Stratigraphy of the Chesapeake Group of Maryland and Virginia
Geological Society of America, 1976 - Geology, Stratigraphic - 55 pages
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abundant mollusks Astarte Atlantic Coastal Plain basin biostratigraphic burrows Calvert County Calvert Formation Camp Conoy Chesapeake Bay Chesapeake Group Chesapecten jeffersonius Choptank Formation Claremont Formation Clark and Miller clayey sand Cobham Formation Cobham Wharf Conrad Cove Point unit Croatan Formation deposits diatomaceous erosion Fairhaven Figure 15 Formation Definition Gardner glauconitic Glycymeris Greenish sandy clay guide fossil Figure illustrated in Plate James River lithologic lithostratigraphic Little Cove Point lower Marvacrassatella Marys County Marys Formation mean high-tide level measured sections Measured type section Miocene mollusks Moore House Member Morgarts Beach Member overlain Paleontologic character Pecten phosphatic Pliocene poorly sorted Range Zone Figure Rappahannock River reach sea level Rushmere Member sand containing sand fraction sanddollar spines sandy clay containing sediments Shattuck shell beds shelly sand stratigraphic Sunken Meadow Member Surry County Tortonian type area unconformities upper Ward and Blackwelder York River Yorktown Formation zone 19