Schunemunk Mountain Conglomerate

May 29, 2004

Conglomerate copy

Provided and copyright by: Dan Brownstein
Summary author: Dan Brownstein

This is an outstanding example of a puddingstone conglomerate from Schunemunk Mountain in New York. Schunemunk Mountain is an isolated Devonian-age ridge in a sea of Ordovician-age Martinsburg Shale. Note the exceptionally large quartz cobbles. Conglomerates form in near-shore environments, similar perhaps to what beaches look like today in Northern California. The Schunemunk puddingstone was also extensively polished during the last glacial period, which further reveals the unique texture of this rock.

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