21st Conference on the Geology of Long Island

and Metropolitan New York

Site location at Cold Spring Harbor Labs

Digital elevation map with site location

Cobble layer overlooking Cold Spring Harbor

Cobbles and small boulders

Cobble layer with till above

Cobble layer with till above

Soil horizon above stratified drift

Stratified drift with alternating coarse layers

Thick sandy outwash below coarse layer

Huge pile of cobbles & small boulders from coarse layer

Cobbles and small boulders separated from coarse layer

Iridescent oxide coating on small boulder

Quartz ventifacts

Cross-section of bluffs in Port Washington sand mines, c. 1974

Approx, extent of Cretaceous cuesta in western L.I. Sound, Lewis & Stone, 1991

Location of channel deposits in western L.I. Sound, Stone, et.al.2005

Acknowledgments The author wishes to thank the management of the Cold Spring Harbor Laboratory for providing access to the site during the excavation process.

References Fuller, M.L., 1914. The Geology of Long Island, New York. U.S. Geological Survey Professional Paper 82, 231p. Isbister, J., 1966. Geology and Hydrology of Northeastern Nassau County, Long Island, New York: U.S. Geological Survey Water Supply Paper 1825, 89p. Mills, H.C., 2013, An extraordinary deposit of very coarse stratified drift, Cold Spring Harbor, NY, 20th Annual Long Island Geologist Conference, Stony Brook University.Mills, H.C., and Wells, P.D., 1974, Ice-shove deformation and glacial stratigraphy of Port Washington, Long Island, New York: Geol. Soc. America Bull., v. 85, pp. 357-364.Sirkin, L.A., and Stuckenrath, R., 1980, The Portwashingtonian warm interval in the northern Atlantic coastal plain: Geol. Soc. America Bull., Part 1, v. 91, pp. 332-336.Stone, J.R., et. al., 2005, Quaternary Geologic Map of Connecticut and Long Island Sound Basin: Scientific Investigations Map 2784, U.S. Geological Survey.