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Finer Resolution Plate Tectonics Movie

Home Forums Ichthyology Finer Resolution Plate Tectonics Movie

This topic contains 0 replies, has 1 voice, and was last updated by  Matt 2 years, 7 months ago.

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  • #303589

    BillT
    Participant

    Here is a link to a new map (movie actually) of plate tectonics at 1 million year intervals.

    I have an older one I got hold of that has 20 million year intervals.

     

    http://news.sciencemag.org/earth/2015/03/earths-tectonic-plates-skitter-about

     

    I find these kind of things interesting. For example, I can see what things looked like when the Danionins were originating, maybe 30-40 MY ago in South Asia (a geologically interesting area).

    A related issue of interest is how the Cichlids ended up on S. America and Africa if they had not yet evolved until after the two continents split.

    #354415

    Matt
    Keymaster

    Nice link Bill. Isn’t the common ancestor of cichlids a marine taxon? Perhaps that might help explain their evolution?

    #354416

    BillT
    Participant

    Thanks Matt.

    I think the ancestral cichlid was supposed to have been in Africa but some how migrated to S. America after they split.

    One theory I recell is that the freshwater river outflow (Amazon and maybe Congo) made the then narrow S. Atlantic more fresh water so it was tolerable to the freshwater cichlids.

    #354481

    Matt
    Keymaster

    So they may have crossed via a historically more brackish Atlantic? Interesting that quite a few extant cichlids are known to occur in similar conditions.

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