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The igneous and metamorphic crystalline basement rock of New York formed in the Precambrian and are coterminous with the Canadian Shield.The Adirondack Mountains, Thousand Islands, Hudson Highlands, and Fordham gneiss, along with outcrops in the Berkshires just over the state line in Massachusetts, are part of the Grenville Province, a large piece of continental crust which accreted to the ...
Pages in category "Ordovician geology of New York (state)" The following 29 pages are in this category, out of 29 total. This list may not reflect recent changes. C.
The Amsterdam Limestone is a geologic formation in New York. It dates back to the Ordovician period . It is a unit of the Black River Group in Eastern New York.
The Utica Shale is a stratigraphical unit of Upper Ordovician age in the Appalachian Basin. It underlies much of the northeastern United States and adjacent parts of Canada. It takes the name from the city of Utica, New York, as it was first described as an outcrop along the Starch Factory Creek east of the city by Ebenezer Emmons in 1842. [2]
The Austin Glen Member of the Normanskill Formation is an upper Middle Ordovician unit of interbedded greywackes and shales that outcrops in eastern New York State. [1] It was deposited in a deep marine setting in a foreland basin during the Taconic orogeny. [2] Its sediment source was mainly the erosion of preexisting sedimentary rocks. [2]
Group or Formation Period Notes Akron Formation: Silurian: Anse Maranda Formation: Cambrian: Bear Creek Shale: Silurian: Becraft Limestone: Devonian: Beekmantown Group/Fort Cassin Formation
The rocks exposed in the escarpment date back to the Middle Ordovician to Early Devonian. In 1934 the Schenectady Gazette described how the Tory Cave, one of the limestone caves to be found in the escarpment, routinely had stalagmites of ice in the springtime. [5]
It preserves fossils dating back to the Ordovician Period. The group is host to pyritized trilobites and other fossils in New York including the Beecher's Trilobite ...