Pekin Formation
Geology
Group: Chatham
Members: unnamed (13)
Lithologies: not reported (3), claystone (2), mudstone (1), "shale" (3), siltstone (2), sandstone (3), conglomerate (2)
Paleoenvironments: terrestrial indet. (9), lagoonal (2), fluvial indet. (1), fluvial-lacustrine indet. (1)
Age range: Carnian or 237.00000 to 228.00000 Ma