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James Preslicka

Profile picture of James Preslicka

James Preslicka

@james-preslicka
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  • Profile picture of James Preslicka

    James Preslicka posted a new activity comment 2 years, 11 months ago

    2 years, 11 months ago
    2 years, 11 months ago

    Definitely looks like a Mazon Creek concretion. Middle Pennsylvanian – Des Moinesian Stage if I recall correctly.

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    James Preslicka posted a new activity comment 2 years, 11 months ago

    2 years, 11 months ago
    2 years, 11 months ago

    It’s a colonial coral, likely a Hexagonaria from the Devonian, although some Mississippian colonials look similar. It depends on what bedrock crops out in your area.

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    James Preslicka posted an update in the group Group logo of What is it?What is it? 2 years, 11 months ago

    2 years, 11 months ago
    2 years, 11 months ago

    Looking for some help in identifying this fern to genus level if possible, so it can be posted to the emuseum.  It is from the Mazon Creek fossil beds, near Morris, Illinois, USA.  It is from the Francis Creek Shale, which if I recall correctly is Middle Pennsylvanian – Des Moinesian Stage.  Any help would be much appreciated!



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      Jayson Kowinsky replied 2 years, 11 months ago

      It looks like a Pecopteris fossil. There are a few species. P subcrenulata, P mazoniana, P aborescense. There’s also Lobatopteris lumuriana that look like Pecopteris.

      I’m not sure how many of these are actually still valid. I’m leaning toward Pecopteris mazoniana for your specimen. I’d google Pecopteris fossils from mazon creek to find a…[Read more]

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    James Preslicka posted a new specimen. 2 years, 11 months ago

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    James Preslicka has contributed specimen mFeM 57008 to myFOSSIL!

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    James Preslicka joined the group Group logo of Imaging and Digitization for Avocational Paleontologists WorkshopImaging and Digitization for Avocational Paleontologists Workshop 2 years, 11 months ago

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    James Preslicka replied to the topic Found in Farmyard-Need help identifying please in the forum What Is It? 3 years, 2 months ago

    3 years, 2 months ago
    3 years, 2 months ago

    The bedrock in your area should be Cretaceous, but that coral bearing  rock sure looks Paleozoic to me.  It may perhaps be a glacial erratic – a piece of rock scraped up by an ice sheet during their advance, which is then left behind when the ice melts and retreats.

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    James Preslicka replied to the topic What kind of productida brachiopod is this? in the forum What Is It? 3 years, 2 months ago

    3 years, 2 months ago
    3 years, 2 months ago

    Thanks for the information. The roughly equivalent Formation here in my area would be the Pella Fm, which is Chesterian.  The Pella has lots of great stuff in it, but nothing that reminds me of those fabulous productids of yours, that’s for sure.

    There must have been shell banks of those things in your area for you to find so many slabs full of…[Read more]

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    James Preslicka replied to the topic What kind of productida brachiopod is this? in the forum What Is It? 3 years, 2 months ago

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    Echinoconchus are quite large and occur is some abundance in the Keokuk Formation in my neck of the woods (Midwest USA). I believe the time frame on that Fm is late Osagean, but I may be off a Stage.  Still, that should be similar in age to your stuff.  Index Fossils of N America states that spines are present on both valves of Echinoconchus, b…[Read more]

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    James Preslicka replied to the topic Found in Farmyard-Need help identifying please in the forum What Is It? 3 years, 2 months ago

    3 years, 2 months ago
    3 years, 2 months ago

    What part of South Dakota was this found in? It does look like a coral, probably a Paleozoic one to my eye.  Was this near the Black Hills area?

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    James Preslicka replied to the topic What kind of productida brachiopod is this? in the forum What Is It? 3 years, 2 months ago

    3 years, 2 months ago
    3 years, 2 months ago

    Any chance those might be Echinoconchus sp?

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    James Preslicka replied to the topic Fossil Specialties + Contacts in the forum What Is It? 3 years, 2 months ago

    3 years, 2 months ago
    3 years, 2 months ago

    A great list!  I’d be happy to try and help with cephalopods, and would have a general knowledge of Iowa Paleozoic fossils, especially Ordovician and Devonian.

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Development of myFOSSIL is based upon work largely supported by the National Science Foundation under Grant No. DRL-1322725. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.

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