1) Middle Jurassic extinction
Found on
https://www.crosswordclues.com/clue/zetoceras
Zetoceras is an extinct ammonoid cephalopod genus from the suborder Phylloceratina that lived during the Early and Middle Jurassic in what is now Europe, and is included in the (family) Phylloceratidae. Zetoceras has a compressed involute shell with a very small umbilicus. The suture is phylloid, as for the suborder,with tall primary sutural eleme...
Found on
http://en.wikipedia.org/wiki/Zetoceras
No exact match found.
