[Jewelry making - Article 00277] - Re: [Orchid] Stones on Demand

[Helen Hill]

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>     An outcropping of about 50 strata which I think are marine
>     sediments from about 100 mya. A few are strata of loose earth. What
>     prevented their solidification? 

    In simple terms (not because I think you need simple terms, but
    because that's the only kind I can offer on geological matters),
    their location, ie an outcropping means there is a lack of rock
    above, pushing down on the layers and by the same token, a lack of
    geothermal heat. The deeper such layers get pushed down into the
    earth, the more heat and pressure they are subjected to and therefore
    the more likely they'll be to turn into solid rock. 

    Google the rock cycle. 

Helen
UK
http://www.hillsgems.co.uk
http://www.helensgems.etsy.com
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