Help! Ammonite ID required.

Discussion in 'Cephalopod Fossils' started by Phil, Apr 1, 2005.

  1. Phil

    Phil Colossal Squid Supporter Registered

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    Hi all,

    Can anyone help to identify this ammonite for me please? A work colleague picked it up in a second hand shop for £6 and wondered if I knew which species it was. It certainly is not local.

    The specimen measures 1 1/2 inches in diameter and has a very thin profile with a slight raised keel. I will do some research, but I thought I'd let you chaps have a stab at it first.

    Phil

    (nice to be back!)
     

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  2. neuropteris

    neuropteris GPO Registered

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    Hi Phil - nice to see you are back in operation again.

    No idea on the ammonite but the matrix looks like an oolite so it could be from the Inferior oolite around the Burton Bradstock area of Dorset if its from the UK. The inferior oolite is highly fossiliferous with a diverse ammonite fauna and is Middle Jurassic if thats any help in pinning it down - if its not from the UK all that could be wrong though.

    All the best

    Andy
     
  3. Phil

    Phil Colossal Squid Supporter Registered

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    Thanks Andy. Unfortunately we don't know where it came from, but perhaps you are right. I'll pass it on.

    I am leaning towards an Early Jurassic Oxynoticeras ID, or something very similar to that. Anyone agree/disagree?
     
  4. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    There are a number of Hildoceratids with a compressed whorl section, falcoid ribs and a keel, it could be any one, or even a homeomorph. Really need locality or age info.

    Sorry Phil, this don't help much :sad:
     
  5. spartacus

    spartacus Haliphron Atlanticus Registered

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    from what I'm pulling up, it looks French & therefore early Jurassic, any sign of spines on the keel or smell of garlic ?
    will consult my guide & brb

    Keef
     
  6. Phil

    Phil Colossal Squid Supporter Registered

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    Thanks Kevin. Here's another picture though I don't think it'll be of much help. The flash reflecting off the varnish tends to mask some of the detail. I'll try another without the flash on in the daylight in the next day or two. (I'm sure you'd like your fossil back Neale!)

    No spines or other Gallic wierdness, Spartacus. I think any money put on early Jurassic date is onto a winner though.
     

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  7. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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  8. Phil

    Phil Colossal Squid Supporter Registered

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    Kevin,

    Thank you very much, I think you may have got it, the specimen resembles the image provided in your link to Dorsetensia to a remarkable extent, including the profile. I will pass the details onto Neale tomorrow.

    I've had a Google search on Dorsetensia which was interesting as not only had I had never even heard of it before, but I did not realise there were beds of these beasts in Somerset in SW England preserved in oolite. Also thanks to Andy too here for the oolite suggestion.

    Interesting details here, from a Somerset City Council Report from 1997;

    I knew I could rely on you chaps to come up trumps!
     
  9. spartacus

    spartacus Haliphron Atlanticus Registered

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    that Kevin sure has a huge brain !

    Keef
     
  10. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    And alotta books :wink:

    And Google :wink:

    There are a few more it could possibly be but I cant find anything on the web. Try Darellella and Reynesella, they look comparable. Amaltheus has a similar shape and ribs, but the keel is serrated.:smile:
     
  11. spartacus

    spartacus Haliphron Atlanticus Registered

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    Kevin, I've got a lot of books too :read: but could only come up with ammonite
    have a gold star on me !

    Keef
     
  12. Phil

    Phil Colossal Squid Supporter Registered

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    Thanks again Kevin.

    I'm afraid I have been unable to find any images of Darellella and Reynesella to compare. They are not listed in any of my books, on my copy of Paleobase or register any hits on the net. The keel, as you say, is smooth, so it cannot be Amaltheus. Still, the rock seems to be oolite as Andy has pointed out, and it looks so close to the link you kindly provided to Dorsetensia that I'm sure that be the beast in question, especially considering that the type of rock is very similar or identical to the Somerset beds.

    Thanks again!
     
  13. neuropteris

    neuropteris GPO Registered

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    Definately not Amaltheus so my moneys on Dorsetensia aswell :smile:

    The ammonite fauna in the inferior oolite really is spectacular - I went to a dig at the Burton Bradstock caravan park a few years ago and it was amazing - didn't get much as most of what was there had already been spoken for but there were ammonites (mainly Parkinsonia) as big and bigger than dinner plates lying around together with huge Stephanoceras, Breydia, Leioceras and nautilus - dead ceph paradise! Did get one nice Parkinisonia (pic attached). The land owners were digging out hard standing for new caravans so this stuff was just being dumped as waste but the local collectors get wind of new exposures and get in there first. Still - it was nice to see.

    Andy
     

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  14. palentologistDH

    palentologistDH Larval Mass Registered

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    Hello
    It is a Austiniceras ammonite, 95-70million years Cretaceous.
    At £6 it was a bargain I thing a good price would be £15.
    Daniel
     
  15. Architeuthoceras

    Architeuthoceras Architeuthis Staff Member Moderator

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    :welcome: to TONMO Daniel

    Looks like your on the right track. Austinoceras :smile:
     

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