View of a dike of peridotite intruding into Geneseo Shale (Genesee Group). The shale dates from the Devonian Period, and is located in a quarry at Portland Point on Cayuga Lake in Lansing, Tompkins County. (Dike: a body of igneous rock that cuts across layers of sedimentary rock. Peridotite: a greenish coarse-grained igneous rock consisting mostly of the mineral olivine. Devonian Period: the span of the Earth's history from about 408 to 360 million years ago.)

Identifier
NYSA_A3045-78_Dn_CD46

Date Original
1924

Source
New York State Archives. Education Dept. Division of Visual Instruction. Instructional lantern slides, 1911-1925, A3045-78, DnCD46

Rights
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