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I see what you mean with it appearing to have thin sides..almost like it could be hollow.
to me it looks like sand coated metal , those edges have the appearance of being thin, I have trouble envisaging the wind producing such an effect on one side..
again , like you said more pictures would be helpful..but then, is the absence of them, telling of something ?
Probably not...
originally posted by: Macenroe82
I showed your pics, the one i thought resembled a rib bone and conch shell, to 2 geologist at my mine site i work at. Both of them told me that hollow bone like structure you found appears to be a coral. (Of course this is just an observation)