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Prepared in cooperation with with the Connecticut Department of Environmental Protection

U.S. Geological Survey Open-File Report 02-002

Geological Framework Data from Long Island Sound, 1981-1990:

A Digital Data Release

East-Central Long Island Sound: Summary Report

KEY TO ACOUSTIC UNITS AND MAJOR UNCONFORMITIES

Qhm - Postglacial marine deposits
um - Marine unconformity
Qlf - Upper lacustrine and fluvial deposits
uf1 - Postglacial fluvial unconformity
Qg1 - Lower glacial lake deposits
Qt - Glacial deposits, mostly till
Qtm - End-moraine deposits
Qd - Glacial drift
uf2 - Late Tertiary-early Pleistocene fluvial unconformity
Ku - Coastal plain strata
uf3 - Pre-Cretaceous fluvial unconformity
Pz - Bedrock

• Horizontal scales are approximate.

• Vertical scales are based on 1,500 m/s.

• Reflectors are dashed where extrapolated.

• Vertical exaggeration is abbreviated vert. exag.