sdnomad Posted August 26, 2022 Share Posted August 26, 2022 (edited) Not sure if this rock is a fossil or unique mineral deposit that created uniform circles within the rock. My amateur guess would be maybe coral fossil? Edited August 26, 2022 by sdnomad Link to comment Share on other sites More sharing options...
Ludwigia Posted August 26, 2022 Share Posted August 26, 2022 Exactly where did you find it? Could be agate. 1 3 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Rockwood Posted August 26, 2022 Share Posted August 26, 2022 I'm pretty sure this isn't coral. It has a fossilish look, but I suspect it is only agate. 1 1 Link to comment Share on other sites More sharing options...
Misha Posted August 26, 2022 Share Posted August 26, 2022 Maybe some kind of orbicular Jasper? 1 1 Link to comment Share on other sites More sharing options...
sdnomad Posted August 27, 2022 Author Share Posted August 27, 2022 23 hours ago, Ludwigia said: Exactly where did you find it? Could be agate. Found it in the badlands of South Dakota. 1 Link to comment Share on other sites More sharing options...
Rockwood Posted August 27, 2022 Share Posted August 27, 2022 7 minutes ago, sdnomad said: Found it in the badlands of South Dakota. Agate is found in that area. 1 Link to comment Share on other sites More sharing options...
Mark Kmiecik Posted August 27, 2022 Share Posted August 27, 2022 It looks geological to me. Beautiful specimen! Mark. Fossil hunting is easy -- they don't run away when you shoot at them! Link to comment Share on other sites More sharing options...
abyssunder Posted August 27, 2022 Share Posted August 27, 2022 Geological, I agree. Nice specimen! " 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...
DPS Ammonite Posted August 27, 2022 Share Posted August 27, 2022 (edited) Might want to cut it. South Dakota has some nice agates: Fairburn and Prarie Agates. https://en.m.wikipedia.org/wiki/Fairburn_Agate https://www.sdakotabirds.com/rockhound/prairie_agates.htm https://www.sdakotabirds.com/blog/archives/tag/prairie-agate Edited August 27, 2022 by DPS Ammonite My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
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