I was on a beach on the York river in Virginia where there is a high sand cliff. It does not appear to be far along in the process to become sandstone.
I did notice though that there were on the beach some rocks which were aggregates where there were shells embedded in what looked like some sort of sandstone concretion.
In addition, I found a fossil which is basically the inside casting of a shell of some sort. Due to texture, it is not a Chesapecten. You can see the remainder of the originally shell as white material on the casting. I will post some pictures a little later.
What I am curious if these probably formed in the sand material that the cliffs were made from or if there are layers of actual sandstone maybe a little deeper in the river?