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  • Mussle Shell Steinkern


    Images:

    I_gotta_rock
    • This is a particularly fragile type of shell, made of many fine layers, and is prone to disintegrate as these did. This rare steinkern was found on a block of matrix submerged in the Chesapeake Bay.  Dimensions are for the best-exposed steinkern on the block. The entire block is 14 cm wide x 10 cm high x 5 cm deep.

    Taxonomy

    Mussel

    Kingdom: Animalia
    Phylum: Mollusca
    Class: Bivalva
    Order: Ostreidae
    Family: Pinnidae
    Genus: Atrina
    Species: A. harrisii
    Author Citation Dall, 1898

    Geological Time Scale

    Eon: Phanerozoic
    Era: Cenozoic
    Period: Neogene
    Epoch: Miocene

    Stratigraphy

    Choptank Formation

    Provenance

    Collector: me
    Date Collected: 07/03/2017
    Acquired by: Field Collection

    Dimensions

    Width: 5cm
    Height: 9cm

    Location

    St Leonard
    Calvert County
    Maryland
    United States

    Comments

    This is a particularly fragile type of shell, made of many fine layers, and is prone to disintegrate as these did. This rare steinkern was found on a block of matrix submerged in the Chesapeake Bay.  Dimensions are for the best-exposed steinkern on the block. The entire block is 14 cm wide x 10 cm high x 5 cm deep.



    User Feedback


    doushantuo

    Posted · Report

    I'm here to learn.

    Do you mean the chalky deposits sensu ("in the sense of") Korringa?

    Isn't it ATRINA,btw?(deliberately neglecting the more obvious spelling error here:ninja:)

    batht5y57x250.jpg

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    I_gotta_rock

    Posted · Report

    I'm not sure I follow you, but if I understand your question @doushantuo, the impression you see here is sand that filled the empty pair of shells and just barely hardened enough to hold the shape when the shell disintegrated. It is keeping its shape now thanks to loads of Paleobond applied when it was still wet enough not to crumble. I have actual shell material here, collected maybe 10 meters away. It is about the same dimensions and only about 3 mm thick. I haven't gotten as far as photographing that one yet. 

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    I_gotta_rock

    Posted · Report

    Typo was change to reverse the r and t in "Atrina."  Thank you. It is late for me, what other "obvious spelling error?"

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    shows a nice cluster of them in life position. Had to blow up the pic to appreciate the group!

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