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Showing results for tags 'macroconch'.
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Parent_1997-Geobios.pdf Ontogeny and Sexual dimorphism of Eurycephalites gottschei(Tornquist)(Ammonoidea) of the Andean Lower Callovian(Argentine-Chile) Geobios 30-3,30-6-1997 recommended? You bet!! Avoid if allergic to quantitative analytic data treatment
Dear all, first post to this wonderful forum. I have recently been with friends in Lyme Regis and Charmouth and it was very productive. One friend found part of a fossilised fish in Lyme Regis, one a Crinoidea with filaments and all of us loads of ammonites. Can you help me identifying this one please and answer a few questions? I believe it is Echioceras raricostatum and here is my thinking: a) locality: Charmouth beach, left from car park b ) one keel on venter, visible under pyritised venter and just in one pyrite free spot c ) sutures ammonoid ( but I guess that is true for crucilobiceras densidodulum and other eoderoceras sp. too from that location) d) quite rectangular whorl shape and well visible ribs up into inner whorls - again, I guess that latter is true for crucilobiceras densidodulum and other eoderoceras sp. too from that location e ) ribs fade out at venter corner but seem to dive down to keel at the same time - if I see that correctly, then this seems to be typical for echioceras f) where the outer whorl ribs are not damaged, they do not show spikes or tubercles, which should exclude eoderoceras sp. g) whorls very evolute (true again also for crucilobiceras densidodulum and other eoderoceras sp. from that location) Questions: 1) is my argumentation and identification attempt sound? 2) have I missed something that could have been helpful in identification? 3) am I right in assuming that I cannot remove the pyritized material, overlaying the pyrite inner whorls? 4) lastly some pure speculative question: there is a potential macroconch aligning the body chamber exit with the body chamber from the main fossil. Could those two have been buried whilst mating? I hope this post is not too long and someone can help me?
AMMONITE gender THAT IS - Could this nodule of Eleganticeras elegans ammonites be a male (microconch) and female (macroconch)? The larger ammonite (that I think is a female) is 3" and the smaller "male" ammonite is 1.5". I thought this was a real neat nodule when I got it and it would mean a lot more to me if my hunch is right. It’s Jurassic from England of course and if you know your British Ammonites, I would appreciate your feedback. mikey