This first fossil picture shows one of the largest horn corals to ever exist called Siphonophrentis elongata (Rafenesque & Clifford, 1820). It is found in the Jeffersonville Limestone usually in pieces in the soil. The fossil shown is stained a reddish-brown. The other two plates are broken up crinoid stem plates with one showing pieces of a calyx. They were found at Lake Cumberland, Kentucky. They appear to have layers of lake mud on them that is fused to the silica fossils. I like these fossils in that they have bluish look to them.
The next two show after cleaning. The crinoid stem piece did the best. I am not sure there was much change on the crinoid plates.
This next picture is of a coral fossil and brachiopod plate. The second image shows the cleaned fossils. The coral cleaned quite nicely.
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