macrocephale Tue Oct 23, 2012 2:29 pm
The top one is two large partial ammonites (Choffaticeras segne), stuck together with a bit of matrix, with another small fragment, I presume of the same species, on one side as well. (The small fragment is bottom left in the picture, one of the large ones is visible and one on the other side). I found it in Morocco, at Asfla (Turonian- mid-Late Cretaceous).
The sutures are visible on the top large ammonite, but a fair bit of the outer shell has been lost (presumably dissolved over time), so only the bottom, duller layers remain.