Renfro85 Posted October 10, 2018 Share Posted October 10, 2018 I also found this tiny little guy. I’m trying to reinvigorate my childhood obsession with all things geological, so excuse my ignorance. 2 questions: (1) what is this black clay at arbor hills called? And (2) is this tiny shell from a month ago or something older? I don’t know enough about the clay to make heads or tails of this. Link to comment Share on other sites More sharing options...
Renfro85 Posted October 10, 2018 Author Share Posted October 10, 2018 I found this tiny little guy at Arbor Hills in Plano, Texas. I’m trying to reinvigorate my childhood obsession with all things geological, so excuse my ignorance. 2 questions: (1) what is this black clay at arbor hills called? It’s very prevalent/everywhere. And (2) is this tiny shell from a month old or something older? I don’t know enough about the clay to make heads or tails of this. P.S.- heck he still could have been living for all I know (I know very little) but seriously I wish I wouldn’t have walked away from this stuff/study at such a young age—so cool! Link to comment Share on other sites More sharing options...
jhw Posted October 10, 2018 Share Posted October 10, 2018 I don't know about the geology of that area, but it certainly looks like a nice little fossil brachiopod. I'd say hero! I'm sure the experts can add more info. Link to comment Share on other sites More sharing options...
ynot Posted October 10, 2018 Share Posted October 10, 2018 Nice brachiopod. The rock looks like a shale type of rock. 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...
jhw Posted October 10, 2018 Share Posted October 10, 2018 Maybe something along the lines of Orthostrophia parva. Different matrix, but shell looks similar. This one's from Oklahoma. Link to comment Share on other sites More sharing options...
DPS Ammonite Posted October 10, 2018 Share Posted October 10, 2018 The dark shale is part of the Cretaceous Arcadia Park Formation of the Eagle Ford Group. Nice shell fossil. Never seen one like it from that formation. It could also be a bivalve. There is a similiar brachiopod from the lower Austin chalk whose name escapes me. What you have could also be from the transition zone between the uppermost Arcadia Park Formation and the lower part of the Austin Chalk (Atco Formation) where bivalves are more common. What other fossils did you find with the shell? Any ideas? @JohnJ @Uncle Siphuncle@BobWill 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...
abyssunder Posted October 10, 2018 Share Posted October 10, 2018 Good point, John. I thought it might be a bivalve, but I was restrained, not saying it's not a 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...
Renfro85 Posted October 11, 2018 Author Share Posted October 11, 2018 5 hours ago, DPS Ammonite said: The dark shale is part of the Cretaceous Arcadia Park Formation of the Eagle Ford Group. Nice shell fossil. Never seen one like it from that formation. It could also be a bivalve. There is a similiar brachiopod from the lower Austin chalk whose name escapes me. What you have could also be from the transition zone between the uppermost Arcadia Park Formation and the lower part of the Austin Chalk (Atco Formation) where bivalves are more common. What other fossils did you find with the shell? Any ideas? @JohnJ @Uncle Siphuncle@BobWill This was just a chance find while walking through the park/picking things up here and there and no other fossils were found. I thought I’d found petrified wood but turns out it was calcite slickenside. This particular piece of shale was picked up from the creek itself. Here are are some additional images I took tonight that may help: Link to comment Share on other sites More sharing options...
Renfro85 Posted October 11, 2018 Author Share Posted October 11, 2018 7 hours ago, jhw said: Maybe something along the lines of Orthostrophia parva. Different matrix, but shell looks similar. This one's from Oklahoma. Actually they look quite similar! Let me know if the pic below helps pin it down further:) Link to comment Share on other sites More sharing options...
Max-fossils Posted October 12, 2018 Share Posted October 12, 2018 Cool find!!! I myself really can't tell either whether it's a brachiopod or a bivalve... The first picture looks like brachiopod, but the more recent pictures make me think of bivalve... Very weird! If it is a bivalve, then it is most likely a shell from the Cardiidae (the cockles). Pectinidae (scallops) also seems like a possibility, but I think that your shell isn't "flat'' enough for that. 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...
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