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The Sioux Quartzite

The Sioux Quartzite, deposited more than a billion years ago, is among the oldest rock exposed in South Dakota. The quartzite and associated pipestone deposits were known to white men as early as...

The Sioux Quartzite, deposited more than a billion years ago, is among the oldest rock exposed in South Dakota. The quartzite and associated pipestone deposits were known to white men as early as 1822, but the American India  used pipestone centuries earlier to make ornaments and utensils.

Submitted by: @chrytonbaine

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