great-britton-fossils Posted Tuesday at 03:59 AM Share Posted Tuesday at 03:59 AM Hello! This is my first time posting, and found this in my collection the other day. Anyone have an idea? Thanks for the help! Britton Quote Link to post Share on other sites
ClearLake Posted Tuesday at 04:11 AM Share Posted Tuesday at 04:11 AM Welcome to the forum. It looks like you have a straight (orthoconic) nautiloid. Any idea where it came from or what age it is? 2 Quote Link to post Share on other sites
ThePhysicist Posted Tuesday at 04:28 AM Share Posted Tuesday at 04:28 AM Welcome to the forum from Texas! This is an Orthoceras, likely from Morocco based on the preservation. Quote Link to post Share on other sites
great-britton-fossils Posted Tuesday at 03:03 PM Author Share Posted Tuesday at 03:03 PM 10 hours ago, ThePhysicist said: Welcome to the forum from Texas! This is an Orthoceras, likely from Morocco based on the preservation. Yep, from Morrocco and that's all I knew. Thanks so much! Quote Link to post Share on other sites
great-britton-fossils Posted Tuesday at 03:04 PM Author Share Posted Tuesday at 03:04 PM 10 hours ago, ClearLake said: Welcome to the forum. It looks like you have a straight (orthoconic) nautiloid. Any idea where it came from or what age it is? From Morocco. Quote Link to post Share on other sites
Kane Posted Tuesday at 03:07 PM Share Posted Tuesday at 03:07 PM More likely Geisonoceras, as I believe Orthoceras is restricted to its type specimen in the Baltic region ( @Tidgy's Dad knows more about them than I do). 2 1 Quote Link to post Share on other sites
Thecosmilia Trichitoma Posted Tuesday at 03:17 PM Share Posted Tuesday at 03:17 PM It’s interesting to see a specimen that isn’t polished from that area. From what I know, it is most likely from the Atlas Mountains there. Quote Link to post Share on other sites
Tidgy's Dad Posted Tuesday at 04:06 PM Share Posted Tuesday at 04:06 PM Most of these come from the south of Morocco in the Anti Atlas region, many from Erfoud and the surrounding areas. They are chiefly Early to Middle Devonian in age , though there are some Late Silurian and Late Devonian ones that look like this. Kane is right in saying that the genus Orthoceras is now restricted to the type species O. regularis from the Middle Ordovician of the Balto-Scandinavian region. Many are from the family Geisonoceratidae, but not all are even orthocerids, orthoconic Pseudorthocerida and Actinocerida are also common. You need to be an expert and / or have a precise location to get to genus level in your ids. Your specimen has dips in the centre of the chamber between the septa that may help reduce the number of candidates. 3 3 Quote Link to post Share on other sites
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