• Welcome to TONMO, the premier cephalopod interest community, and birthplace of #WorldOctopusDay and #CephalopodAwarenessDays. Founded in 2000, we are a large community of experts, hobbyists and enthusiasts, some of whom come together when we host our biennial conference. To join in on the fun, sign up. You can also become a Supporter for just $50/year to remove all ads and enjoy other perks. Follow us on Twitter for more cephy goodness.

A few interesting fossil cephs.

Phil

TONMO Supporter
Supporter
Joined
Nov 19, 2002
Messages
3,033
A few more fossil cephalopods for you that I have acquired recently:

1. Not very spectacular but here we have two body chambers of the Upper Cretaceous ammonite Baculites. It has a lovely iridescent hue which unfortunately does not really come across well in the photo. Baculites was a straight shelled ammonite which sometimes grew up to 2m in length. Neale has written that this form of ammonite may have lived with their head facing downwards with the body hanging vertically above, perhaps analogous to a modern cranchid squid. It seems that unlike the superficially similar earlier orthoconic nautiloids, Baculites had no counterweight at the apex of its shell so could not have horizontally orientated. These are some of the very latest ammonites.

2. This is a Triassic period ceratite from Timor. The ceratites were a group of cephalopods that rose to dominance in the Triassic following the disappearance of the goniatites at the end of the Permian and were themselves replaced in the Jurassic by the ammonites. The ceratites had more complex sutures than the goniatites but were generally not as complex as the ammonites. The distinctive saddle and lobe arrangement can be easily seen here in this polished specimen. I’m not sure of the species, any help would be appreciated.

3.Belemnite sp. This specimen is about 190 million years old (Early Jurassic) and was collected from the Alum Shales at Port Mulgrave in North Yorkshire. (UK). It has been glued back together in four places and has been slightly crushed at one end. Nice specimen; again, I’m not sure of the species though I suspect it may be Acrocoelites. Any ideas anyone?
 
Joined
Nov 7, 2009
Messages
21
wow! cool, i wear a necklace with a small Ammonites, i tried to identify the species and it looks similar to the Silestes genus.
 

Latest Posts

Forum statistics

Threads
20,946
Messages
206,975
Members
8,489
Latest member
grantbey

Monty Awards

TONMOCON IV (2011): Terri
TONMOCON V (2013): Jean
TONMOCON VI (2015): Taollan
TONMOCON VII (2018): ekocak


Top