Hi, i found this gasteropod in a piece of earth that had the same color than the matrix of an Exogyra couloni (also called Aetostreon) and sticked with that matrix. It was in the fallen rocks of the mount Granier on the boarder of the road, so the period is uncertain, but i think it is hauterivian (-123 _ - 117 MY). I also found a toxaster sp.
I tried to find it out but without success. It also might be something very more recent.