Yorktown Formation
Geology
Group: Chesapeake
Members: unnamed (91), basal (1), Moore House (11), Morgarts Beach (4), Rushmere (7), Sunken Meadow (5), Zone 1 (1)
Lithologies: not reported (45), "siliciclastic" (13), siltstone (1), sandstone (49), marl (3), "limestone" (1)
Paleoenvironments: marine indet. (44), terrestrial indet. (1), peritidal (1), shallow subtidal indet. (8), marginal marine indet. (1), coastal indet. (63), estuary/bay (1), offshore (1)
Collections