I'd have to look at it in person to be certain but it appears to me to be the side of the cast/void of a segment of petrified bone or wood that was embedded in that chunk of rock.
On Thu, Feb 1, 2018 at 8:31 AM, 'Clifford D. Morford' cdmorford@pacific.net [geology2] <geology2@yahoogroups.com> wrote:
Kim Noyes kimnoyes@gmail.com [geology2] wrote:
> That tells me nothing about the region from whence that came.
It's from the SW boundary of a discontinuous outcrop of the Coast Range
thrust, a late Mesozoic subduction zone, located 40 miles east of the
present coastline in Northern California. That's the whence and when of
it. Does that help answer the what?
Regards,
cliffordm
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Posted by: Kim Noyes <kimnoyes@gmail.com>
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