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The NYC Region - a glacial erratic of Fordham Gneiss

By Geology and Ecology of National Parks
This is a photo of a glacial erratic of Fordham Gneiss in the New York Botanical Gardents.
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Detailed Description

A glacial erratic of Fordham Gneiss in the New York Botanical Gardents. The large boulder was probably split by the physical weathering action of tree roots. The tree has long since vanished.

Sources/Usage

Public Domain.