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Small smooth ammonite


Dave J

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Hi. I'm still sifting through my ammonite draw. Again I found this ammonite on either Lyme Regis or Charmouth beach, Dorset. It seems smoother than my others? Could anyone offer me a possible species name? Is it still Jurrasic?

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I think it might be a species of Polymorphites  from the Stonebarrow Marl Member ("Belemnite Marls") , a variable and difficult genus some of which are smoother like that. Quite common.
(Arnioceras also has smooth centres but with a ridged keel and I don't think you usually get them in pyrite there - not sure about that though.)
Yes, it'll be Jurassic, Lower Lias.

 

 

Edited by TqB
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Tarquin      image.png.b7b2dcb2ffdfe5c07423473150a7ac94.png  image.png.4828a96949a85749ee3c434f73975378.png  image.png.6354171cc9e762c1cfd2bf647445c36f.png  image.png.06d7471ec1c14daf7e161f6f50d5d717.png

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13 minutes ago, TqB said:

I think it might be a species of Polymorphites  from the Stonebarrow Marl Member ("Belemnite Marls") , a variable and difficult genus some of which are smoother like that. Quite common.
(Arnioceras also has smooth centres but with a ridged keel and I don't think you usually get them in pyrite there - not sure about that though.)
Yes, it'll be Jurassic, Lower Lias.

 

 

Thank you very much. Probably naive of me but I'm surprised by how many different species can be found in one area.

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