Architeuthoceras
Aug 31st, 2005, 08:55pm
Simulation of one ammonite shell morphotype by another. The fossils below are Schloenbachia varians from the lower Cenomanian (Late Cretaceous) from This Site (http://www.regional-geology.nl/Fotos/Chfotos/schloenbachia.htm).
http://www.regional-geology.nl/Fotos/Chfotos/schloenbachia.JPG
And another with a ventral view from this site (http://f.diebold.free.fr/ammonites/ROU-003.html)
http://f.diebold.free.fr/ammonites/ROU-003.jpg
The attached photos are Forresteria alluaudi from the Coniacian (also Late Cretaceous but a few million years younger), the robust, spinose morphotypes are very similar, and at least for me, they would be very hard to differentiate by shell shape alone.
http://www.regional-geology.nl/Fotos/Chfotos/schloenbachia.JPG
And another with a ventral view from this site (http://f.diebold.free.fr/ammonites/ROU-003.html)
http://f.diebold.free.fr/ammonites/ROU-003.jpg
The attached photos are Forresteria alluaudi from the Coniacian (also Late Cretaceous but a few million years younger), the robust, spinose morphotypes are very similar, and at least for me, they would be very hard to differentiate by shell shape alone.