Geology of Southeastern New York
IDEAS Field Trip - October 2008

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All photos by J Bret Bennigton unless otherwise noted.

John Boyd Thatcher State Park, NY

Group Hiking the Indian Ladder Trail
Group Hiking the Indian Ladder Trail
Manlius Block
Manlius Block
Students examining beds of Tentaculites fossils on a fallen block of the Manlius Formation.
Tentaculites Fossils
Tentaculites Fossils
Tentaculites are small, cone-shaped shells of uncertain taxonomic affinity (they may be a type of extinct mollusc).
Tentaculites Fossils
Tentaculites Fossils
Outflow Creek Falls
Outflow Creek Falls
Normally, this is not a major waterfall - heavy rains the night before turned the trickle into a torrent.
Outflow Creek Falls
Outflow Creek Falls
Outflow Creek Falls
Outflow Creek Falls
Outflow Creek Falls
Outflow Creek Falls
Waterfall at Outflow Creek pouring onto Late Ordovician beds of greywacke and shale (Schenectady Beds).
Group at Minelot Falls
Group at Minelot Falls
Minelot Falls
Minelot Falls
Escarpment Through Falls
Escarpment Through Falls
View of the Helderberg escarpment through the falling water of Minelot Falls.
Rondout and Manlius
Rondout and Manlius
Exposure of karstified Roundout Formation at the base of the Manlius Formation, Minelot Falls.
Rondout and Manlius
Rondout and Manlius
Rondout and Manlius
Rondout and Manlius
Manlius Mudcracks
Manlius Mudcracks
Mudcraks preserved on the underside of a bedding plane in the Manlius Formation.
Manlius Mudcracks
Manlius Mudcracks
Closeup view of mudcracks.
Helderberg Escarpment
Helderberg Escarpment
Minelot Falls
Minelot Falls
Minelot Falls
Minelot Falls
Stromatoporoid Zone
Stromatoporoid Zone
Distinctive gnarled appearance of weathered stromatoporoids at top of the Manlius Formation.
Stromatoporoid
Stromatoporoid
Stromatoporoids are mound-like structures composed of layers of calcium carbonate showing vertical pillars. They are interpreted to be an extinct form of reef-building calcareous sponge.
Group at Lunch
Group at Lunch
Lunch at John Boyd Thatcher State Park.
Group at Lunch
Group at Lunch
Group Photo
Group Photo
Group at John Boyd Thatcher State Park with Helderberg Escarpment in the background.

 

Minnewaska State Park, NY

Lake Minnewaska
Lake Minnewaska
Lake Minnewaska - a natural, glacially sculpted lake on the crest of the Shawangunk ridge.
Shawangunk Conglomerate
Shawangunk Conglomerate
Beds of the Shawangunk Conglomerate, a pure quartz pebble conglomerate.
Glaciated Bedrock
Glaciated Bedrock
Bedrock surface at Lake Minnewaska showing glacial polish, chattermarks, and glacial striations.
Glaciated Bedrock Surface
Glaciated Bedrock Surface
Glaciated Bedrock Surface
Glaciated Bedrock Surface
Bedrock surface at Lake Minnewaska showing glacial polish, chattermarks, glacial grooves and glacial striations.
Glacial Polish
Glacial Polish
Glacially polished bedrock surface seen in low angle light.

Last modified 11-05-08 by J Bret Bennington. All rights reserved by the author. This document and images may not be distributed or posted in any format or reposted on any other server without permission. Permission is granted to download and display photos for educational purposes.
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