David Clark

  • 3 days, 20 hours ago
    David Clark posted a new activity comment

    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.

  • 4 days, 21 hours ago
    David Clark posted a new activity comment

    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.

  • 4 days, 23 hours ago
    David Clark posted a new activity comment

    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!

  • 1 week, 4 days ago
    Samantha Ocon and David Clark are now friends
  • 2 weeks ago
    David Clark posted a new activity comment

    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 portal as well. Talk to you soon, Jen

  • 2 weeks, 3 days ago
  • 2 weeks, 3 days ago
    David Clark posted a new activity comment

    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 of with blastoid color patterns. I think Alex Fabian may have another Mississippian site in Indiana that was published, but I think they are also Pentremites. That might even be the Harold Beaver study.

    I’ll try to clean up the pictures and entries soon!

    • 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!

  • 7 months ago
    David Clark joined the group Bookworms
  • 8 months, 2 weeks ago

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

  • 8 months, 2 weeks ago
    Crystal Edmonds and David Clark are now friends
  • 8 months, 2 weeks ago
    Jennifer Bauer and David Clark are now friends
  • 2 years, 9 months ago
    David Clark posted a new activity comment

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

  • 2 years, 10 months ago
    David Clark uploaded a new image to Fossil #014620
  • 2 years, 10 months ago
    David Clark posted a new specimen.

    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. Here is what Macrostrat has on the formation: https://macrostrat.org/sift/#/strat_name_concept/1808

      These are particularly cool because of the coloration patterns!!

      I’m sure you have read Harold Beaver’s study on the coloration patterns in Pentremites? It would be interesting to replicate the O’Malley & Ausich’s work on biomarkers in Mississippian crinoids with Pentremites. They suggested there were evolutionary implications but I wasn’t really following. But we could surely test it with Pentremites since I have a working tree, I would just have to add some more species!

      • 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 of with blastoid color patterns. I think Alex Fabian may have another Mississippian site in Indiana that was published, but I think they are also Pentremites. That might even be the Harold Beaver study.

        I’ll try to clean up the pictures and entries soon!

        • 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!

  • 2 years, 10 months ago
    David Clark commented on their own Fossil #014620

    Blastoid with preserved color patterns and brachioles.

  • 2 years, 10 months ago
    David Clark updated their own Fossil #014620
  • 2 years, 10 months ago
    David Clark uploaded a new image to Fossil #014620
  • 2 years, 10 months ago
    David Clark updated their own Fossil #014620
  • 2 years, 10 months ago
    David Clark updated their own Fossil #014620
  • 2 years, 10 months ago
    David Clark updated their own Fossil #014620

    Classification

    From

    common

    Blastoid

    To

    common

    From

    kingdom

    To

    kingdom

    Animalia

    From

    phylum

    To

    phylum

    Echinodermata

    From

    order

    To

    order

    Spiraculata

    From

    family

    To

    family

    Pentremitidae

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