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Driving Through the Most Dangerous Plate Boundary in the World: Exploring the Underside of the Volcano

20 hours agoAcademics / Geology : Geotripper

Quick, name the nation's oldest national park. I'll even give you a clue, it starts with 'y'. Did you guess Yellowstone? You are right. Did you guess Yosemite? You are also right, in a sense. Have you ever said "Yosemite" when you meant "Yellowstone"? I've done that plenty of times. Show More Summary

Better management of wildfires in Arizona

It's been a good year for fire management in Arizona, says AZGS geologist Dr. Ann Youberg. Ann is our resident expert on dealing with post-fire effects including debris flows, mudslides, and related hazards. She's often on the ground...Show More Summary

Johnson Camp copper mine plans to resume operations, open 150 jobs

News reports say that the bankrupt Johnson Camp copper mine in Dragoon, could be sold by the court receiver by mid-July to a Hong Kong based company and reopened after that. [Right, view of pit. Credit, Nord Resources]The Willcox Range...Show More Summary

Governor appoints members to Oil & Gas Conservation Commission

Gov. Doug Ducey reappointed four members and one new member to the Arizona Oil & Gas Conservation Commission. This is the first time in a number of years that all the positions are filled.The AZOGCC consists of five members appointed by the Governor and one ex-officio member, the State Land Commissioner. Show More Summary

Driving Through the Most Dangerous Plate Boundary in the World: A Tale of Two Subduction Zones

To many people, the Sierra Nevada means granite. The Sierra Crest, with towering peaks of granite carved by glaciers. Yosemite and Hetch Hetchy valleys, with vertical walls of granitic rock. Lake Tahoe, surrounded by granite peaks. Those who visit the mountains find "granite" to be three-quarters true. Show More Summary

Driving Through the Most Dangerous Plate Boundary in the World: A Landscape Buried in Hot Mud, and a 6-foot Long Saber-tooth Salmon

Mt. Shasta is a big mountain. A really big mountain. Reaching an elevation of 14,179 ft (4,322 m), and rising nearly 10,000 ft. (~3,000 m) above the surrounding terrain, it has a volume of around 100 cubic miles. As such, it is the biggest...Show More Summary

AIPG seeking candidates for Executive Director

The American Institute of Professional Geologists is accepting applications for the position of Executive Director. The position is to be filled as soon as a qualified candidate is vetted. Applications will be accepted until the position is filled. Details can be found at

Look West, Young Man (and Everyone Else): It's a Conjunction!

There are interesting things happening in the western skies this week. All month, there have been two bright objects in the evening sky, getting closer and closer. They aren't really getting physically closer, as Jupiter is far beyond Venus, but their line of sight is making them appear close together. Show More Summary

El Niño Near Long Valley Creek, Lassen County, CA

I've got a few more pictures from that rainy May day, the 21st, when MOH and I were on what was really the first leg of a trip to Colorado and back. A downpour over unnamed hills just off the north end of the Bald Mountain Range and just south of Beckwourth Pass. Show More Summary

Shepherd Canyon: Type localities of Oakland rocks

Yesterday I led a walk for the group Wild Oakland that took in the rocks of lower Shepherd Canyon, which are the westernmost outcrops of the Great Valley Sequence. These are the same kinds of rocks that make up the monumental set of ranges marching up the western side of the Central Valley from Taft […]

Home From the Back of Beyond: Some Images of Strange and Wonderful Places

Thunderstorm near Bandelier National Monument No, it's not a volcanic eruption, but with the light show that followed that evening, it might as well have been. We were in the high desert of New Mexico at Bandelier National Monument, and the monsoons had arrived early. Show More Summary

Jerome's Sliding Jail landslide is moving

In the 1930s a landslide in the center of the city of Jerome is credited with moving the jail house hundreds of feet downslope. In fact, the building was moved to get it on more stable ground. But this spring, part of the landslide started moving again. Show More Summary

"Arizona Mining Review" covers breccia pipe uranium, USGS mineral resource plans

The June episode of Arizona Mining Review is now on YouTube at interview with Dr. Jon Spencer, Chief Geologist here at AZGS, about his new report on potential uranium-bearing breccia pipes in northwest Arizona is drawing a lot of attention. Show More Summary

New report indicates massive increase in uranium potential in northwest Arizona

We released our new report yesterday “ Partial database for breccia pipes and collapse features on the Colorado Plateau, northwestern Arizona ” ( ) that found concentrations of breccia pipes 10 to 100 times higher than previously known, in two test study areas. Show More Summary

A Watering Hole Bites the Dust: Water Hole #1

Water Hole #1 in Golconda, Nevada — a bar made famous in the late 1970s by an industrious pig, Waterhole Ike — closed sometime within the last two to three years, before I had a chance to stop by and check out their beer collection. Water Hole #1 and attached grocery store in March, 2015. Show More Summary

New exhibit of historical mining maps opens in Tucson

The Arizona Historical Society has opened a new exhibit in Tucson of the map collection of Robert Lenon. Robert Lenon was a surveyor and mining engineer from Patagonia, Arizona. In addition to creating a vast number of maps depicting...Show More Summary

On Oakland’s blueschist

It may seem like I have a fixation on blueschist. I’ll admit that. I have a fixation on every rock type. Here’s a fine blueschist boulder at the very north end of Castle Drive, in the Piedmont Pines neighborhood. This qualifies as a knocker, and it also qualifies as a high-grade block. “Knocker” is local […]

Bill introduced to overturn Resolution copper mine land exchange

Two Arizona congressmen, Raul Grijalva (Tucson) and Ruben Gallego (Phoenix), introduced legislation to reverse the federal land exchange that is allowing the giant underground Resolution copper mine to be developed near the town of Superior. Show More Summary

State Geologists field trip into Petrified Forest National Park back country

The post-meeting field trip for the 107th Annual Meeting of the Association of American State Geologists (AASG) went to Petrified Forest National Park and Meteor Crater last Thursday.Park naturalist and paleontologist Adam Marsh ledShow More Summary

State Geologists annual meeting underway in Flagstaff

AZGS is hosting the 107th Annual Meeting of the Association of American State Geologists (AASG) in Flagstaff this week. Over 150 attendees are participating from state geological surveys, federal counterparts, professional organizations, and industry. Show More Summary

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