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“Bite-Size Bits of Local, National, and Global History”
Rochester in Monroe County, New York — The American Northeast (Mid-Atlantic)
 

Genesee River Gorge: 20,000 Years in the Making

 
 
Genesee River Gorge: 20,000 Years in the Making Marker image. Click for full size.
By Yugoboy, September 12, 2012
1. Genesee River Gorge: 20,000 Years in the Making Marker
Inscription.
The Earth is Constantly Changing
Soils and sands get washed from mountainsides and settle into lakes and oceans where they are naturally compressed into layers of sedimentary rocks. The layers of rock are like pages of a book and tell the story of how and when they were made.

During the last Ice Age, giant sheets of ice, or glaciers, formed and covered parts of the earth. As these glaciers slid over the earth's surface, they carried rocks, soil and sand, carving out valleys and leaving deposits that formed into hills and mountains. As the glacial ice melted, the receding water formed lakes, which were drained by new rivers, spreading sand and soil and carrying them back to the oceans to form new rock layers.

Before you is a magnificent view of the Genesee River Gorge. The gorge or bowl was carved by the flowing waters of the Genesee River from layers of bedrock beneath it. These layers of different rocks, including shales, date back to the late Ordonician Period some 430 million years ago. Waters of the river began carving deeply into the bedrock at the end of the last glacial periods, called the Wisconsonian Ice Age, over 20,000 years ago.

During the Ice Age, water from the melting ice caps formed into three glacial lakes - Lake Scottsville, Dawson and Iroquois - that covered much of New
Genesee River Gorge: 20,000 Years in the Making Marker in situ with Conflict Marker image. Click for full size.
By Yugoboy, September 12, 2012
2. Genesee River Gorge: 20,000 Years in the Making Marker in situ with Conflict Marker
York State. Over 20,000 years, as water drained, the rivers that formed cut through the bedrock, creating waterfalls. The unique geology provided the immense water power that fueled Rochester's explosive growth.

The source of the Genesee River has been traced to Potter County, Pennsylvania. From there it flows northerly, about 155 miles into Lake Ontario. There was a time when the river flowed easterly to form Irondequoit Bay. Then glacial debris filled the river bed and eventually channeled the river to its present course. Honeoye and Irondequoit Creeks, in Southern Monroe County, follow the same course as the pre-glacial Genesee River to the mouth of Irondequoit Bay.

Looking at the sheer wall on your left, you can see the layers of shale from the Clinton Formation, which dates back over 400 million years to the Silurian Age, a time when sea life multiplied and animal life first appeared on land.

At the left edge of the falls, you can see brick remains of a plant that once supplied power to factories along the eastern bank. The man-made archway, cut into the rock, was once a storm sewer outlet.

When the glacial waters first carved out this gorge, the lip of High Falls was originally located almost one-half mile to the north. Even today, after millions of years, falling water continues to erode the bedrock, both at the falls and along
Genesee River Gorge: 20,000 Years in the Making Marker as seen facing East on the bridge image. Click for full size.
By Yugoboy, September 12, 2012
3. Genesee River Gorge: 20,000 Years in the Making Marker as seen facing East on the bridge
the gorge walls. When Francis Brown fist saw High Falls it towered some 96 feet, but 20th century flood control measures reduced the height in order to accommodate a greater volume of water.

Today the lip of the falls is only about 80 feet above the pool at its base.

On the right side of High Falls is a wing wall, a man-made structure that forced water into channels cut into the bedrock under the Gorsline Building foundations. At the base of the falls, a tail race cut into the rock allowed the same water to turn the water wheels and return to the river.

All along the west side of the gorge on the right, you can see a series of tail races cut into the bedrock, marking where 19th century industries were located. You can also see, on the lower level, a small, light brick building, which is one of only three plants on the river that still produces hydroelectric power. New York State Heritage Areas - a program of NYS Parks. City of Rochester, NY Brown's Race/High Falls Historic District
 
Erected by City of Rochester, NY - NYS Parks.
 
Location. 43° 9.773′ N, 77° 36.912′ W. Marker is in Rochester, New York, in Monroe County. Marker is on Platt St 0.1 miles west of Brown's Race, on the right when traveling east. Click for map
Genesee River Gorge: 20,000 Years in the Making Marker as seen facing West on the bridge image. Click for full size.
By Yugoboy, September 12, 2012
4. Genesee River Gorge: 20,000 Years in the Making Marker as seen facing West on the bridge
. Marker is located on the Pont de Rennes Bridge. The view of the falls is spectacular. Marker is in this post office area: Rochester NY 14614, United States of America.
 
Other nearby markers. At least 8 other markers are within walking distance of this marker. Genesee River Gorge: Centuries of Conflict in Pleasant Valley (here, next to this marker); The Genesee Brew House Building (about 300 feet away, measured in a direct line); On this site stood the Standard Brewing Company's main Brewery Building. (about 300 feet away); Pont de Rennes Pedestrian Bridge (about 700 feet away); Welcome to the High Falls (about 700 feet away); Original Site of Frederick Douglass Monument (approx. mile away); Morning of February 18, 1861 (approx. mile away); Genesee River Gorge: Industrial & Urban Development (approx. 0.3 miles away). Click for a list of all markers in Rochester.
 
Categories. EnvironmentIndustry & CommerceScience & MedicineWaterways & Vessels
 
 
Credits. This page originally submitted on , by Yugoboy of Rochester, New York. This page has been viewed 290 times since then and 22 times this year. Photos:   1, 2, 3, 4. submitted on , by Yugoboy of Rochester, New York. • Bill Pfingsten was the editor who published this page. This page was last revised on June 16, 2016.
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