Mercia Mudstone Group

Geology

Formations: unnamed (5), Auchenhew Mudstone (12), Blue Anchor (2), Keuper Waterstones (3), Tarporley Siltstone (2)

Lithologies: not reported (3), claystone (1), mudstone (10), sandstone (8), marl (3), "limestone" (1)

Paleoenvironments: terrestrial indet. (8), carbonate indet. (1), peritidal (12), paralic indet. (1), alluvial fan (1), lacustrine indet. (1)

Age range: base of the Early/Lower Triassic to the top of the Late/Upper Triassic or 252.17000 to 201.40000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Early/Lower Triassic252.17 - 247.2United Kingdom (England) (164932 164930)
Anisian247.2 - 242.0United Kingdom (England) (52505 80838 83053 184946 186039)
Ladinian242.0 - 237.0United Kingdom (Scotland) (181936 181937 181938 181939 181940 181941 181942 181943 181944 181945 181946 181947)
Late/Upper Triassic237.0 - 201.4United Kingdom (Wales) (57952)
Norian228.0 - 208.5United Kingdom (Wales) (57949 222914)
Rhaetian208.5 - 201.3United Kingdom (England) (89048)
Rhaetian208.5 - 201.3United Kingdom (Wales) (72293)