Arroyo Formation

Geology

Group: Clear Fork

Members: unnamed (15)

Lithologies: not reported (1), claystone (12), "shale" (2), sandstone (11)

Paleoenvironments: terrestrial indet. (15)

Age range: Kungurian or 283.30000 to 274.40000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Sakmarian - Kungurian293.52 - 274.4USA (Texas) (11148)
Kungurian283.3 - 274.4USA (Texas) (13046 22715 28256 28261 28264 28266 28267 28270 28272 28273 28275 28276 28277 85342 91038)