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Glens Falls Limestone

Geologic Formation in NY, VT

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Lithology

Limestone

Geologic Age

Late Ordovician (459.3 Ma – 445.3 Ma ago)

Geologic Unit Label

Ogf

Dark-bluish-gray-weathering, thinly bedded dark-gray to black granular limestone; locally grades upward into sooty- weathering shaly limestone beds rich in fragments of the trilobite Cryptolithus. Rocks of the Laurentian Margin. Part of the Adirondack lowlands and Lake Champlain lowlands (west of the Orwell and Champlain thrusts). Also part of the Vermont Valley sequence and Middlebury synclinorium (above the Orwell and Champlain thrusts).

— USGS

Taxonomy

Classified As

Geologic Formation