Are these also mollusks ?

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  • #136921
    paul mars
    Participant

    Likewise given to me when i was a kid.

     

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    #136926
    Matthew Downing
    Participant

    Hi Paul,

     

    Those are very nice mold/cast fossils of brachiopods, which superficially look like mollusks but belong to a different phylum. They have different symmetry and internal organs. Nice specimens!

     

    Matt

    #136998
    paul mars
    Participant

    How do fossils like this form?

    #144380
    Matthew Downing
    Participant

    The shells get buried in the mud and the shell often gets remineralized or altered. The mud hardens and often splits along bedding planes which have the fossilized shells in them.  I’ve attached a plate of drawings of some common brachipods.

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