Joseph Kapler Posted March 21, 2020 Share Posted March 21, 2020 This is an ammonite out of an old teaching collection. Can some one help me with an identification? The tag (which after 40 years may not be the correct tag) indicates Prionocyelus, Niobrara Formation Albany County, Wyoming. The ammonite is 2.1 inches in diameter. Link to comment Share on other sites More sharing options...
Ludwigia Posted March 21, 2020 Share Posted March 21, 2020 The correct spelling is Prionocyclus. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Joseph Kapler Posted March 21, 2020 Author Share Posted March 21, 2020 I am sorry that I ‘fat-fingered’ the spelling. It does not appear to me that it is Prionocyclus, so my question is what might it be. Thank you for your correction. Link to comment Share on other sites More sharing options...
taj Posted March 21, 2020 Share Posted March 21, 2020 Reminds me of some end callovian /oxfordian stuff from les Vaches noires ....Preservation would hint at some russian origin though . All of this based on visual clues only Link to comment Share on other sites More sharing options...
FossilDAWG Posted March 21, 2020 Share Posted March 21, 2020 Maybe a Cadoceras? If so, that is Jurassic so the whole label would be wrong, maybe it originally belonged to a different specimen. I don't know of any Niobrara Formation ammonites that look like that. If it is from Wyoming there is a scaphitid ammonites genus, Rhaeboceras, that looks somewhat similar although the umbilicus is smaller than it is in your specimen. However that genus occurs in the Pierre Shale and equivalent formations which are younger than the Niobrara. Don 1 Link to comment Share on other sites More sharing options...
Joseph Kapler Posted March 21, 2020 Author Share Posted March 21, 2020 Thank you Don, My wife, also a science teacher, thought it possible that the label was switched sometime during the last 40 year. Cadoceras and especially Rhaeboceras are good leads. It gives me something to go on. Thanks. Link to comment Share on other sites More sharing options...
Ludwigia Posted March 22, 2020 Share Posted March 22, 2020 Cadoceras would be a good possibility. Maybe from Ashton Keynes? 1 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Joseph Kapler Posted March 22, 2020 Author Share Posted March 22, 2020 Cadoceras sublaeve (Sowerby) from Ashton Keynes looks to have the identical ribbing as the specimen in question. 1 Link to comment Share on other sites More sharing options...
Ludwigia Posted March 22, 2020 Share Posted March 22, 2020 16 hours ago, Joseph Kapler said: Cadoceras sublaeve (Sowerby) from Ashton Keynes looks to have the identical ribbing as the specimen in question. Yes, that's the one. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
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