Looking SE from <a href="https://en.wikipedia.org/wiki/Falls_of_the_Ohio_National_Wildlife_Conservation_Area" class="extiw" title="w:Falls of the Ohio National Wildlife Conservation Area">Falls of the Ohio</a>.
<p>Fossiliferous limestone slabs and shallow pool near McAlpine Dam (at right).
Conrail (later L&amp;I) Bridge in distance.
</p><p>Seen here is the <a href="https://en.wikipedia.org/wiki/limestone" class="extiw" title="w:limestone">limestone</a> bedrock which forms the <a href="https://en.wikipedia.org/wiki/Falls_of_the_Ohio_National_Wildlife_Conservation_Area" class="extiw" title="w:Falls of the Ohio National Wildlife Conservation Area">Falls of the Ohio</a>. [Much of the rock in this photo is in the form of slabs which may have been dumped here during dam construction.] The coralline zone is the lowest layer of the <a href="https://en.wikipedia.org/wiki/Jeffersonville_Limestone" class="extiw" title="w:Jeffersonville Limestone">Jeffersonville Limestone</a> (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 <a href="https://en.wikipedia.org/wiki/fossil" class="extiw" title="w:fossil">fossil</a> <a href="https://en.wikipedia.org/wiki/coral" class="extiw" title="w:coral">coral</a> found in it. This limestone dates back to the middle <a href="https://en.wikipedia.org/wiki/Devonian" class="extiw" title="w:Devonian">Devonian Period</a>, about 375 million years ago, when the <a href="https://en.wikipedia.org/wiki/Plate_tectonics" class="extiw" title="w:Plate tectonics">continental plates</a> 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 <a href="https://en.wikipedia.org/wiki/Lithification" class="extiw" title="w:Lithification">lithified</a> into limestone. Much later in geological time, during the last 10,000 years, the <a href="https://en.wikipedia.org/wiki/Ohio_River" class="extiw" title="w:Ohio River">Ohio River</a> eroded down through <a href="https://en.wikipedia.org/wiki/Till" class="extiw" title="w:Till">glacial deposits</a> 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 <a href="https://en.wikipedia.org/wiki/rapids" class="extiw" title="w:rapids">rapids</a> 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.
</p><p>See also:
</p><p><a rel="nofollow" class="external text" href="https://www.fallsoftheohio.org/wp-content/uploads/2016/09/Educators-Handbook.pdf">Falls of the Ohio Educator's Handbook (PDF)</a>.
</p><p><a rel="nofollow" class="external text" href="http://kgs.uky.edu/kgsweb/olops/pub/kgs/KGSXISP19reduce.pdf">Fossil Beds of the Falls of the Ohio (PDF)</a>.
</p><p>Powell, Richard L., 1970 (revised 1999). <i>Geology of the Falls of the Ohio River</i>: Indiana Geological Survey Circular 10.
</p><p>Conkin, James E., and Conkin, Barbara M., 1980. <i>Handbook of Strata and Fossils at the Falls of the Ohio</i>: University of Louisville Studies in Paleontology and Stratigraphy.
</p><p>Ohio River mile 605.
Kentucky owns the river, but the Falls are accessible from Clarksville, Indiana.
Aug. 1987.
File # 87h034.
.
35 mm E-6 slide
I can't see the edge of the film inside the slide mount, but this looks like Fuji Velvia, with those hypersaturated colors.
scanned with Plustek OpticFilm 7600i and Silverfast 8.
</p>
edited with Picture Window 4
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/70020260@N04">William Alden</a> from Louisville, Kentucky, USA
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bill_alden/7316656018/">87h034: Falls of the Ohio</a>