John Boyd Thacher State Park Escarpment
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.
Reason for Designation: Identified as a unique geologic feature by the NYS Geological Highway Map
(NYS Museum, NYS Geological Survey).