splagh Posted October 2, 2017 Share Posted October 2, 2017 at first glance it seemed molluscan but now that i've brushed dirt away it appears to be some form of coral. structure is hard to place. found in area where i've also encountered tabulate and rugosa Link to comment Share on other sites More sharing options...
ynot Posted October 2, 2017 Share Posted October 2, 2017 Coins do not make a good scale, please use a ruler. It looks like a rugose coral to Me. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
westcoast Posted October 2, 2017 Share Posted October 2, 2017 I agree with ynot. Coins with weird eyes are particularly unhelpful☺ Link to comment Share on other sites More sharing options...
Rockwood Posted October 2, 2017 Share Posted October 2, 2017 I trust in science that it is indeed a horn coral. Never seen a coin that would be out of the scale range. Link to comment Share on other sites More sharing options...
FossilDAWG Posted October 2, 2017 Share Posted October 2, 2017 Rugosan coral is certainly the correct ID, as far as it goes. The Franklin Mountains contain rocks from several Paleozoic periods. There is a complete section of the Ordovician Montoya Group, exposed for example along Senic Drive, and tabulate and a few rugosan corals are common at some levels. However the only rugosans are solitary horn corals (Grewingkia, Streptelasma, Bighornia) with an internal structure that lack dissepiments (crescent-shaped structures along the outside wall). Your specimen seems to have dissepiments (though it is hard to be absolutely certain) so I don't think it is any of the Ordovician forms. Mississippian, Pennsylvanian, and some Permian rocks are exposed in parts of the Franklin Mountains and one of these may have been the source of your fossil. Perhaps if you can post some photos of other fossils you have found associated with your coral we may be able to pin down an age with more confidence. Don 2 Link to comment Share on other sites More sharing options...
splagh Posted October 3, 2017 Author Share Posted October 3, 2017 I can do you a little better. I found it here 31.945747, -106.510087 (i marked it on my phone in gmaps) though it was in a (whats the word for it) rock slide consisting of different strata. I found this on the same hill. and this in the ravine a few dozen yards southeast. it's not very dense and likely washed in from far up. Link to comment Share on other sites More sharing options...
splagh Posted October 3, 2017 Author Share Posted October 3, 2017 this is from a different trip to the same area. i found it on top of the adjacent foothill (is that what they're called) roughly here 31.942068, -106.507796 (didnt tag it at the time) https://imgur.com/a/kaUgw big pictures. Link to comment Share on other sites More sharing options...
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