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Caves in the Coast Ranges? Really? And a National Park? A Peek at Pinnacles

Bear Gulch Cave at Pinnacles National Park California's Coast Ranges hide some real gems (literally: check out benitoite, for instance). One of my favorites is also the nation's newest national park: Pinnacles National Park. The park...Show More Summary

How did we miss this story about vampires in abandoned mines in Arizona?

Well, Arizona, it looks like we had a chance to rid Arizona of vampires in our abandoned mines, but we blew it. Joe Hart won re-election as State Mine Inspector a couple weeks back with over 1 million votes or 98.29% of the votes cast. Show More Summary

Grand Canyon North Rim quake

A magnitude 2.9 earthquake occurred shortly after noon today on the north side of Grand Canyon. The USGS placed the epicenter about 19 miles northwest of Grand Canyon Village, but Dr. Jeri Young who runs the Arizona Broadband Seismic Network here at AZGS, places it further northeast. Show More Summary

The San Juan Bautista Earthquakes as recorded at Modesto Junior College

We have a simple classroom seismometer installed on the third floor of our Science Community Center at Modesto Junior College. It nicely captured the two earthquakes from San Juan Bautista that took place last night just five minutes apart. Show More Summary

Worldwide retreat of glaciers confirmed in unprecedented detail

Taking their name from the old Scottish term glim, meaning a passing look or glance, in 1994 a team of scientists began developing a world-wide initiative to study glaciers using satellite data. Now 20 years later, the international GLIMS initiative observes the world's glaciers primarily using data from optical satellite instruments such as ASTER and Landsat.

4.2 Magnitude Earthquake near San Juan Bautista

What else are you going to call a restaurant situated right on the San Andreas? A 4.2 magnitude earthquake struck at 10:26 PM PST tonight about 3 miles south of the town of San Juan Bautista in the Coast Ranges of Central California (the official USGS report is here). Show More Summary

Investors keep sand operation running on Navajo Reservation

Preferred Sands is one of the largest providers of sand for oil and gas production in the country, and their Arizona plant has the company's largest reserves. According to a story in Reuters, "pr ivately held Preferred Sands produces and distributes frac sand and proppant materials used predominately in oil and gas shale drilling. Show More Summary

Resolution Copper shaft is deepest in North America

Shaft #10 at the Resolution Copper mine in Superior reached its final depth of 6,943 feet (2,116 m). It is the deepest single lift shaft in North America, according to the company. [Right, shaft #10. Photo credit, Nyal Niemuth]The Resolution...Show More Summary

Oh, Nuts. What a Great Reason to Destroy the Remaining 5% of the Original California Prairie

Word comes today in the Modesto Bee that a local "farmer" has been fined $160,000 and ordered to purchase conservation easements worth $1,000,000 after he oversaw the destruction of 33 acres of prime vernal pool habitat. He was in the...Show More Summary

Claremont chert, and other Oakland rocks, in Sunol

The other day I took a field trip to see the construction site of the new dam for the Calaveras Reservoir. (The old dam is being replaced because it’s not strong enough to endure a big earthquake on the Calaveras fault, which runs essentially right through it.) It was a cool time, with fossils and […]

Links: Headwaters of the Susan River and Lassen Volcanic National Park

Geologic Map of Lassen Volcanic National Park and Vicinity, California:main page at USGSGeologic Map of Lassen Volcanic National Park and Vicinity, California:Sheet 1, geologic mapGeologic Map of Lassen Volcanic National Park and Vicinity,...Show More Summary

Fracture-controlled erodibility, great rock climbing

Tuolumne Meadows in Yosemite National Park is an iconic American landscape: It is a sub-alpine meadow surrounded by glacially sculpted granitic outcrops in the Sierra Nevada Mountains. Because of its accessibility and aesthetic appeal, it is a focal point for both vacationers (up to 4,200 people per day) and geoscientists. Show More Summary

Study shows tectonic plates not rigid, deform horizontally in cooling process

The puzzle pieces of tectonic plates are not rigid and don't fit together as nicely as we were taught in high school. A study published in the journal Geology by Corn? Kreemer, an associate professor at the University of Nevada, Reno,...Show More Summary

Felling pine trees to study their wind resistance

Technicians of the Basque Institute for Agricultural Research and Development NEIKER-Tecnalia have in recent days been felling trees to simulate the effect of the wind in mountains in the Bizkaia locality of Artzentales.

Massive geographic change may have triggered explosion of animal life

A new paper by The University of Texas at Austin's Jackson School of Geosciences published in the November issue of Geology suggests a major tectonic event may be connected with the apparent burst of life that occurred 530 million years ago during the Cambrian explosion.

Why did the San Andreas Fault Cross the Road? Why did the Road Cross the San Andreas Fault? 12 Years of Geologic Change

2002 First off, I've been leading geology field studies trips to lots of places in the American West for 26 years. Second, I entered the digital age of photography in 2001, which led to a personal renaissance in picture-taking. I sometimes...Show More Summary

"A City Divided!" "Rift Tears City Apart!" "Slip-Sliding Away!" "Creepiness on the Calaveras"... I Give up: "Calaveras Fault in Hollister"

Blogging has certainly given me some perspective on life at newspapers or internet news services. The title of a piece is all you've got to convince people to click through. I am constantly irritated beyond words at the clickbait out there: "She thought no one was looking. Show More Summary

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