Any ideas on this one?

DrGrip

Sr. Member
Apr 12, 2009
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North, Texas
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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.
 

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Harry Pristis

Bronze Member
Feb 5, 2009
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Northcentral Florida
Mosasaurfiend said:
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.
 

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