John Boyd Thacher State Park - Helderberg Escarpment
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.
For online reference please visit - www.nysga.net/Guidebooks.html

Quadrangle: Altamont.

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