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  1. #1
    us
    VTGoldProspector aka Corey

    Jun 2012
    Eastern Long Island
    Google Earth, my hands and a pan!
    74
    3 times
    Prospecting

    Question Please help identify this rock -GRAND CANYON-

    I found it in the Grand Canyon last year 3/4 the way up the west side of a hill (1300-1400' altitude) around 100 miles east of Las Vegas. It's original shape was parabolic as if it was splattered from an event (like a dinner plate). This is just a nice section of it. It was about 14" diameter and about an inch thick in the center. I did find another similar specimen very close by and were both on the surface and both shaped the same. The 3 photos included show the "slag" that was predominantly on the edges, the color and texture of the top as well as the white bottom. Any ideas?

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  2. #2
    us
    Mar 2011
    204
    60 times
    Check out the thread, Is this flint?
    About halfway down someone posted pictures of Florida fossilized coral. It looks very similar to what you found.
    They do find coral in the Grand Canyon.
    Some corals are shaped like jellyfish.

  3. #3
    us
    VTGoldProspector aka Corey

    Jun 2012
    Eastern Long Island
    Google Earth, my hands and a pan!
    74
    3 times
    Prospecting
    I searched and manually browsed for "Is this flint?" without any luck,,, how about the user that posted it or a link... thanks.

  4. #4
    ca
    Mar 2005
    London, ON
    495
    21 times
    Last edited by gord; Jul 10, 2012 at 09:02 PM.

  5. #5
    us
    VTGoldProspector aka Corey

    Jun 2012
    Eastern Long Island
    Google Earth, my hands and a pan!
    74
    3 times
    Prospecting
    It not metallic. Seems like silica and calcium based. With the texture of the top I guess it could be coral... but both specimens were on the surface, not partially buried in any way as if it was a fossil of any type. A "splattered" event on the hillside supports it's shape on loose soil and why they were parallel to the inclined grade (as if they were deposited onto the existing & current topology, geologically speaking). Both were identical except for the 2nd one was a little smaller estimated 40 feet away..

  6. #6
    us
    VTGoldProspector aka Corey

    Jun 2012
    Eastern Long Island
    Google Earth, my hands and a pan!
    74
    3 times
    Prospecting
    To be clear, this is only a section of the entire find. The white side (bottom) photo shows the curve of its overall parabolic shape (concave) from which the sample was taken.

  7. #7
    us
    TerrySoloman.com

    May 2010
    Congress, AZ - White Plains, NY
    Tesoro Cult Member - Tejon; Sand Shark; Lobo Super Traq; Vaquero; Cibola; Compadre - Minelab GPX 5000
    5,811
    3096 times
    Metal Detecting
    Looks like a piece of petrified sand dune..
    Please visit my Website http://TerrySoloman.com

  8. #8
    us
    VTGoldProspector aka Corey

    Jun 2012
    Eastern Long Island
    Google Earth, my hands and a pan!
    74
    3 times
    Prospecting
    Quote Originally Posted by Terry Soloman
    Looks like a piece of petrified sand dune..
    I am by no means an expert but I have doubts about that theory. Any other ideas?

  9. #9
    se
    Sep 2006
    Sweden
    White's or Minelab
    3,886
    228 times
    All Types Of Treasure Hunting
    It does look like some kind of chalcedony.
    Geologists are gneiss, tuff, and a little wacke.

  10. #10
    LRL fraud debunked

    Dec 2010
    ciudadano del universo, residente de El Paso TX
    BS detector
    1,059
    223 times
    Underground detection
    A chunk from a calcareous soil horizon ("caliche") where some of the calcite has crystallized into a semi-transparent form?

    --Dave J.

  11. #11
    us
    Jul 2012
    San Antonio, Texas
    Garrett 250
    2,728
    1165 times
    Research and occasional field work
    Believe it is/was a coral geode. Outer part looks like limestone. If this is right, it is interesting, but not sure about the value. I think that Bajahunter was correct all along.
    Last edited by austin; Jul 14, 2012 at 10:49 PM. Reason: coral, not calcite

  12. #12
    us
    VTGoldProspector aka Corey

    Jun 2012
    Eastern Long Island
    Google Earth, my hands and a pan!
    74
    3 times
    Prospecting
    Can someone supply me with links to photos to compare to.. With the chalcedony/coral ideas, it was found in a "cow patty or upside down dinner plate" shape with the dark textured surface face up (slag on the bottom and edges) inverted from what a geode would be. I can believe it may have been a geode at one time but what would explain its current shape? I also question why I found 2 very close to each other without looking very hard. Leads me to believe there were others. For what ever reason I still can't seem to find the thread that Bajahunter was talking about.

  13. #13
    us
    Oct 2011
    Southern Minnesota
    51
    20 times
    All Types Of Treasure Hunting
    Quote Originally Posted by vtgoldprospector View Post
    I still can't seem to find the thread that Bajahunter was talking about.
    Greetings vtgoldprospector,
    I think this might be the thread Bajahunter was referencing, link to post #11: any ideas im thinking maybe flint

    It does look quite similar to what you found.

  14. #14
    us
    Mar 2011
    204
    60 times
    Prospector
    Gord posted the link to the thread already.
    any ideas im thinking maybe flint
    The rocks you should look at start at post number 11 in that thread.
    They are completely different than the flint/chert rocks that were the original topic.
    I can't ID based just on the pics. It does look like some kind of chalcedony to me.
    I doubt if it changed shape since it was formed.
    Rob

  15. #15
    us
    Jul 2012
    San Antonio, Texas
    Garrett 250
    2,728
    1165 times
    Research and occasional field work
    Check out coral geode on google images. There are probably many more, some smashed, some still buried. Value?

 

 
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