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.
My daughter found this really cool fossil yesterday on Bolinas Lagoon. Any clues as to what it could be? We find lots of sand dollar fossils around here but this looks more like a bone from a large animal.
It's about two inches in length & an inch wide. Very heavy.