Thursday, August 9, 2012

Re: [Geology2] very interesting mystery rock



Lin,

You wrote:
 

My vote is that it's a fossil, given the pattern of segmentation, and it reminded me of one particular type of fossil invert. I finally found the name of it, too. Here it is:

http://www.fossilmuseum.net/fossils/Crinoids/Uintacrinus-socialis/Uintacrinus.htm


Note that with crinoid stems, the segments are more uniform in size and only vary gradually along the length. In the mystery rock, they are quite irregular. That makes my vote for it being a pseudofossil.

Chuck


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