gdsfossil Posted December 5, 2020 Share Posted December 5, 2020 Still learning my formations. Found these close to the bottom of the Dakota Sandstone formation in Kansas. Link to comment Share on other sites More sharing options...
Plantguy Posted December 5, 2020 Share Posted December 5, 2020 (edited) Looks to be either a fragmented cobble which has come apart (see arrows I added in your picture showing pieces shed from it) or perhaps a concretion. Seems to show lots of finer grained material all around it of different sizes as well. Are those all surface rocks or are they/some embedded in a matrix/the formation? Is that a conglomerate? Did you collect any concretions from this area? Any have fossils? I bought a couple concretions awhile back that had some very nice plant fossils.... This article discusses a basal conglomerate in Kansas 1 January 2007The Cretaceous basal conglomerate in Kansas Daniel F. Merriam Author Affiliations + Transactions of the Kansas Academy of Science, 110(3):179-186 (2007). https://doi.org/10.1660/0022-8443(2007)110[179:TCBCIK]2.0.CO;2 https://bioone.org/journals/transactions-of-the-kansas-academy-of-science/volume-110/issue-3/0022-8443(2007)110[179%3ATCBCIK]2.0.CO%3B2/The-Cretaceous-basal-conglomerate-in-Kansas/10.1660/0022-8443(2007)110[179:TCBCIK]2.0.CO;2.full Regards, Chris Edited December 5, 2020 by Plantguy added photo 3 Link to comment Share on other sites More sharing options...
LordTrilobite Posted December 5, 2020 Share Posted December 5, 2020 Looks a bit lumpy. Which makes me think these are not bones. But bones can often have concretions on them. Sometimes entirely enclosing them. Closeups would be helpful. The best way to tell is if you can find a broken piece. In a cross section you'll see bone structure if it's really bone. 3 Olof Moleman AKA Lord Trilobite Link to comment Share on other sites More sharing options...
ParkerPaleo Posted December 5, 2020 Share Posted December 5, 2020 +1 for looking at a cross section of any nodule. I worked on the Silvisaurus skull from the Dakota sandstone when I was at KU. It definitely had a concretion (with lots of iron) around it. Link to comment Share on other sites More sharing options...
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