Clear Fork Group

Geology

Formations: unnamed (1), Arroyo (15), Arroyo or Vale (1), Choza (8), Lueders (1), Vale (29)

Lithologies: not reported (7), "siliciclastic" (3), claystone (14), mudstone (1), "shale" (8), siltstone (9), sandstone (15), conglomerate (18), dolomite (1)

Paleoenvironments: marine indet. (2), terrestrial indet. (26), marginal marine indet. (1), fluvial indet. (1), coarse channel fill (11), "channel" (2), wet floodplain (2), dry floodplain (4), fluvial-lacustrine indet. (1), lacustrine - small (1), pond (3)

Age range: base of the Leonardian to the top of the Kungurian or 286.00000 to 274.40000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Sakmarian - Kungurian293.52 - 274.4USA (Texas) (11000 11145 11146 11148)
Artinskian290.1 - 283.3USA (Texas) (178669)
Leonardian286.0 - 274.4USA (Texas) (68171 79601 80574 85361 85362 177006 177018 178739)
Kungurian283.3 - 274.4USA (Texas) (12976 27705 13046 85553 22715 27704 28256 28261 28264 28266 28267 28270 28272 28273 28275 28276 28277 36571 85125 85342 85550 85551 85552 85554 85555 85556 90452 91038 128588 132658 177000 177001 177002 177003 177005 177014 177015 177017 177019 178738 197319 207420)