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Fossil or non-fossil


Henry T

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Hello again everyone. So my question here is whether this is a fossil, or some sedimentary layering non-fossil? I found this at low tide at "Agate Beach", Bolinas, Marin County. California.

 

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Non fossil.

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Tidgy's Dad

A water worn piece of conglomerate, I think. 

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DPS Ammonite

Even though there is only a slight chance this is a fossil, the light-colored elongated tubular/elongated crystal area surrounded by brownish areas are interesting. Could be bone, worn tubes, coral, bryozoa etc. A close-up microscopic photo will help. Most likely they are phenocrysts in volcanic rock. Take it over to friends at the nearby Northern California Geological Society in Orinda: http://www.ncgeolsoc.org/ Have a geologist with a hand lens look at it. Let us know what they call it. Also let us know if the rumor is true: 2 different geologists have 3 opinions.

 

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