Any ideas on this one?
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  1. #1
    us
    Apr 2009
    North, Texas
    White's XLT & Quick Draw II
    491
    8 times

    Any ideas on this one?

    All 4 pics are of the same rock. There are 2 distinct patterns on here and I've never encountered this before. These pics are from my phone, I'll get better ones later if needed for ID assistance.

    I found this in the creek bed in Collin County, TX.

    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #2
    us
    Feb 2009
    Fort Worth, Texas
    49

    Re: Any ideas on this one?

    Looks like the septa (inside of the ammonite wall).

  3. #3
    us
    Feb 2009
    Northcentral Florida
    2,299
    1005 times

    Re: Any ideas on this one?

    Quote Originally Posted by Mosasaurfiend
    Looks like the septa (inside of the ammonite wall).
    That's exactly what these represent. The fluted surfaces are the evidence (an internal cast) of the walls (septa) of a large ammonoid shell. These walls separate chambers (camerae) in the shell. Each wall was laid down sequentially at the rear of the living chamber as the animal grew in size.
    Sometimes I go about pitying myself, and all the time
    I am being carried on great winds across the sky.

    ------Chippewa saying, translated by Robert Bly
    _____________
    http://pristis.wix.com/the-demijohn-page

 

 

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