243:
116:
387:, in 1890. Lucas included the Dockum Group within the Chinle when he raised the Chinle to group status, but this has not been widely accepted. Dockum was named before the Chinle, and if Lucas is correct, his "Chinle Group" should be named the Dockum Group due to stratigraphic nomenclature rules.
933:
Cummins, W.F. 1892. Report on the geography, topography, and geology of the Llano
Estacado or Staked Plains with notes on the geology of the country west of the Plains. In: Dumble, E.T. (ed), Third annual report of the Geological Survey of Texas 1891. Austin: Henry Hutchings, State
438:
The Santa Rosa-Tecovas sequence has sediments made up of clasts derived from the north, northeast, and east of the Dockum, very similar to clasts found in the lower Chinle. However, the
Trujillo-Cooper Canyon sequence's sediments are derived from the
863:
1203:
Litwin, Ronald J.; Traverse, Alfred; Ash, Sidney R. (July 1991). "Preliminary palynological zonation of the Chinle formation, southwestern U.S.A., and its correlation to the Newark supergroup (eastern U.S.A.)".
943:
Lucas, S.G., 1993. The Chinle Group: revised stratigraphy and biochronology of Upper
Triassic Nonmarine strata in the western United States. Museum of Northern Arizona Bulletin, v. 59, p. 27–50.
590:
1046:
629:
431:), overbank deposits with minor channel and lacustrine deposits, are separated from the Santa Rosa-Tecovas by an unconformity. In eastern New Mexico, the
953:
Cather, S.M.; Zeiger, Kate E.; Mack, Greg H.; Kelley, Shari A. (2013). "Toward standardization of
Phanerozoic stratigraphic nomenclature in New Mexico".
466:, a light brown, thinly bedded sandstone. This region is structurally separated from the Dockum Group exposures to the south by the Sierra Grande arch.
1265:
864:"Applications and limitations of palynology in age, climatic, and paleoenviromental analyses of Triassic sequences in North America"
805:
329:
panhandle. The Dockum reaches a maximum thickness of slightly over 650 m but is usually much thinner. The Dockum rests on an
450:
The Dockum Group in extreme northeastern New Mexico is divided four formations. These are, in ascending stratigraphic order, the
1260:
435:
overlies the Cooper Canyon
Formation. The Redonda has gradational eastward transition into the upper Cooper Canyon Formation.
815:
1061:
980:"Principal reference section for the Santa Rosa formation of Middle and Late Triassic age, Guadalupe County, New Mexico"
1255:
901:
776:
602:
367:
in central New Mexico. This has led to controversy over the stratigraphic nomenclature for the Chinle and Dockum.
205:
1270:
1087:
1012:
198:
835:
Dunay, R.E.; Fisher, M.J. (June 1979). "Palynology of the Dockum group (Upper
Triassic), Texas, U.S.A.".
657:
639:
963:
788:
784:
758:
725:
618:
580:
559:
542:
424:
376:
1088:"Geology of Northeastern New Mexico, union and Colfax Counties, New Mexico: A Geologic Summary"
958:
750:
566:
522:
459:
412:
721:
688:
536:
428:
384:
338:
157:
379:
for this formation. The Dockum was named by
William Fletcher Cummins for a good exposure in
1240:
1175:
1164:"Depositional setting and vertebrate biostratigraphy of the Triassic Dockum Group of Texas"
1136:
585:
491:
451:
400:
8:
529:
515:
486:
463:
455:
1234:
1179:
1140:
746:
553:
500:
496:
420:
396:
314:
1148:
1121:
419:) deposits with lenses of channel-deposits. Minor lacustrine deposits also occur. The
1217:
848:
780:
754:
703:
571:
508:
432:
408:
1213:
1183:
1144:
991:
844:
810:
653:
440:
360:
345:
147:
902:"The saga of the Dockum Group and the case of the Texas/New Mexico boundary fault"
480:
444:
129:
306:
302:
1249:
458:, a reddish-brown siltstone and sandstone with some conglomerate lenses; the
290:
248:
220:
207:
115:
74:
27:
768:
665:
330:
49:
1188:
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713:
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59:
1013:"Triassic stratigraphy in the Sangre de Cristo Mountains, New Mexico"
735:
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182:
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43:
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380:
348:
were deposited roughly at the same time and share many of the same
326:
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69:
64:
54:
35:
996:
979:
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104:
79:
31:
1086:
Ziegler, Kate E.; Ramos, Frank C.; Zimmerer, Matthew J. (2019).
395:
Lehman (1994) advocated a simplified stratigraphy of up to five
694:
404:
318:
462:, a red to pale green mudstone with sandstone lenses; and the
660:. The faunachrons are based on first and last appearances of
353:
1122:"Global Triassic tetrapod biostratigraphy and biochronology"
909:
New Mexico Bureau of Mines & Mineral
Resources Bulletin
120:
Steamboat Butte, showing Dockum Group red beds at its base
1054:
New Mexico Bureau of Mines and
Mineral Resources Bulletin
1020:
New Mexico
Geological Society Field Conference Guidebook
1038:
454:, a mudstone with coarse-grained sandstone lenses; the
1155:
952:
16:
Geologic group of western Texas and eastern New Mexico
1095:
New Mexico Geological Society Field Conference Series
1085:
1241:
GEOLEX database bibliographic references for Dockum
471:
Regional stratigraphic subunits of the Dockum Group
363:. The two units are approximately separated by the
1044:
1202:
1129:Palaeogeography, Palaeoclimatology, Palaeoecology
1079:
1004:
763:Upper Petrified Forest, Moss Back, Monitor Butte
399:. According to his system, the basal unit is the
1247:
1196:
1162:Lehman, Thomas; Chatterjee, Sankar (June 2005).
1161:
828:
647:
946:
1047:"Geologic studies of Union County, New Mexico"
1010:
1045:Baldwin, Brewster; Muehlberger, W.R. (1959).
978:Finch, W.I.; Lupe, Robert; Ash, S.R. (1988).
895:
893:
891:
889:
868:New Mexico Museum of Natural History Bulletin
977:
971:
955:New Mexico Geological Society Spring Meeting
1011:Lucas, S.G.; Hunt, A.P.; Huber, P. (1990).
834:
370:
1113:
886:
415:), which is dominated by overbank (distal
114:
1187:
995:
962:
806:List of dinosaur-bearing rock formations
1248:
899:
861:
1206:Review of Palaeobotany and Palynology
1119:
837:Review of Palaeobotany and Palynology
512:
507:
411:(and its New Mexican equivalent, the
317:with minor exposures in southwestern
816:Triassic land vertebrate faunachrons
407:. The Santa Rosa is overlain by the
403:, a braided stream channel-related
359:. They appear to have very similar
13:
1120:Lucas, Spencer G (November 1998).
14:
1282:
1228:
730:Owl Rock, Upper Petrified Forest
1266:Triassic System of North America
1235:GEOLEX database entry for Dockum
241:
47:
1168:Journal of Earth System Science
984:U.S. Geological Survey Bulletin
652:Correlations and ages based on
390:
937:
927:
855:
1:
1261:Geologic groups of New Mexico
1149:10.1016/S0031-0182(98)00117-5
821:
648:Dockum and Chinle correlation
499:(northeast NM, southeast CO,
1218:10.1016/0034-6667(91)90028-2
849:10.1016/0034-6667(79)90025-3
7:
799:
793:Shinarump, Temple Mountain
658:Land Vertebrate Faunachrons
10:
1287:
640:Camp Springs Conglomerate
638:
617:
614:
611:
601:
584:
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552:
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26:
21:
1256:Geologic groups of Texas
623:(correlation uncertain)
596:(correlation uncertain)
477:East-central New Mexico
423:, channel-deposits, and
371:History of investigation
271:William Fletcher Cummins
718:early to middle Norian
708:Rock Point/Church Rock
619:Colorado City Formation
591:Cobert Canyon Sandstone
581:Cooper Canyon Formation
560:Cooper Canyon Formation
543:Cooper Canyon Formation
425:Cooper Canyon Formation
375:There is no designated
305:found primarily on the
567:Garita Creek Formation
523:Sloan Canyon Formation
460:Sloan Canyon Formation
413:Garita Creek Formation
1271:Upper Triassic Series
900:Lehman, T.M. (1994).
630:Boren Ranch Sandstone
537:Bull Canyon Formation
429:Bull Canyon Formation
385:Dickens County, Texas
383:of town of Dockum in
339:Anton Chico Formation
263:Town of Dockum, Texas
158:Anton Chico Formation
664:. Simplified Chinle
607:Tres Lagunas Member
603:Santa Rosa Formation
586:Baldy Hill Formation
452:Baldy Hill Formation
401:Santa Rosa Sandstone
293:(approximately late
1180:2005JESS..114..325L
1141:1998PPP...143..347L
1060:(2). Archived from
862:Cornet, B. (1993).
773:lower late Carnian
612:Los Esteros Member
530:Travesser Formation
516:Sheep Pen Sandstone
497:Dry Cimarron Valley
473:
464:Sheep Pen Sandstone
456:Travesser Formation
427:(also known as the
397:geologic formations
217: /
28:Stratigraphic range
1189:10.1007/BF02702953
636:Tecolotito Member
554:Trujillo Formation
501:Oklahoma Panhandle
469:
421:Trujillo Sandstone
337:(242–234 Ma) aged
315:eastern New Mexico
221:35.356°N 102.910°W
1067:on 30 August 2017
797:
796:
668:based on Litwin.
645:
644:
572:Tecovas Formation
509:Redonda Formation
492:Howard County, TX
441:Ouachita orogenic
433:Redonda Formation
409:Tecovas Formation
361:paleoenvironments
301:, or 223–200 Ma)
283:
282:
1278:
1222:
1221:
1212:(3–4): 269–287.
1200:
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811:Chinle Formation
671:
670:
654:Spencer G. Lucas
615:Variegated beds
487:Garza County, TX
474:
468:
346:Chinle Formation
247:
245:
244:
232:
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229:
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226:35.356; -102.910
222:
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148:Exeter Sandstone
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757:, lower-middle
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481:Texas Panhandle
445:Marathon Uplift
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344:The Dockum and
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1229:External links
1227:
1224:
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1195:
1174:(3): 325–351.
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1135:(4): 347–384.
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303:geologic group
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997:10.3133/b1804
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974:
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789:Colorado City
786:
785:Cooper Canyon
782:
778:
775:
772:
770:
767:
766:
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760:
759:Cooper Canyon
756:
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726:Cooper Canyon
723:
720:
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702:
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687:
686:
683:Chinle units
682:
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631:
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576:Magenta beds
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443:belts of the
442:
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406:
402:
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388:
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382:
378:
377:type locality
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342:
340:
336:
332:
328:
324:
320:
316:
312:
311:western Texas
308:
304:
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296:
292:
291:Late Triassic
288:
278:
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249:United States
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1205:
1198:
1171:
1167:
1157:
1132:
1128:
1115:
1103:. Retrieved
1098:
1094:
1081:
1069:. Retrieved
1062:the original
1057:
1053:
1040:
1028:. Retrieved
1023:
1019:
1006:
987:
983:
973:
954:
948:
939:
929:
917:. Retrieved
912:
908:
876:. Retrieved
871:
867:
857:
843:(1): 61–92.
840:
836:
830:
769:Otischalkian
751:Garita Creek
680:Dockum units
677:Proposed age
666:stratigraphy
651:
622:
595:
589:
470:
449:
437:
394:
391:Stratigraphy
374:
343:
331:unconformity
286:
284:
276:Year defined
255:Type section
22:Dockum Group
1105:1 September
1071:1 September
1030:12 November
919:1 September
878:1 September
740:upper late
722:Bull Canyon
674:Faunachron
350:vertebrates
224: /
212:102°54′36″W
199:Coordinates
1250:Categories
1101:(4): 47–54
822:References
777:Santa Rosa
714:Revueltian
662:phytosaurs
417:floodplain
365:Rio Grande
321:, eastern
209:35°21′22″N
1026:: 305–318
959:CiteSeerX
736:Adamanian
485:southern
333:over the
260:Named for
183:Siltstone
173:Sandstone
164:Lithology
144:Underlies
136:Sub-units
934:Printer.
800:See also
783:, lower
779:, lower
753:, upper
747:Trujillo
724:, upper
699:Rhaetian
689:Apachean
381:vicinity
327:Oklahoma
323:Colorado
299:Rhaetian
297:through
268:Named by
193:Location
187:Mudstone
154:Overlies
139:See text
36:Rhaetian
1176:Bibcode
1137:Bibcode
915:: 37–51
874:: 75–93
781:Tecovas
755:Tecovas
742:Carnian
704:Redonda
558:middle
357:fossils
335:Anisian
295:Carnian
237:Country
169:Primary
32:Carnian
30:: late
1237:, USGS
961:
957:: 12.
695:Norian
579:lower
541:upper
405:facies
325:, and
319:Kansas
287:Dockum
246:
1125:(PDF)
1091:(PDF)
1065:(PDF)
1050:(PDF)
1016:(PDF)
905:(PDF)
693:late
354:plant
289:is a
179:Other
130:Group
1107:2020
1073:2020
1032:2021
988:1804
921:2020
880:2020
352:and
313:and
285:The
279:1890
126:Type
50:PreꞒ
1214:doi
1184:doi
1172:114
1145:doi
1133:143
992:doi
913:150
845:doi
593:?
341:.
309:of
1252::
1210:68
1208:.
1182:.
1170:.
1166:.
1143:.
1131:.
1127:.
1099:70
1097:.
1093:.
1058:63
1056:.
1052:.
1024:41
1022:.
1018:.
990:.
986:.
982:.
911:.
907:.
888:^
870:.
866:.
841:28
839:.
787:,
749:,
656:'
621:?
588:/
503:)
447:.
185:,
100:Pg
44:Ma
1220:.
1216::
1192:.
1186::
1178::
1151:.
1147::
1139::
1109:.
1075:.
1034:.
1000:.
994::
967:.
923:.
882:.
872:3
851:.
847::
697:-
105:N
95:K
90:J
85:T
80:P
75:C
70:D
65:S
60:O
55:Ꞓ
39:~
34:-
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