Fossil seed – Carpolithus sp.
Early Eocene Green River Fm.- Parachute Creek Mbr.
Douglas Pass, CO USA.
8mm fruit on 32mm slab.

Carpolithus is a form genus of a seed or fruit not known to be associated with a particular plant.

It’s a basic name for a nondescript fossil.  It’s derived from Greek with a basic meaning, “fruit stone,” in other words “a fruit turned to stone.”