Innocentx Posted September 19, 2018 Share Posted September 19, 2018 These are the most numerous former inhabitants(that can be seen with naked eye) in an area I'm studying. Cottonwood Fm, lower Permian, Flint Hills Kansas. There's an odd feature at the anterior end that may help ID it. Would these indicate shallow water environment? "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
ynot Posted September 19, 2018 Share Posted September 19, 2018 Can't help, just wanted to say- nice clams. 2 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...
Tidgy's Dad Posted September 19, 2018 Share Posted September 19, 2018 Lovely bivalves. I thought about Leinzia, but I don't think it's right. Interesting. 1 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Herb Posted September 19, 2018 Share Posted September 19, 2018 maybe a species of Phestia ? 1 "Absence of evidence is not evidence of absence"_ Carl Sagen No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go. " I think, therefore I collect fossils." _ Me "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes "can't we all just get along?" Jack Nicholson from Mars Attacks Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 20, 2018 Share Posted September 20, 2018 I do not know what kind of clam they are. They are internal molds, AKA steinkerns. 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...
Innocentx Posted September 20, 2018 Author Share Posted September 20, 2018 14 hours ago, DPS Ammonite said: They are internal molds, AKA steinkerns. That explains the odd feature at the end, I guess. The interesting thing is that there's very little shell material on any of the fossils in that area. Most are internal molds with a bit or no shell remaining. Is there some process that causes that? Would it be safe to say these are Allorisma? "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
ynot Posted September 20, 2018 Share Posted September 20, 2018 7 minutes ago, Innocentx said: Is there some process that causes that? Acidic water percolating through the rock will dissolve the calcium of the shell and carry it away. 1 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...
Max-fossils Posted September 20, 2018 Share Posted September 20, 2018 Nice steinkerns! They seem rather normal to me... I'm not sure what you mean with the weird feature. If it's that kinda thick "line" running down the middle of the bivalve in the second picture, I think that may be due to the shell not being perfectly well closed during fossilization. So the steinkern also "steinkernized" (no, that's not a real word ) in between the small opening, creating that line sticking out. 1 Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
Innocentx Posted September 20, 2018 Author Share Posted September 20, 2018 13 minutes ago, Max-fossils said: I'm not sure what you mean with the weird feature. It's the triangular bit at the left end, second photo. It's steinkern so it's an interior hinge feature with a purpose mysterious to me. I've not seen this on other bivalves. 1 "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 20, 2018 Share Posted September 20, 2018 1 hour ago, Innocentx said: Would it be safe to say these are Allorisma? Allorisma is a good guess, but maybe not safe. The genus may have been replaced with Wilkingia. You/we will need to find literature on the fossils of the Cottonwood Formation to see what bivalves occur in order to give a better ID. 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...
Innocentx Posted September 20, 2018 Author Share Posted September 20, 2018 Just now, DPS Ammonite said: find literature on the fossils of the Cottonwood Formation I have definitely been up to that and have found some interesting stuff. I will continue. "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 20, 2018 Share Posted September 20, 2018 Check out Geolex for references: https://ngmdb.usgs.gov/Geolex/UnitRefs/CottonwoodRefs_7728.html It appears the Cottonwood Limestone is a member of the Beattie Formation. 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...
Max-fossils Posted September 20, 2018 Share Posted September 20, 2018 1 hour ago, Innocentx said: It's the triangular bit at the left end, second photo. It's steinkern so it's an interior hinge feature with a purpose mysterious to me. I've not seen this on other bivalves. Oh that. I think that may be due to where the muscle lay. Some bivalves simply have a much bigger muscle than others. Perhaps the muscle fossilized first in a different substance, and then went away, leaving only an empty space. But then again I'm not sure that's possible because soft tissues don't fossilize (well). Perhaps it's simply due to the internal structure of the shell itself. Sometimes there are those "bumps" inside bivalves, I've noticed them sometimes being very "inflated" in shells like Spisula subtruncata (only some specimens). But you're right. That does look really weird. I wonder what it is too! 1 Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
Innocentx Posted September 20, 2018 Author Share Posted September 20, 2018 24 minutes ago, Max-fossils said: Perhaps it's simply due to the internal structure of the shell itself. I think that's it. 1 "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
Max-fossils Posted September 20, 2018 Share Posted September 20, 2018 3 minutes ago, Innocentx said: I think that's it. It is more realistic than my muscle scar theory I was just a little confused because the place where the dents are is pretty much exactly where the muscles would lie. 1 Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
Innocentx Posted September 20, 2018 Author Share Posted September 20, 2018 38 minutes ago, DPS Ammonite said: It appears the Cottonwood Limestone is a member of the Beattie Formation. Yes, it's a member and I've been calling it wrong. If I didn't live so far away from everything I could take a geology course, but it's 30 miles each way, 10 of it on bad road. I'm reading "Kansas Geology" at this time. "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
Xiphactinus Posted September 20, 2018 Share Posted September 20, 2018 @Innocentx You might find this helpful and interesting: http://www.kgs.ku.edu/Publications/Bulletins/162/03_strat_c.html 2 Link to comment Share on other sites More sharing options...
Innocentx Posted September 20, 2018 Author Share Posted September 20, 2018 Thanks @Xiphactinus. KGS is among my favorite resources. "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
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