Jessica's stone appears to be Paleozoic based on the apparent
brachiopod shell molds. The apparently hollow circular thing in
the middle may be a tube bored through the sediment which fossilized
differently due to organic material, or it may be a tubular sponge,
or ??? ... Allen A
Echinoderm ossicle, I think. Not a crinoid columnal, but if
it's Paleozoic it might possibly that of a blastoid or cystoid;
I'm not familiar with the scultpure on the articulating faces of
the latter two. The other fossils in the rock aoppear to be brachiopods,
as Allen suggests. ... Andrew G.
- Jessica's stone appears to be Paleozoic based on the apparent
brachiopod shell molds.
Also, exposed rock in the area is generally Paleozoic (though random
chunks from almost any age might be present due to glaciation). The
circular structure is an echinoderm column, as Andrew suggested. ...
Dr. David C.