Yixian Formation
Geology
Group: Jehol
Members: unnamed (140), Dakangpu (8), Dawangzhangzi (14), Jianshangou (27), Jingangshan (4), Lujiatun (14), Zhuanchengzi (1)
Lithologies: not reported (39), "siliciclastic" (5), claystone (2), mudstone (113), "shale" (44), siltstone (13), sandstone (4), "volcaniclastic" (1), tuff (4)
Paleoenvironments: marine indet. (1), terrestrial indet. (28), fluvial indet. (5), fluvial-lacustrine indet. (6), lacustrine - large (124), lacustrine - small (2), lacustrine indet. (42)
Age range: base of the Late/Upper Valanginian to the top of the Late/Upper Barremian or 140.20000 to 125.45000 Ma
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