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U.S. Geological Survey Open-File Report 02-002
Geological Framework Data from Long Island Sound, 1981-1990:
A Digital Data Release
CERC Technical Report 81-3
Table 2.
| ERA | PERIOD | EPOCH | CHARACTER AND ORIGIN OF DEPOSITS |
| Cenozoic | Quaternary | Holocene | Estuarine and marine soft organic muds from fluvial and shelf sources; modern marsh peat along coast |
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Pleistocene | Localized and discontinuous ground till, moraine segments, and stratified sand and gravel outwash deposits | |
| Mesozoic | Triassics | A basin of sandstone, siltstone, conglomerates, and basaltic dikes intersect the shore at New Haven, Conn.; may continue under Long Island sound toward the Long Island Sound Mainland | |
| Paleozoic and Precambrian | Metamorphic and igneous crystalline basement rock |