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Dizzard, you asked about banding

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This  is an agate. It is not typical but you can see some banding i will posr another.

asked Oct 19, 2015 by Weasel (35,750 points)

1 Answer

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Bottom rock is puddingstone, formed by many rocks during the ice ages during an alluvial flow. For instance, this one has the familiar quatz, a lake superior agate and jasper readily visible. The whiteish rocks are quartz, the red ones jasper and the host rock itself. This rock is 250 lbs. According to my research, these were formed when melting glaciers runoff waters eroded hillsides and washed the different rocks down the hill, where they reformed into concrete from the sand, silicates and water into rocks like these. Many rocks were moved from the Canadian Shield all the way down to Arkansas by the glaciers and deposited like this as the glaciers receded. This does not explain how Dizzard's rock was formed, it just illustrates how many rocks became one
answered Oct 26, 2015 by Weasel (35,750 points)
 


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