BLT Posted July 25, 2018 Share Posted July 25, 2018 Hello, I found this in a creek in middle Tennessee. Is it a concretion or some type of fossil? Link to comment Share on other sites More sharing options...
ynot Posted July 25, 2018 Share Posted July 25, 2018 Could be a sponge, or a chert nodule, or both. 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...
BLT Posted July 25, 2018 Author Share Posted July 25, 2018 Thank you for your reply, @ynot. If it was a sponge, which type would it be? (I didn’t realize sponges could look similar to this.) How could it be both a chert nodule and a sponge? Link to comment Share on other sites More sharing options...
ynot Posted July 25, 2018 Share Posted July 25, 2018 I do not know sponges enough to say one way or the other. (But it does look like some I have seen here on TFF.) Maybe @Spongy Joe can help. Many concretions will form around a nucleus of organic material. (Mason creek siderite nodules are a classic example.) Some sponges have a silicate "skeleton" (glass sponges) that can act as a nucleus for the formation of a chert nodule. 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...
BLT Posted July 25, 2018 Author Share Posted July 25, 2018 Hmm. Thanks, @ynot. I’ve always thought sponges had to have a “spongey” appearance. I’m now wondering if this next picture is a sponge or not? Link to comment Share on other sites More sharing options...
ynot Posted July 25, 2018 Share Posted July 25, 2018 20 minutes ago, BLT said: I’m now wondering if this next picture is a sponge or not? 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...
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