• David Clark posted a new activity comment 6 months ago

    6 months ago
    6 months ago

    What an interesting specimen! Jimbacrinus is a Permian crinoid only found in Australia. I think this may be a columnal or stem that was infected and bulged. This specimen has no obvious small tegmen plates (top of the calyx) or anal tube. It’s also curious if it only has 4 holes on the sides. If they were arms, it’s usually in multiples of 5. The…[Read more]

  • David Clark posted a new activity comment 6 months, 3 weeks ago

    6 months, 3 weeks ago
    6 months, 3 weeks ago

    I don’t think this is an Acanthocrinus. That’s a Devonian genus found in the Hunsruck slate and New York exposures. This looks like a free swimming crinoid, Saccocoma, which is often found in the Solnhofen limestone. The pictures look like the positive and negative pieces. Very nice specimen!

  • 1 year, 3 months ago
  • David Clark posted a new activity comment 1 year, 3 months ago

    1 year, 3 months ago
    1 year, 3 months ago

    I’m sorry. I thought you were questioning the genus/species. We have quite a few Dolotacrinus species in Alpena and Arkona and I missed your “family” comment.

    I think you’re correct about Dolatocrinidae. I’ll have to look at Davey’s paper to confirm.

  • David Clark posted a new activity comment 1 year, 3 months ago

    1 year, 3 months ago
    1 year, 3 months ago

    This is a Clarkeocrinus troosti, named for John Clarke, the first director of the New York State Museum. It’s a common crinoid from the Devonian of New York. Winifred Goldring’s memoir is a free download and great resource for New York crinoids. The NYSM website has the free pdf.

    • Yeah! I agree with your species identification but was working to fill in the family assignment as you have it blank in the classification scheme.

      • I’m sorry. I thought you were questioning the genus/species. We have quite a few Dolotacrinus species in Alpena and Arkona and I missed your “family” comment.

        I think you’re correct about Dolatocrinidae. I’ll have to look at Davey’s paper to confirm.

  • David Clark posted a new activity comment 1 year, 3 months ago

    1 year, 3 months ago
    1 year, 3 months ago

    This is actually the same specimen. As found in the field and after prep.

    • Wow! I think the brightness of the one really messed with me. That’s even cooler! If you get a chance to upload one with a scale that would be great!

  • Sam Ocon and Profile picture of David ClarkDavid Clark are now friends 1 year, 3 months ago

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  • David Clark posted a new activity comment 1 year, 3 months ago

    1 year, 3 months ago
    1 year, 3 months ago

    Looks like I did have a typo! The formation has changed from Osgood to Massie, so I’ll change that too. I’m not aware of any revisions and I think it fits into the calymene family. I know calymene in general is in need of a massive revision.

    • Yes, from what I understand Calymene is a huge garbage can of trilobites. It sounds like a big undertaking! I’ll stick with the blastoids, for now =D
      Thank you for getting this updated! If you get a chance to take another photo at some point, adding in a scale would immediate push this to ‘research grade’ so it can be searchable on iDigBio’s data…[Read more]

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  • David Clark posted a new activity comment 1 year, 3 months ago

    1 year, 3 months ago
    1 year, 3 months ago

    Hello Jenn – These are two specimens. I think I have 4-5 total. I should probably create new entries with better pictures. I entered these a few years ago and the picture quality isn’t the best.

    I’ve heard of Harold Beaver’s study, but I don’t think I have a copy. I have seen O’Malley & Ausich crinoid biomarkers. This is the only locality I know…[Read more]

    • That’s excellent you have so many! I think most of his specimens are still hidden away at Baylor rather than in their proper homes. I send you a direct message with a link to my Dropbox with some of his papers!

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  • David Clark commented on Jennifer Bauer‘s Fossil #026232 1 year, 11 months ago

    1 year, 11 months ago
    1 year, 11 months ago

    Partridge point is the locality. The formation is Thunder Bay Limestone. I love that site.

  • Crystal Edmonds and Profile picture of David ClarkDavid Clark are now friends 1 year, 11 months ago

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  • David Clark posted a new activity comment 4 years, 1 month ago

    4 years, 1 month ago
    4 years, 1 month ago

    Exactly. I have quite a few specimens from that locality. Mark Paladas sells them at MAPS every year.

  • David Clark uploaded a new image to Fossil #014620 4 years, 1 month ago

    4 years, 1 month ago
    4 years, 1 month ago
  • David Clark posted a new specimen. 4 years, 1 month ago

    4 years, 1 month ago
    4 years, 1 month ago

    David Clark has contributed specimen mFeM 50719 to myFOSSIL!

    • Hi, @david-clark – these are two separate specimens, is that correct? If you are interested, we can separate them into two occurrences – this will allow them to be migrated to iDigBio for others to find during their searches. You could also update the geochron to include Mississippian, I think the age is Visean but you’ll have to double check.…[Read more]

      • Hello Jenn – These are two specimens. I think I have 4-5 total. I should probably create new entries with better pictures. I entered these a few years ago and the picture quality isn’t the best.

        I’ve heard of Harold Beaver’s study, but I don’t think I have a copy. I have seen O’Malley & Ausich crinoid biomarkers. This is the only locality I know…[Read more]

        • That’s excellent you have so many! I think most of his specimens are still hidden away at Baylor rather than in their proper homes. I send you a direct message with a link to my Dropbox with some of his papers!

  • David Clark commented on their own Fossil #014620 4 years, 1 month ago

    4 years, 1 month ago
    4 years, 1 month ago

    Blastoid with preserved color patterns and brachioles.

  • David Clark updated their own Fossil #014620 4 years, 1 month ago

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  • David Clark uploaded a new image to Fossil #014620 4 years, 1 month ago

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