Exter Formation
Geology
Group: Keuper
Members: unnamed (8)
Lithologies: not reported (1), "siliciclastic" (1), mudstone (2), "shale" (2), siltstone (1), sandstone (1), chalk (1)
Paleoenvironments: marine indet. (3), terrestrial indet. (2), deltaic indet. (2), lacustrine - small (1)
Age range: Rhaetian or 205.70000 to 201.40000 Ma