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Mnemosyne

Petrified brain coral?

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Mnemosyne

I found this in my Seattle area yard, near the dead stump of a small maple. After washing and bleaching the septums appear filled with sand and shell bits. There is also something growing throughout it like a veinous system—likely plant? It is heavy. There are striated and mineralized layers. There is a ventricle feature and a faceted stem—it’s disturbingly brain-like. 
I feel honored to have finally guessed my way through your captcha (respect!)~~hoping someone can identify this oddity. Best guesses so far are coral or fungus, but I’ve not found any examples sporting this stem canal...

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Tidgy's Dad

Looks like a fossil sponge to me. 

Interesting find. :)

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Mark Kmiecik

Sponge was my first thought as well.

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fifbrindacier

It's a sponge, i agree.

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