File:98k061 8mp Falls of the Ohio (6556669259).jpg
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editDescription98k061 8mp Falls of the Ohio (6556669259).jpg |
English: Looking SSE from big rock mound between Big and Little Sloughs at Falls of Ohio:
Upper gates of McAlpine Dam and Conrail (L&I) Bridge in distance. Seen here is the limestone bedrock which forms the Falls of the Ohio. The coralline zone is the lowest layer of the Jeffersonville Limestone (named for the nearby city), which in this area is about 25 to 35 feet thick, depending on where it is measured. The coralline zone is about 8 to 11 feet thick and is named for the many species of fossil coral found in it. This limestone dates back to the middle Devonian Period, about 375 million years ago, when the continental plates were arranged much differently than today. The Falls area at that time was nearer to the equator, the bed of a shallow tropical sea, somewhat like the Bahamas today. Many of the animals in the sea had calcium carbonate shells or skeletons which settled to the bottom when they died. Together with the waste products of living animals, the remains formed a sediment which over time lithified into limestone. Much later in geological time, during the last 10,000 years, the Ohio River eroded down through glacial deposits until it reached the limestone bedrock seen at the Falls. Before the dam was built, the bedrock was exposed at low water across the entire width of the Ohio River, forming rapids about 2 miles long with a drop of about 26 feet. These rapids, known as the Falls of the Ohio, were a natural barrier to navigation and stimulated the early development of Louisville, Jeffersonville, Clarksville and New Albany. See also: Falls of the Ohio Educator's Handbook (PDF). Fossil Beds of the Falls of the Ohio (PDF). Powell, Richard L., 1970 (revised 1999). Geology of the Falls of the Ohio River: Indiana Geological Survey Circular 10. Conkin, James E., and Conkin, Barbara M., 1980. Handbook of Strata and Fossils at the Falls of the Ohio: University of Louisville Studies in Paleontology and Stratigraphy. Ohio River mile 605. Louisville, Kentucky. (accessible from Clarksville, Indiana). 14-Nov-1998. File # 98k061. _____________. . Kodak PRN-2 (Pro 100), 6x9 cm. Epson V500 scanner; Vuescan software. |
Date | |
Source | 98k061_8mp: Falls of the Ohio |
Author | William Alden from Louisville, Kentucky, USA |
Camera location | 38° 16′ 23.56″ N, 85° 46′ 00.59″ W ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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This image was originally posted to Flickr by Bill Alden at https://flickr.com/photos/70020260@N04/6556669259 (archive). It was reviewed on 27 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
27 November 2019
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current | 21:41, 27 November 2019 | ![]() | 3,617 × 2,400 (2.84 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Epson |
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Camera model | PerfectionV500 |
Author | William Alden III |
Copyright holder | William Alden III |
Horizontal resolution | 150 dpi |
Vertical resolution | 150 dpi |
Y and C positioning | Co-sited |
Pair of black and white reference values |
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Exif version | 2 |
Meaning of each component |
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Supported Flashpix version | 1 |
Color space | sRGB |