Category Archives: Geology

A River Runner’s Guide to Grand Canyon Geology IV: Whither the Supergroup?

We left off the last post having seen the complete Supergroup sequence of over two miles of Neoproterozoic and Mesoproterozoic sediments. The river never encounters the Neoproterozoic part, roughly half. These lie above the river on the North Rim side … Continue reading

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A River Runner’s Guide to Grand Canyon Geology III: The Supergroup

A typical visitor to the Grand Canyon looks down from the rim through about a mile of sediments to the river. Most of these are Paleozoic sediments extending back about 515 million years. They appear to be level, although in … Continue reading

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Entropy and the Grand Canyon

It has been our good fortune to row 280 miles of the Colorado River through the Grand Canyon twice in the last seven months. This is rare for private boaters limited to one trip per calendar year and subject to … Continue reading

Posted in Geology, Grand Canyon, Paleoclimate, Paleogeography | 1 Comment

Differential Motions of the Continents, Mesozoic and Cenozoic Eras IV: Constraints

We know the position and velocity of stable points on our six cratons. A reasonable question to ask is, “Can we account for this motion?” Above is a map of the ocean floor created in the last 10 million years. … Continue reading

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Shiprock

This picture was taken in September 1979. There is a print of it in my office, faded a bit. When I wax geological, the sheer improbability of this mineralogically unusual salient weighs heavily. High in Magnesium, Potassium and Sodium; low … Continue reading

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Oil and the Devil

  The concept of the devil in the Judeo-Christian/Muslim tradition seems to have its roots in an older Persian and possibly Indo-European notion of opposing forces of good and evil. The Christian conception developed into the elaborate scheme described by  Dante which was integrated into … Continue reading

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The State of the Onion

Let’s say the way this planet works is an onion. There are many layers and they interact in ways far more complex than onion rings. Yet we have to start somewhere, and peeling back the layers of this onion can … Continue reading

Posted in Climate, Geology, LLSVP's are Doughboys, Magnetic Reversals, Moho, Oceanography, Seismic Tomography | Tagged | Leave a comment