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wpotterw
spending too much on rocks
Member since September 2016
Posts: 446 
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Post by wpotterw on Jun 25, 2020 16:28:29 GMT -5
I found this odd rock sticking up out of a local creek's gravel bank. I initially I though it was a fossil sponge. It appears to be made of a limestone material. It doesn't look like any of the concrete I see in the area. I can't find anything like it in my fossil books or online. Do you think it's natural or man-made? The local area is cretaceous with Austin chalk and the Marl groups. Mosrly small marine fossils in the area and the occasional mosasaur.   Could be a bryozoan. |
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kyoti
has rocks in the head
Member since June 2020
Posts: 542
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Post by kyoti on Jun 26, 2020 7:15:44 GMT -5
Thank you for the reply. It does look like the Hallopora picture online. My friend suggested it might be slag of some kind too. The rock has a certain odd structure to it but it's very light like a pumice.
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Post by fernwood on Jun 26, 2020 8:12:32 GMT -5
Can you see any uniform cell structure that would indicate an organic nature?
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Post by pauls on Jun 26, 2020 17:18:39 GMT -5
It does look organic but it could just be Tufa.
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kyoti
has rocks in the head
Member since June 2020
Posts: 542
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Post by kyoti on Jun 27, 2020 8:20:26 GMT -5
Hmmm there is structure to it like a cut sea sponge but I wouldn't call it uniform nor does it look like animal cells. Here's a close up of it.  |
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Fossilman
Cave Dweller 
Member since January 2009
Posts: 20,723
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Post by Fossilman on Jun 27, 2020 10:06:18 GMT -5
Doesn't quit have the same structure as a fossil sponge... But it's not man made either...
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Post by pauls on Jun 27, 2020 16:46:33 GMT -5
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kyoti
has rocks in the head
Member since June 2020
Posts: 542
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Post by kyoti on Jun 28, 2020 8:18:16 GMT -5
Thanks for the link Pauls. It could very well be Tufa. There is both limestone and tan, grey and even black marble like material in the area. The fossils I find in the area are mostly shellfish like Gryphaea and Rudist corals. The not-sponge was so odd and immediately caught my eye. I'm still going to keep it since it's so unusual.  I have an eclectic taste in rocks. |
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I have an eclectic taste in rocks. 
