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Wandering Through a Sand Wilderness

To a child who was raised along the beaches of Southern California, the Oregon coast comes as quite a shock. Beaches to me were places like Huntington or Balboa, where wall-to-wall people struggled to claim a few precious square feet...Show More Summary

More From the Road: The Colorado River Aqueduct

When I drove to the area on the south side of the Whipple Mountains where I ended up camping amidst downpours and nearby lightning, I thought I'd grab a few photos of the Colorado River Aqueduct, which passes through just north of CA Highway 62 on its way to the greater L.A. Show More Summary

New study describes 200 million years of geological evolution

200 million years of geological evolution of a fault in the Earth’s crust has recently been dated. Published in Nature Communications, these new findings may be used to shed light on poorly understood pathways for methane release from the heart of our planet.

Trump's Presidency Will Be a Disaster for Public Education

The choices Trump is making bode ill for STEM education - and all public schools. -- Read more on

Cyclic change within magma reservoirs significantly affects the explosivity of volcanic eruptions

A new study published in Geology uses pockets of melts trapped within crystals to understand the conditions occurring beneath volcanoes before explosive eruptions.

Fog Returning to the Great Valley...Maybe

The fog here in the Great Valley is legendary. The so-called Tule Fogs can last for weeks, hiding the land in an impenetrable mist. People who would panic at the thought of driving with their eyes closed continue to speed through these fog banks where the visibility is measured in feet rather than tens of feet. Show More Summary

History of the Morenci Mining District, Greenlee County, Arizona

Smelter of the Detroit Copper Mining Co., ca. 1896. The definitive mining history of Arizona's iconic Morenci mining district by geologist David Briggs is now available online at More Summary

Small Magnitude Earthquakes in NW Arizona 22-25 Nov 2016

Three (3) small magnitude earthquakes occurred in northwestern Arizona over the past week. The largest event was M 2.2, ~ 22 miles south of Colorado City, AZ, on 22 Nov. at 7:31 pm. USGS estimates the focus (depth) at 13.3 km. On the included map, yellow circles represent earthquake epicenters. Show More Summary

The Left-Lateral Strike-Slip Garlock Fault Near Highway 395

While out on the last road trip, I started taking pictures from places where roads crossed the Great Basin Divide. Unfortunately, I soon gave that up because freeways, which I traveled not exclusively but considerably, are lousy places from which to take pictures. Show More Summary

Oakland building stones: Lime stones

There isn’t a good word for the full variety of carbonate building stones — limestone, dolomite, marble, marlstone and travertine. Although I like the word limerock, it apparently doesn’t really exist. In any case, these rocks aren’t very common in Oakland’s buildings, the way they are in, say, Washington DC (all of those memorials, and […]

The Light of Science

Those who claim ignorance is bliss don't know a thing. -- Read more on

Links: Here Are a Few, But Great, Great Basin and Great Basin Divide Links

Great Basin—Mojave Desert Region - the hydrographic, physiographic, and floristic Great Basin (GB) regions and climate; v. good map of vegetation zones, lots on flora and fauna; pretty good map of the GB itself although it goes all the...Show More Summary

Monitoring the California Drought, Via the Road

There are two ways to evaluate and monitor a drought. There's the usual method, where people use data on precipitation, snowpack level and streamflow discharge and all that, and it's all well and good. But there's also the Geotripper method of looking at Mt. Show More Summary

From the Road: A Joshua Tree Lunch Stop with Volcanic Rocks

It wasn't long after I stopped to make coffee on the Turtle Mountains road, that it was time for lunch.(Actually, before I found a place for lunch, I mistakenly pulled off on the paved road to McLaughlin, thinking that I could get aShow More Summary

The Real Story of Plymouth Rock

Learn about the erratic past of one of America's most famous rocks. -- Read more on

Wishes for a Happy Thanksgiving, and Safety for Those on the Road (Plus new pictures from Pinnacles National Park)

Here's hoping that you all have a fine Thanksgiving holiday and that your travels are safe and fun. I offer up one of the things that I am truly thankful for: politicians that put aside their many differences and agreed to establish Pinnacles National Park in 2013. Show More Summary

Titus Canyon: The Klare Spring Breccia

Klare Spring in Titus Canyon is well known as a petroglyph site (with a sign and everything); it is less well known as a breccia site and as a place to view the low-angle normal faults of the Titus Canyon fault zone (TCFZ). MOH and I...Show More Summary

The Resilient Oakland Playbook

Last month the city of Oakland released its long-awaited resilience plan, the Resilient Oakland Playbook. “Resilience” is the 21st-century name for the concept that communities can get up quickly when they’re knocked down, and avoid being knocked down in the first place. I’ve always thought of resilience in terms of how we deal with natural […]

Links: The Sump, Nevada

This is about as close as I've gotten to The Sump, a place in Nevada that I had never heard of until I was doing some research into stops for our Death Valley trip of last February. And mind you, the declivity I've pointed out in the photo above is just the southern entrance to this apparently intriguing place. Show More Summary

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