Abstract: This is the guidebook of the 100th anniversary field meeting of the New York State Geological Association (NYSGA) held at Hamilton College September 20-21, 2025. Two versions of the guidebook are available - a full resolution version and a version that has been optimized for printing. Tewksbury and Bailey are the editors of this guidebook, which contains the following background papers and field guides for the seven field trips of the meeting. The First NYSGA Field Meeting in 1925 Dedication to Professor Nelson Clark (“Rocksy”) Dale Saturday Field Trip Guides A1: The Middle Devonian of Central New York State: Classic Sections of the North American Standard Leaders: Alex Bartholomew, Carlton Brett, Chuck Ver Straeten , Gordon Baird, and Linda Ivany A2: Igneous and Metamorphic Rocks of the Black and Moose River Valleys, Western Adirondack Highlands, NY Leaders: Robert Darling and Joseph Gonzalez A3: Fossils of Central New York's Middle Devonian Hamilton Group Leader: Kris Kusnerik Sunday Field Trip Guides B1: The Silurian-Devonian Boundary in the Helderberg Group and the (not really) Oldest Devonian Reef Leaders: James Ebert and Damon Matteson B2: Geology of the Lewis (Seventy Mine) and Oak Hill Wollastonite Deposits Leaders: William Peck and Eve Bailey B3: Clinton Ironstones of the Silurian in Their Type Area of Central New York Leaders: Nicholas Sullivan and Carlton Brett B4: The Devonian on Land, and Earth’s Oldest Known Fossil Forest, Catskill Mountains Leaders: Chuck Ver Straeten and Bill Stein
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