deutscheben Posted September 24, 2017 Share Posted September 24, 2017 These two finds are in one piece of rock found in some roadside rip rap in Kankakee County, Illinois. Based on other fossils I found and knowing what is exposed in quarries nearby, I believe they are from the Silurian Racine Formation. I have never worked with dolomite before, so I would also love to hear any prep advice you have, as well as IDs! The first seems to be a couple of pleura from a Gravicalymene, but is it likely there is more there? The second one has me puzzled- is it a trilobite part, or maybe a brachiopod? It seems like it is symmetrical, but covered by the matrix. Thanks! Link to comment Share on other sites More sharing options...
westcoast Posted September 24, 2017 Share Posted September 24, 2017 Second one is a brachiopod as you suspected. Not sure about the first. 1 Link to comment Share on other sites More sharing options...
Rockwood Posted September 24, 2017 Share Posted September 24, 2017 The first one looks like a hyolith. It could also be something else that is exposed in an odd way. Perhaps a hinge line. 1 Link to comment Share on other sites More sharing options...
aek Posted September 24, 2017 Share Posted September 24, 2017 The dolomite from that area can be very difficult to work with, but I find the best way is to use a wide chisel and a sledgehammer to split open. 1 Link to comment Share on other sites More sharing options...
deutscheben Posted September 24, 2017 Author Share Posted September 24, 2017 Thanks @westcoast, @Rockwood and @aek! Link to comment Share on other sites More sharing options...
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