Near Voorheesville in Albany County, New York — The American Northeast (Mid-Atlantic)
The Indian Ladder Trail
Geologists believe that the Helderberg Escarpment existed before the Pleistocene or glacial period, which began about 1.6 million years ago. Though many cliffs were created by glaciers, this cliff was actually protected by the ice, which could not move up the vertical rock wall. Only the ice above the escarpment was in motion, carving striations across the surface rock and dropping foreign rocks from other regions, known as glacial erratics. As the last ice sheet retreated about 10,000 years ago, meltwater flooded the valley, forming glacial Lake Albany, eventually the lake water was drained through the Hudson River.
Location. 42° 39.157′ N, 74° 0.722′ W. Marker is near Voorheesville, New York, in Touch for map. The marker is in Thatcher Park, mounted on the cliff face and can be viewed from the steps that descend to the Indian Ladder Trail. Marker is in this post office area: Voorheesville NY 12186, United States of America.
Other nearby markers. At least 8 other markers are within 2 miles of this marker, measured as the crow flies. The Tory Cave (within shouting distance of this marker); Thacher Point (approx. ¼ mile away); Tory Cave 1777 (approx. 0.3 miles away); Indian Ladder (approx. 0.3 miles away); Helderbergs (approx. 0.9 miles away); Locust Vale School (approx. 1½ miles away); Knox School #5 (approx. 1.8 miles away); Frederick Crounse (approx. 2 miles away). Touch for a list and map of all markers in Voorheesville.
More about this marker. On the left is a photo with the caption, "The softer layer of limestone erodes before the harder layers above and below it. Many caves are formed in this layer."
On the right is an illustration with the caption, "When glaciers retreated approximately 11,000 years ago, the valleys filled with meltwater, forming glacial lakes."
Also see . . . Thacher State Park (John Boyd Thacher). New York State Office of Parks, Recreation and Historic Preservation (Submitted on June 29, 2011, by Bernard Fisher of Mechanicsville, Virginia.)
Additional keywords. Thatcher Park, John Boyd Thatcher Park
Categories. • Environment •
Credits. This page was last revised on June 16, 2016. This page originally submitted on June 27, 2011, by Howard C. Ohlhous of Duanesburg, New York. This page has been viewed 1,970 times since then. Photos: 1, 2, 3, 4. submitted on June 27, 2011, by Howard C. Ohlhous of Duanesburg, New York. • Bernard Fisher was the editor who published this page.