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In response to
"Is it a function of glacial activity? -- nm"
by
Beryllium
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sedimentary collection, compression. often a bit of fossil action going on.
Posted by
zeitgeist (aka zeitgeist)
Feb 16 '09, 00:45
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usually in the middle of a aggregate type rock is a fossil, that some dead thing rolled around in some slime and got a lot minerals attached as the ball gathered more goo and stuff, finally it eventually hardens.
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