Does anyone know about the evolution of Ammonites?!? (1 Viewer)

[jacski007]

Hi if you are reading this (please do - especially if you know about ammonites!!)
Basically im struggling to get information about the evolution of ammonites - since everything im finding is contradictory (!!!) so it'd be great if someone could help me out since im stressing since i have an oral, ppt and fact sheet due on monday and atm im totally confused... anyway thanks

 

[surfingsmurf]

When i did a similar assignment the main fossils we could do were trilobites, ammonites and Graptolites.
I chose ammonites. The main evolutionary changes in the Ammonites were an overall coiling then uncoiling, as well as a development of stronger shells with more ornamentation.
I chose to do the uncoiling of the ammonites.