Benson, R.N.2008-11-062008-11-061998http://udspace.udel.edu/handle/19716/3590The 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.Pollack FarmCheswold, Delawarelower Miocene Calvert Formationmollusksdiatomssponge spiculessiliceous microfossils—radiolariansBook