Strange fossil - this fossil has it all.... white solid bone (lick test>?), hardened brown non-rock like material (told possible brain encasing?), all encased in sandstone, hardened sand, and brownish marrow like substance. When I first came across this (along with many other from Scotts Valley, CA - approx. 40-50 years ago found by my father in a ravine) Ive been attempting to uncover it (it was a large blank piece of sandstone). probably not the smartest thing to do but this one came easy (or shall I say easier) that the many others. I have several more pics if interested, but could only send these per page.