Brachiopod from Madison group Misson

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This topic contains 4 replies, has 2 voices, and was last updated by  David Powers 1 year, 1 month ago.

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  • #39446

    David Powers
    Participant

    I have a brachiopod taken from the Madison group, Mission Canyon member. I am working on species. I’m thinking it is rafinisquina ponderosa  or strophomena vetusta. I’m not sure. I can use some help.

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    #39448

    Asa Kaplan
    Participant

    David, nice fossil. If this is definitely from the Madison Limestone then it is Mississippian in age — far too young to host Rafinesquina or Strophomena. I do concur that it is a strophomenide brachiopod, most likely an orthotetidine.  This article is a good jumping-off point:

    https://imnh.iri.isu.edu/digitalatlas/geo/gsa/papers/gsac1p4.pdf

    #39449

    David Powers
    Participant

    Hi Asa Kaplan,

    Thanks for the link to the PDF. I saw that article before. I didn’t save the article for future use.  I wasn’t sure the age of the limestone. I found this article “Type Sections of the
    Madison Group (Mississippian)
    and its Subdivisions in Montana
    GEOLOGICAL SURVEY PROFESSIONAL PAPER 842”
    This article identifies the area to the mile where I found the brachiopod.  I will now use the linked article you’ve given to narrow the species. I will be looking at the  ones you named to see how they line up with what I have.

    Cheers

    David

    #39450

    Asa Kaplan
    Participant

    For a more extensive list of candidate brachiopods, see

    http://ftp.maps.canada.ca/pub/nrcan_rncan/publications/ess_sst/122/122462/bu_378.pdf

    Among orthotetidines, this publication lists only Schellwienella? cf . S. alternata Weller, 1914, with some good photos on plate 1.

     

    #39454

    David Powers
    Participant

    Hi Asa I’m looking at the publication.

    Thank you

    David

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