78mm Sand dollar has a 2mm hole on the edge.
With trough shell, Dosinia, Resania, mussel, angled wedge, Pipi, Cockles, Zenatia, Triangle, Tuatua edge chipped.
Photo2 Pipi has barnacles and small pits on the inside. The outside has many small pits also, no barnacles.
The bigger cockle has furrows on both sides. The smaller cockle also has furrows, two right through the shell.
Link borer after death
http://woostergeologists.scotblogs.wooster.edu/2011/09/25/wooster%E2%80%99s-fossil-of-the-week-a-venerid-bivalve-upper-cretaceous-of-jordan/