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It's the same principle. Sand in MN and WI is from prehistoric shorelines when the inland US and Canada were covered by a shallow sea. Ironically the same sea t
by throwaway5752 12y ago
It's the same principle. Sand in MN and WI is from prehistoric shorelines when the inland US and Canada were covered by a shallow sea. Ironically the same sea that produced the shales that the fracking sand deposits are being mined to exploit.
- beat 12y agoThis sand in particular is from a flood-prone river valley (the Minnesota River), so speaking as IANAG (I am not a geologist), I suspect it was brought there from elsewhere upstream and deposited over thousands of years.