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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 1.
| ERA | PERIOD | EPOCH | UNIT | CHARACTER AND ORIGIN OF DEPOSITS |
| Cenozoic | Quaternary | Holocene (recent) | Quartzose sand, beach and dune deposits, and fine-grained lagoon sediments | |
| Pleistocene | Harbor Hill Moran Ronkonkoma Moran |
Ground and terminal moraine; stratified deposits of sand and gravel, cobbles, silt and clay | ||
| 20-foot Clay | Grayish-green, silty-clay, glauconitic fine sand (marine) | |||
| Gardiners Clay | Grayish-green, silty-clay (marine) | |||
| Jameco Gravel Manetto Gravel |
Fine to very-coarse sand and gravel; scattered beds of silt and clay (fluvial or glacial outwash) | |||
| Mesozoic | Cretaceous | Upper Cretaceous | Monmouth Group Matawan Group Magothy Formation |
Quartzose sand interbedded with silt and clay |
| Raritan Formation Raritan Clay |
Silty, sand, brownish-gray clay with thin beds of sand and gravel | |||
| Lloyd Sand | Quartzose fine to coarse sand and gravel; interbedded clay and silty sand is common | |||
| Precambrian or Paleozoic | Crystalline Bedrock | Undifferentiated, consolidated, metamorphic granite |