The Pollack Farm Site near Cheswold, Delaware, is named for a borrow pit excavated during highway construction. The excavation exposed a portion of the Cheswold sands of the lower Miocene Calvert Formation. Two sand intervals (Cheswold C-3 and C-4) yielded a diverse assemblage of land and marine vertebrate remains and more than 100 species of mollusks. An isolated occurrence of a sandy silt (the radiolarian bed) stratigraphically between the two macrofossil-bearing units yielded only siliceous microfossils—radiolarians, diatoms, and sponge spicules.
Please give proper credit to the Delaware Geological Survey.
Benson, R.N., 1998, Geology and Paleontology of the Lower Miocene Pollack Farm Fossil Site Delaware: Delaware Geological Survey Special Publication 21.
Delaware Geological Survey
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