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John Boyd Thacher State Park Escarpment

John Boyd Thacher State Park in the fall with colored trees

John Boyd Thacher State Park
Located in Albany County

Image Courtesy of Dr. J Bret Bennington


Type: Park (Public).

Features: Northeast edge of Allegheny Plateau; panoramic views of Hudson Valley,
Adirondacks, Green & Berkshire Mountains; Late Silurian & early-mid Devonian marine sedimentary rocks.

Feature Type: Park.

Reference: NYS Geological Association Field Trip Guidebook, 63rd Annual Meeting 1991;
PAC Stratigraphy of the Helderberg Group: Cycle Definition, Allogenic Surfaces, Hierchy
Correlation, and Relationship to Vail Sequences.

Quadrangle: Altamont.

Reason for Designation: Identified as a unique geologic feature by the NYS Geological Highway Map
(NYS Museum, NYS Geological Survey).