Category Archives: Grand Canyon

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

Posted in Geology, Grand Canyon | Leave a comment

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

Posted in Geology, Grand Canyon | 1 Comment

A River Runner’s Guide to Grand Canyon Geology II: Muddy Creek and the Formation Problem

One might think that by now we would understand pretty well how the Grand Canyon formed. We don’t. Central to the problems of how and when the current Grand Canyon formed is the Muddy Creek Formation, a bunch of freshwater … Continue reading

Posted in Grand Canyon | Leave a comment

A River Runner’s Guide To Grand Canyon Geology

River runners have a different perspective on Grand Canyon geology. Remarkably, the put in at Lee’s Ferry is above the entire Grand Canyon sequence, and all the strata seem to emerge in turn from the river. The Kaibab Limestone that … Continue reading

Posted in Grand Canyon | 1 Comment

Entropy and the Grand Canyon II

We left off in the last post having boated 78 miles, about five days on a typical trip, and having encountered the last of the suite of three books that comprise the geological story revealed in the Grand Canyon. We … Continue reading

Posted in Geological Evolution of the Western United States, Grand Canyon, Paleogeography | Leave a comment

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

River of Time

I’ve been rowing the Grand Canyon for about a month. Sixteen of us were on the river for 20 days. It takes a couple days to drive there and a couple more to drive back. It takes a day to … Continue reading

Posted in Grand Canyon | Leave a comment