araucaria1959 Posted February 17, 2013 Share Posted February 17, 2013 Hello, many years ago I got some middle jurassic ammonites from UK, but I have no label. Is it possible to tell from the pics, where they come from, and what they are? I show also the backsides of some specimens because it may help to see the surrounding sediment. The first four specimens are without oolites, the last two ones are in oolitic sediments. My suggestion for the first four ammonites is Leioceras opalinum from Bridport, but it's only a guess. Specimen 5 looks also like Leioceras, but specimen 6 is possibly different (Graphoceras ?). They also differ because of the oolites so they may be from another locality or another layer. Thanks, araucaria1959 Link to comment Share on other sites More sharing options...
DeloiVarden Posted February 17, 2013 Share Posted February 17, 2013 I am not an ammonite expert, but these look nice too me! Link to comment Share on other sites More sharing options...
Terry Dactyll Posted February 17, 2013 Share Posted February 17, 2013 I think your right with Burton Bradstock being the source for these...Leioceras is right I reckon for the first 5 but no 6 as you say is different... I have no ID materials for this stuff as its 'just' out of my collecting field... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
Ludwigia Posted February 17, 2013 Share Posted February 17, 2013 Here's my suggestion: Specimens 1,3,4,5: L. opalinum Specimen 2: L.comptum, maybe also L.(Cyclicoceras) sp. You'd need the exact horizon to be sure. Specimen 6: Is definitely a Graphoceras, but the species is not easy to ID. It's not concavum, the navel is too narrow. Perhaps G. pulchrum as first choice or G. cavatum. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
araucaria1959 Posted February 17, 2013 Author Share Posted February 17, 2013 Thank you very much! Great work! araucaria1959 Link to comment Share on other sites More sharing options...
araucaria1959 Posted February 17, 2013 Author Share Posted February 17, 2013 Here are two additional specimens. They have a label "inferior oolite, Bridport, Dorset". They remind me of Ludwigia, but seem to be different species (L. murchisonae for the first one, specimen 7?) araucaria1959 Link to comment Share on other sites More sharing options...
Ludwigia Posted February 17, 2013 Share Posted February 17, 2013 (edited) Those both look like microconches. Specimen 7: Graphoceras(Ludwigella) ?cornu Specimen 8: Graphoceras(Ludwigella) rudis Edited February 18, 2013 by Ludwigia Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
araucaria1959 Posted February 17, 2013 Author Share Posted February 17, 2013 Thank you very much! araucaria1959 Link to comment Share on other sites More sharing options...
Ludwigia Posted February 18, 2013 Share Posted February 18, 2013 You're welcome. I'm on home ground in these layers. One of these days I'd love to visit Bridport and Horn Park. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
DE&i Posted February 19, 2013 Share Posted February 19, 2013 (edited) Hello, many years ago I got some middle jurassic ammonites from UK, but I have no label. Is it possible to tell from the pics, where they come from, and what they are? I show also the backsides of some specimens because it may help to see the surrounding sediment. The first four specimens are without oolites, the last two ones are in oolitic sediments. My suggestion for the first four ammonites is Leioceras opalinum from Bridport, but it's only a guess. Specimen 5 looks also like Leioceras, but specimen 6 is possibly different (Graphoceras ?). They also differ because of the oolites so they may be from another locality or another layer. Thanks, araucaria1959 Could number 6 be Strigoceras truellei or Hyperlioceras discites Darren. Edited February 19, 2013 by D&E Regards.....D&E&i The only certainty with fossil hunting is the uncertainty. https://lnk.bio/Darren.Withers Link to comment Share on other sites More sharing options...
Ludwigia Posted February 21, 2013 Share Posted February 21, 2013 Hmmm...you may be right with Strigoceras, but I don't think it's a Hypolioceras. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Ludwigia Posted February 22, 2013 Share Posted February 22, 2013 Hmmm...you may be right with Strigoceras, but I don't think it's a Hypolioceras. A view of the keel would be helpful. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
araucaria1959 Posted February 23, 2013 Author Share Posted February 23, 2013 Both specimens have a keel, but it is not very strong. araucaria1959 Link to comment Share on other sites More sharing options...
Ludwigia Posted February 23, 2013 Share Posted February 23, 2013 I've had a closer look again, also at the last photo, and I still tend to Graphoceras. The inner whorls are too wide for Strigoceras and there's no typical furrow on the side. 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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