Sidney Mountain Quarry - Sand Volcano
Sidney Mountain Bluestone Quarry
Located in Delaware County
Image courtesy of Dan Bishuk, Jon Hairabedian, James Ebert
Features: Rare & unique exposure of albic argillisols & gleyed protosols;
Non-marine transition sequences of the Cattaraugus Magnafacies.
Feature Type: Sedimentology.
Reference: NYS Geological Association Field Trip Guidebook, 63rd Annual Meeting 1991;
Storm-Dominated Shelf and Tidally-Influenced Foreshore Sedimentation, Upper Devonian Sonyea Group,
Bainbridge to Sidney Center, New York. For Online Reference Please visit: - www.nysga.net/Guidebooks.html
Reason for Designation: Sand volcano found in association with intraformational conglomerate beds
within Planar-Bedded Multistory Sandbody Facies. The advanced degree of pedogenesis observed in
the albic argillisols of Sidney Mountain Quarry and the oxisols reported at Skytop Lane Quarry in the
study area have not been reported elsewhere in NYS. The newly recognized paleosols in the Sonyea
Group have proven to be critical clues to understanding the dynamics of the Catskill shoreline.
Sedimentary features of statewide significance are recorded within the suite of tidally influenced facies at this location.