Yes.
It would depend on how extensive the civilization was. If there was a civilization as large as ours, yeah, we'd find some evidence after 60 million years, but, in my opinion, not much. Fossilization is rare. If the artifacts are buried fast, then the chances improve.
I have kicked around similar ideas of a small colony buried by volcanic ash from the Eocene, like Pompeii.
It all comes down to how it gets preserved.