1) Triassic ammonite
Found on
https://www.crosswordclues.com/clue/ceratites
Ceratites (`Horn Stone`) is an extinct genus of ammonite cephalopod. These nektonic carnivores lived in marine habitats in what is now Europe, Asia, and North America, during the Triassic, from Anisian to Ladinian age. This ammonite has a ceratitic suture pattern on its shell (smooth lobes and frilly saddles). Evolution of the frilly saddles is .....
Found on
http://en.wikipedia.org/wiki/Ceratites
(from the article `Triassic Period`) Ammonoids were common in the Permian but suffered drastic reduction at the end of that period. Only a few genera belonging to the prolecanitid group ...
Found on
http://www.britannica.com/eb/a-z/c/46
No exact match found.
