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Round, seed-like fossil out of Columbia MO


eldr62

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https://imgur.com/a/J0Twa

 

Originally posted on r/fossilid on reddit.com. Did not get much reception.

I literally know nothing about fossils except a few tidbits in recognizing basic things like crinoids. 

I do not remember exactly where it was found, but geologic maps indicate my area, Columbia, Missouri, is roughly in the carboniferous layer.

I'm sorry I don't have many good views of it--I do not have any good tools to readily chip away at it. 

 

Let me know if you guys have any more questions!

Thank you so much! 

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Crinoid or blastoid calyx? How big is it?

Btw here it is (for the people who don't want to look in that link?)

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D.N.FossilmanLithuania

If it is from Carboniferous, the determination is Trigonocarpid seed fern. :D

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1 hour ago, supertramp said:

maybe a leucite crystal in a volcanic rock

 

ciao

Agreed. Or Analcime.

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Could we have a closer look or larger file ? Those look like they could be crinoid bits to me.

I suspect this may be volcanic ash, which can be very fossiliferous.

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34 minutes ago, Rockwood said:

Could we have a closer look or larger file ? Those look like they could be crinoid bits to me.

I suspect this may be volcanic ash, which can be very fossiliferous.

I agree

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It is not a crystal in a volcanic rock. It is most likely an interior mold of a crinoid calyx surrounded by an empty space where the calcite calyx has dissolved away. Note numerous exterior molds of crinoid stems in a rock that is most likely a chert found in a limestone. Compare this rock to the similar cherts with molds  found in the Mississippian Redwall Limestone from Northern Arizona.

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2 hours ago, DPS Ammonite said:

It is not a crystal in a volcanic rock. It is most likely an interior mold of a crinoid calyx surrounded by an empty space where the calcite calyx has dissolved away. Note numerous exterior molds of crinoid stems in a rock that is most likely a chert found in a limestone. Compare this rock to the similar cherts with molds  found in the Mississippian Redwall Limestone from Northern Arizona.

I think this theory makes sense! I didn't realize those calices could get so large.

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3 hours ago, Rockwood said:

Could we have a closer look or larger file ? Those look like they could be crinoid bits to me.

I suspect this may be volcanic ash, which can be very fossiliferous.

I will try to take more pictures today! I tried to get a look underneath the rock lip, but my simple phone camera did not do it justice. 

I will also get some close-ups of the opposite side with all the crinoid imprints. 

 

Thank you, everyone, for all of your ideas and thoughts! I really appreciate it! This has already been a conversation piece and I would like to at least have some theories as to what it is. The geometric shape really throws me for a loop!

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Absolutely 100% an internal mold (steinkern) of a crinoid calyx. Given the locale, that is most likely the chert that lies within the Mississippian Burlington Fm. It's chock full of crinoid/blastoids like that.

 

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