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Same pattern on many rocks?


BuddingPaleo

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Does anyone know what this pattern is from? It is on the surface of a large number of rocks in the area. Those rocks are always rich with fossils, if that's pertinent. Is it from sponge? Shell? Its circles in oval-ish shapes. Its hard to get it to show on camera,  sorry. When I go outside today I'll try and get a pic of one in situ if you think that might help. (In sw Florida.) 

20180607_113415.jpg

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In my opinion, those are predominantly sponge borings, so they are trace fossils known as Entobia.

 

20180607_113415.jpg.b79559b75fdf8ca6d145dd93cbc7f0c0.jpg.4e594656becba19cda6031d4a5bfa1c8.jpgEntobia-bivalve-1-exterior-Prairie-Bluff-Chalk-Formation.jpg.2da48422f24c3aeff5d6653cb8bbc09e.jpg

comparative picture from here

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" 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. "

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Your awesome pic reminded me of this. I thought it was from coral. Now not so sure. Think this guy could have made my kinds of marks? He's a little under a half inch, impossible for me to get a size gauge on it...darn crevices! If so, I'll keep them together for reference.

20180608_111608.jpg

20180608_111649.jpg

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Just now, BuddingPaleo said:

Your awesome pic reminded me of this. I thought it was from coral. Now not so sure. Think this guy could have made my kinds of marks? He's a little under a half inch, impossible for me to get a size gauge on it...darn crevices! If so, I'll keep them together for reference.

20180608_111608.jpg

20180608_111649.jpg

Those are plates of an echinoid, two pieces where spines were attached. 

Image result for echinoid picture

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MOTM.png.61350469b02f439fd4d5d77c2c69da85.png.a47e14d65deb3f8b242019b3a81d8160-1.png.60b8b8c07f6fa194511f8b7cfb7cc190.png

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Just see the new photo, and I agree with Adam about echinoid. :)

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" 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

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