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Is this bone? Coral? Petrified burrows?


Jodom512

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Can anyone help me identify these. They are coming out of several cliffsides on my property. At first glance they look like bones but they crumble and break easily and appear to have a smooth inside. Surround by seashells and i have found these shark teeth in the mix. This is in south austin close to onion creek, not too far from pilots knob volcano. 

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Looks like a Rudist Reef.

http://www.google.com/search?q=rudist+reef+cretaceous&btnG=Search&hl=en&gbv=1&tbm=isch

Rudists were marine bivalves there had rather odd shapes. That third photo down seems to show a "lid" on one of the rudists.

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They looks like infilled burrows, to me.

" 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

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