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  • Composita subtilita


    DPS Ammonite


    Lamp shell

    Kingdom: Animalia
    Phylum: Brachiopoda
    Class: Rhynchonellata
    Order: Athyridida
    Family: Athyrididae
    Genus: Composita
    Species: Composita subtilita
    Author Citation (Hall 1852)

    Geological Time Scale

    Eon: Phanerozoic
    Era: Paleozoic
    Period: Carboniferous
    Sub Period: Pennsylvanian
    Epoch: Middle
    International Age: Moscovian


    Naco Formation


    Collector: Me
    Date Collected: 09/08/2020
    Acquired by: Field Collection


    Width: 15 mm
    Thickness: 10 mm


    Roberts Mesa fossil locality
    Gila County
    United States


    Composita subtilita is the most common brachiopod in the Pennsylvanian Naco Formation in central Arizona. This silicified one was found while etching out a giant horn coral. The red Beekite chalcedony dots give this one character. 

    Photo 1  Brachial valve.


    Photo 2  Pedical valve.


    Photo 3  Closure with sulcus.


    Photo 4  Shell with giant silicified horn coral.

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