Choptank Formation

Geology

Group: Chesapeake

Members: unnamed (6), Boston Cliffs (15), Conoy (5), Drumcliff (30), St. Leonard (1)

Lithologies: not reported (6), claystone (10), siltstone (2), sandstone (36)

Paleoenvironments: marine indet. (20), terrestrial indet. (1), offshore shelf (2), marginal marine indet. (1), coastal indet. (19), estuary/bay (1), shoreface (8), offshore (5)

Age range: base of the Serravallian to the top of the Barstovian or 13.82000 to 12.50000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Barstovian16.3 - 12.5USA (Maryland) (18519)
Serravallian13.82 - 11.62USA (Maryland) (13408 37348 51715 51725 51726 51731 60376 70546 71816 70830 70831 70832 70833 70838 70840 70841 70843 70844 70845 70846 70847 70848 70854 70855 70856 71638 71639 71815 71819 79103 79104 79105 79106 79107 79108 79109 79110 79111 79112 79113 79114 79115 79116 79352 79353 89455 97475 144121 160229 160353)
Serravallian13.82 - 11.62USA (Virginia) (13407 71643 71817 71818 106061 126605)