1395:
1393:
1384:
1378:
1377:
1375:
1374:
1368:
1366:
1357:
1349:
1348:
1345:
1344:
1342:
1341:
1336:
1331:
1326:
1320:
1318:
1312:
1311:
1309:
1308:
1303:
1301:Page Formation
1298:
1296:Garo Formation
1293:
1288:
1282:
1280:
1274:
1273:
1271:
1270:
1265:
1260:
1255:
1249:
1247:
1238:
1232:
1231:
1228:
1227:
1225:
1224:
1219:
1213:
1211:
1205:
1204:
1202:
1197:
1192:
1187:
1182:
1177:
1172:
1167:
1165:Pando Porphyry
1162:
1157:
1152:
1147:
1142:
1137:
1132:
1127:
1122:
1117:
1112:
1107:
1102:
1097:
1095:Graneros Shale
1092:
1087:
1082:
1077:
1072:
1067:
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431:
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427:link to report
417:
405:
402:link to report
392:
379:
378:
377:
376:
373:Geology portal
360:
357:
348:
345:
325:Jelm Formation
285:
282:
204:
201:
152:
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138:
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9:
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1585:Changhsingian
1582:
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1239:
1237:
1233:
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1218:
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1201:
1198:
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1191:
1188:
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1168:
1166:
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1128:
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1123:
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1081:
1078:
1076:
1073:
1071:
1068:
1066:
1063:
1061:
1058:
1056:
1055:Carlile Shale
1053:
1051:
1048:
1046:
1044:
1040:
1037:
1035:
1031:
1028:
1026:
1020:
1017:
1015:
1009:
1000:
995:
993:
988:
986:
981:
980:
977:
973:
959:
956:
954:
951:
950:
937:
934:
932:
929:
927:
924:
922:
919:
917:
914:
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904:
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899:
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878:
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870:
865:
862:
860:
857:
855:
852:
850:
847:
845:
842:
840:
837:
835:
832:
830:
829:Dawson Arkose
827:
825:
822:
820:
817:
815:
812:
810:
808:
804:
798:
795:
793:
790:
788:
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778:
775:
773:
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769:
761:
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747:
745:
741:
738:
736:
730:
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722:
713:
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708:
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703:
700:
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695:
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690:
688:
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683:
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675:
673:
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664:
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651:
649:
647:
643:
637:
634:
632:
629:
628:
626:
624:
620:
617:
615:
611:
601:
598:
596:
593:
592:
590:
588:
584:
581:
579:
575:
572:
570:
566:
556:
553:
552:
550:
548:
544:
541:
539:
535:
532:
530:
524:
521:
519:
513:
504:
499:
497:
492:
490:
485:
484:
481:
477:
473:
469:
462:
457:
455:
450:
448:
443:
442:
439:
435:
428:
421:
415:
409:
403:
396:
390:
384:
380:
374:
368:
363:
356:
354:
344:
342:
338:
334:
330:
326:
322:
318:
313:
311:
310:Laramie Basin
307:
303:
299:
298:Bighorn Basin
295:
291:
281:
279:
275:
270:
268:
264:
260:
256:
252:
247:
245:
241:
237:
233:
229:
224:
222:
218:
214:
210:
200:
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190:
186:
182:
178:
174:
170:
162:
158:
149:
145:
142:
139:
135:
130:
126:
122:
117:
114:
110:
106:
103:
99:
96:
93:
89:
84:
81:
77:
74:
70:
67:
63:
60:
56:
52:
48:
44:
38:
33:
30:
26:
22:
17:
1591:
1459:
1442:
1398:
1175:Pierre Shale
1145:Mancos Shale
1075:Dakota Group
434:
420:
408:
395:
383:
350:
314:
290:Denver Basin
287:
284:Stratigraphy
271:
248:
240:crossbedding
236:ripple marks
225:
206:
192:
168:
166:
132:Type section
2197:Tremadocian
1965:Tournaisian
1155:Mowry Shale
1110:Juana Lopez
824:D2 Sequence
547:Pleistocene
203:Description
53:sedimentary
2511:Categories
2307:Guzhangian
1615:Cisuralian
646:Aquitanian
359:References
304:, Greater
2246:Furongian
2065:Famennian
1576:Lopingian
1436:Olenekian
873:Paleocene
744:Oligocene
623:Messinian
255:Feldspars
244:mudcracks
228:siltstone
209:oxidation
189:formation
173:sandstone
137:Named for
113:limestone
95:sandstone
86:Lithology
58:Underlies
2465:Siderian
2298:Series 3
2255:Stage 10
1837:Gzhelian
1624:Asselian
753:Chattian
587:Zanclean
578:Pliocene
472:Colorado
414:abstract
389:abstract
355:Period.
353:Triassic
274:red beds
259:hematite
185:Colorado
147:Named by
119:Location
72:Overlies
29:Triassic
2271:Paibian
1391:Anisian
614:Miocene
278:Permian
263:biotite
181:Montana
177:Wyoming
91:Primary
2427:Tonian
2165:Middle
1452:Induan
1382:Middle
1278:Middle
807:Eocene
327:, and
267:matrix
251:quartz
217:gypsum
183:, and
161:Gypsum
124:Extent
109:gypsum
2188:Lower
2144:Upper
2056:Upper
1427:Lower
1364:Upper
1316:Lower
1245:Upper
1209:Lower
1043:Upper
221:veins
105:shale
101:Other
213:iron
167:The
50:Type
470:of
347:Age
2513::
2400:pŠ
1557:Pz
1546:Ph
1354:Tr
1024:Mz
1013:Ph
734:Pe
528:Cz
517:Ph
343:.
323:,
319:,
312:.
308:,
300:,
296:,
292:,
179:,
111:,
107:,
78:,
64:,
27::
2456:X
2418:Z
2409:ā
2386:e
2379:t
2372:v
2237:Š
2135:O
2047:D
1956:M
1828:ā
1819:C
1567:P
1531:e
1524:t
1517:v
1236:J
1034:K
998:e
991:t
984:v
569:N
538:Q
502:e
495:t
488:v
460:e
453:t
446:v
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