Open-File Report 2002-002

Generalized stratigraphy of Long Island
(from Williams, 1976)

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

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