1) Triassic ammonite
Found on
https://www.crosswordclues.com/clue/biltnerites
Biltnerites is an ammonite (s.l.) genus from the lower Triassic included in the ceratitacean family Tirolitidae of the order Ceratitida, characterized by a flat, evolute shell with moderately compressed, rounded whorls. The spinose stage characteristic of the Tirolitidae is absent, but the outer whorl does have indistinct ribs that cross the vente...
Found on
http://en.wikipedia.org/wiki/Biltnerites
No exact match found.
