My sister found this seashell fossil in Altamont, California, and asked
me to try and do some research on it. I know nothing about the subject
but agreed because she has not computer. This fossil is 7" wide
and 10" long. Any information you could supply would be great!
I'm sending pictures I took with my iphone.
Thanks in advance,
Its an Inoceramus. What species I have no idea. Mesozoic, likely
Cretaceous in age. Best, Chuck P.
And Chuck should know. Inoceramidae are pretty featureless shells,
but they look Cretaceous to me, probably Inoceramus. It doesn't
look Jurassic (eg Retroceramus), which tend to be mytiliform ie
somewhat to strongly elongate....Andrew G.