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    Thanks I assumed that it was something more...

    Thanks I assumed that it was something more practical than a shovel and a long rope, but really had no idea how to find such information. If I find a good rock, I'll check out the USGS.
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    Pardon my ignorance but how did you determine it...

    Pardon my ignorance but how did you determine it to be 700' thick? I guess "thick" does not necessarily mean "deep?"
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