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  • Baybottom chert

    Florida
    When reefs get "fossilized", agatized , parts of it become Baybottom chert which shows the fossils within the stone, similar to coral. Coming from the water and being under water for a long time this material is almost always has a dark patina, often black and brown.
    Geologic/chemical process of replacement of the organisms' structures with cryptocrystalline quartz: chalcedony/Agate, even chert. In the case of coral, neat specimens of coral polyps. In baybottom, all kinds of organisms, mainly shell but sometimes there are also a few coral polyps in with the mix of other animals. Both materials will patinate the same to white in sand/dry and in water will take on colors of the river patina. But that frosting patina was almost unique!



    Baybottom Bolen
    photos and information courtesy of tomclark
    Searching the fields of Northwest Indiana and Southwestern Michigan

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    Professor Shellman

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