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"Ammonites are an extinct group of marine invertebrate animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs are more closely related to living coleoids (i.e. octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out during the Cretaceous–Paleogene extinction event.Ammonites are excellent index fossils, and it is often possible to link the rock layer in which a particular species or genus is found to specific geological time periods. Their fossil shells usually take the form of planispirals, although there were some helically spiraled and nonspiraled forms (known as heteromorphs)." Ref:http://en.wikipedia.org/wiki/Ammonoidea
I collected these ammonite fossils from Trichi, Tamil Nadu. I have no idea which genus this one belong to.
Spotted on Apr 11, 2011
Submitted on Nov 12, 2013
2 Comments
Thanks Lauren. Yeah it does look like two pretty old aliens quarreling over something. Maybe they are trying to figure out who is older :)
Very nice! So very old. (They look like two old alien guys yelling at each other :))