This outcrop of phyllite is by a roadside parking area on route I-91 southbound, north of exit 6 between Springfield and Rockingham, Vermont. It is a pelitic phyllite of the Gile Mountain Formation, of late Early Devonian age (approx. 400 million years old). Gile Mountain, the type locality, is farther north in Vermont just across the Connecticut River from Hanover, New Hampshire.
Phyllite Outcrop
By Andrew Alden, About.com Guide
In outcrop, phyllite looks like slate or schist. You have to inspect it close up to classify phyllite correctly.
Photo (c) 2008 Andrew Alden, licensed to About.com
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