Triassic/Norian/Alaunian I, Ammonite Fauna

Do you the precise zone that they were collected from? I've been doing a bit of research into the Lias, and supposidly, any ammonites collected before the Psiloceras planorbis zone aren't technically ammonites. Have you found any Jurassic ammonites in the same area?

Regards,

Joe

What? No smilies? I wanted to post "green with envy"

Hello Joe,

the zone ammonite is Cyrtopleurites bicrenatus HAUER.

You are right with the term "ammonites". Exactly they are meso-ammonites with ammonitic suture. That fit better than ceratitic ammonites.

F.e. Rhacophyllites is from the ancestor group of the jurassic Psiloceras sp.

The triassic Hallstatt limestone ends with the uppermost triassic. The transition Triassic/Jurassic is normally not preserved there.

If you are interested in more, you can read a few reports about the "Hallstatt limestone" in my blog.

There are also jurassic locations here in Austria. But mostly in another tectonic nappe.

The new Jurassic GSSP (Global Boundary Stratotype Section and Point ) is the "Kuhjoch Section" in the Karwendel mountains. The earliest Jurassic ammonite there is Psiloceras spelae tirolicum.

Roger: I would like to post "green with envy" too, when I see your ammonites. And here is the asked :-)

Regards

Andreas