Fossil sample from Miocene Calvert Formation (http://www.mgs.md.gov/geology/fossils/calvert_cliffs_fs.html)
Diatomaceous earth/sandy clay strata (no marl present--no HCl reaction at sample location).
Plankton tow from dock at boat ramp at Orleans Beach, Spirit Lake, IA
F. crotonensis colony Plankton tow from dock
Tuft Colony
Marginal costae: 5 in 5um 1 process on valve face
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