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Rockwood

Red algae ?

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Rockwood

Had to bring this one home from the gravel pit just in case. Typical finds are Devonian marine, but volcanics are in the mix too.

Any chance it's red algae ? 

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Mark Kmiecik

I'd have to say beige or grey. :heartylaugh:And on that note, I'll let someone who knows answer your question.

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Johannes

An ideal candidate for a polished cut section. ;)  Did you test the light spheres for carbonates? (edit: those algae are calcareous and should response to the test) Could be anything, for example there are lapilli tuffites looking similar....(edit: Lapilli should not response to carbonate tests, except some very very geochem. strange ones)

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supertramp
Rockwood

It is non reactive to 35% HCl and roughly in the glacial field of a mountain of ryolite (Kineo), so I think some type of volcanic is a reasonable assumption.

Thanks to all. :)

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Rockwood

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