PrairieRox Posted July 31, 2017 Share Posted July 31, 2017 Found this on the side slope of an old road cut near the Cheyenne River in western South Dakota this morning...my first thought was turtle but after looking at fossilized turtle pics on line I don't think so. Could it be a dinosaur egg? It is about 18" long by 12" wide. When I grasped it and pulled on it it started separating into chunks as you can see in the second photo, and what looks like it could be the outer shell started separating from the outer portion (some pieces can be seen in the dirt to the right of the fossil(?) in question. Any help with ID would be greatly appreciated. Thanks! Link to comment Share on other sites More sharing options...
Miocene_Mason Posted July 31, 2017 Share Posted July 31, 2017 It's a concretion, maybe a septarian nodule. Sorry, not a fossil. 2 “...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin Happy hunting, Mason Link to comment Share on other sites More sharing options...
jpc Posted July 31, 2017 Share Posted July 31, 2017 Hi PR- This is a typical Pierre Shale concretion. They are very common in that rock layer, but better yet, they are where you find ammonites in the Pierre Shale. They are also often empty, devoid of fossils. 4 Link to comment Share on other sites More sharing options...
Miocene_Mason Posted July 31, 2017 Share Posted July 31, 2017 Eggs will have a bumpy outer layer btw. 1 “...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin Happy hunting, Mason Link to comment Share on other sites More sharing options...
PrairieRox Posted July 31, 2017 Author Share Posted July 31, 2017 Thanks a bunch! Link to comment Share on other sites More sharing options...
Miocene_Mason Posted July 31, 2017 Share Posted July 31, 2017 13 minutes ago, PrairieRox said: Thanks a bunch! Your welcome a bushel always happy to help, keep looking round there, could get an ammonite! “...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin Happy hunting, Mason Link to comment Share on other sites More sharing options...
abyssunder Posted August 1, 2017 Share Posted August 1, 2017 That's a septarian type concretion/nodule. Nice one. " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
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