Tag Archives: Black Hills

The Black Hills, Part 4

If you’ve been following my first three installments on the Black Hills (Mesozoic, Paleozoic, and Proterozoic rocks) it should be clear by now that the Black Hills rocks are layer out in a series of concentric rings that get progressively … Continue reading

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The Black Hills, Part 3

As we saw in the last post, the Black Hills are surrounded by a ring of Mesozoic and Paleozoic sedimentary rocks that get progressively older toward the interior of the Black Hills. However, after just a few kilometers we’ve passed … Continue reading

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The Black Hills, Part 2

In Part 1, we saw that the Black Hills are surrounded by the Red Valley, which gains its color from the Triassic Spearfish Formation. The outer wall of the Red Valley is made of Jurassic and Cretaceous sediments. But what … Continue reading

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The Black Hills, Part 1

After leaving the Badlands, Brett, Tim and I headed west toward the Black Hills. As the Google Earth image above shows, the Black Hills are an isolated mountain range, roughly elliptical in shape with the long axis running northwest-southeast. The … Continue reading

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