RodT Posted September 20, 2023 Share Posted September 20, 2023 Hi everyone, New here! I recently found these a few weeks ago in the Badlands of Eastern Montana, in what I believe would be 'Hell Creek' formation. For clarities sake, my knowledge level is very low, and I'm not looking to sell anything. I hope the photos aren't too confusing visually. The posted photos are of 2 ea. fossils. I found these at the bottom of a canyon while out on a hike. They weren't poking out of deposit per se, but were rather tumbling down the drainage out of a hill side/feature. There were quite a few more pieces laying around where I found these. They are very heavy, hard, and have the feel and 'ring' of fired clay/ceramic. Also, both of them are two-sided, interestingly, as if they are the remains of something that was sort of piled up - or maybe 2-sided indeed. I did some googling and found nothing that resembles them. I did actually join today to get some help in IDing these form all you folks, but this is a VERY cool forum and, I think I will enjoy spending a bit of time here. Thanks a lot for any knowlege that is offered up. Your help is much appreciated! Rod 5 Link to comment Share on other sites More sharing options...
digit Posted September 20, 2023 Share Posted September 20, 2023 They are very cool looking but they appear to be textbook texture for septarian concretions (or impressions of a septarian concretion). These concretions fracture into an interesting geometric pattern that often infill with nice silica material which makes slices of these concretions quite beautiful. https://en.wikipedia.org/wiki/Concretion#Septarian_concretions https://www.google.com/search?q=septarian+concretion&tbm=isch Cheers. -Ken 2 Link to comment Share on other sites More sharing options...
Bobby Rico Posted September 20, 2023 Share Posted September 20, 2023 Really cool, I guess it could be Counter Septarian structures but I am probably wrong 1 4 Link to comment Share on other sites More sharing options...
ThePhysicist Posted September 20, 2023 Share Posted September 20, 2023 I found these while on my own romp in the HCF earlier this Summer; they're ironstone nodules. ^ https://www.dmr.nd.gov/ndgs/ndnotes/concretions/ 2 "Argumentation cannot suffice for the discovery of new work, since the subtlety of Nature is greater many times than the subtlety of argument." - Carl Sagan "I was born not knowing and have had only a little time to change that here and there." - Richard Feynman Collections: Hell Creek Microsite | Hell Creek/Lance | Dinosaurs | Sharks | Squamates | Post Oak Creek | North Sulphur River | Lee Creek | Aguja | Permian | Devonian | Triassic | Harding Sandstone Instagram: @thephysicist_tff Link to comment Share on other sites More sharing options...
Fossildude19 Posted September 20, 2023 Share Posted September 20, 2023 Counter Septarian structures for me, too. See this topic: 1 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Mark Kmiecik Posted September 20, 2023 Share Posted September 20, 2023 Fragments of a counterseptarian structure. 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...
DPS Ammonite Posted September 21, 2023 Share Posted September 21, 2023 1 hour ago, Fossildude19 said: Counter Septarian structures for me, too. See this topic: One of the most memorable threads ever on The Forum. Take a look at it. 1 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...
Angela64 Posted September 21, 2023 Share Posted September 21, 2023 super cool! Link to comment Share on other sites More sharing options...
grandpa Posted September 21, 2023 Share Posted September 21, 2023 Welcome to the forum. These are really cool; Nature's ART! 1 2 Link to comment Share on other sites More sharing options...
RodT Posted September 21, 2023 Author Share Posted September 21, 2023 Wow! That didn't take long. So Septarian Concretion it is then. And yes, fascinating thread about the one found in Oregon. I had no idea that geological phenomenon could create something that looks like this. Did a little research and all makes perfect sense for the area and relative age that is known. Thanks everyone for responding. Much appreciated. Rod Link to comment Share on other sites More sharing options...
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