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Driving Through the Most Dangerous Plate Boundary in the World: Into the Realm of the Drowning Dinosaurs

The sediments of the Great Valley Group form the parallel ridges trending diagonally across the photograph. California has a lot of potential for geological mayhem, with the San Andreas and many other faults, mountain-building, and volcanoes of many kinds. Show More Summary

Driving Through the Most Dangerous Plate Boundary in the World: Exploring the Oceanic Crust Without Unobtainium

One of the movies I most love to hate is "The Core". There are plenty of ridiculous parts, there are several earnest geologist characters, there are the many gory deaths while the heroes save planet Earth from being severely microwaved...Show More Summary

Tis-sa-ack (Half Dome) From Some Different Angles

Tis-sa-ack (Half Dome) from Glacier Point Tis-sa-ack is, along with Yosemite Falls and El Capitan, Yosemite Valley. The iconic rock stands high above the east end of the valley, rising to 8,839 feet (2,694 meters), just short of a vertical mile above the valley floor. Show More Summary

Is This the Best View from a Tunnel Anywhere? And Other Slightly Unfamiliar Views of Yosemite (and Gratuitous Bear Cub)

I did something a little different this last weekend for Mother's Day. I found there was a single campsite available in Yosemite Valley on Sunday night, so we headed there for a little explore. I also did something just a little bitShow More Summary

Mineral recovery from geothermal fluids

The US Dept. of Energy is seeking input on technological approaches to recovering minerals from geothermal fluids. The Request for Information: Geothermal Approaches to Validate Mineral Recovery is posted below: Geothermal fluids may...Show More Summary

An Invasion of Ents? No, Just the Biggest Living Things on the Planet

Giant Ent toes. Or Imperial Walkers. Run for your lives! There are things in Yosemite National Park other than Yosemite Valley. One of the gems (out of a great many) is the Mariposa Grove, a forest of about 500 gigantic Sequoia Trees near the south entrance of the park. Show More Summary

Siberian Haze in North-Central Nevada

It is often — more commonly than in the past, IMO — hazy or dusty in north-central Nevada where I routinely work and often travel, here and there across basins and over ranges. And in summer and fall (and probably much earlier this year...Show More Summary

Butters Canyon serpentinite

I will continue to focus on serpentine rock—serpentinite—for a while longer because I’ve been visiting it a lot lately in Oakland. This post shows some exposures in the lobe of serpentinite mapped just south of Joaquin Miller Road. This bit of the geologic map shows where we are, and the five numbers are where I […]

Copper price rebound aids Arizona companies, mines

After copper dropped to its lowest price in five years at the end of 2014, it's not only less volatile, but even rising. Copper inventories do not look to be excessive which bodes well for copper producers. [Photo credit, Freeport McMoRan] Prices of copper miners have also rebounded. Show More Summary

Field trip guide to Oak Creek - Mormon Lake graben now online

The geologic field trip guide for the "Oak Creek-Mormon Lake Graben, North-Central Arizona by Paul Lindberg, 12 p. (May 2015)" is now posted online by the Arizona Geological Society http://tinyurl.com/AGS-Spring2015-FieldtripAccording...Show More Summary

Driving Through the Most Dangerous Plate Boundary in the World: At the Portal of Hell in the Diablo Range

At the portal of hell? For the miners who once worked these tunnels, it was... I miss the tabloids sometimes. Sure, there's the Onion, which gets mistaken for real news sometimes. But there was nothing like standing in the grocery store...Show More Summary

Minerals on eBay not from museum collection

A pallet of minerals for sale on eBay last fall was listed by the seller "This wonderful collection of minerals is the display from the Arizona Mineral Museum from Curator Lee Hammon," who it turns out was a curator at the Arizona Mining...Show More Summary

Sail on, sweet ship - flooding on Oak Creek

The USGS posted a short video on YouTube showing flooding on Oak Creek on March 2, 2015. Note the trash dumpster floating by.

New data model released for mineral brines

AZGS has officially released a new National Geothermal Data System (NGDS) interchange format (or Content Model) for “ Mineral Recovery Brines ” for a total of 36 data models relevant to geothermal energy exploration and development - http://schemas.usgin.org/models/ The US Dept. Show More Summary

Now, about those bodies in the Colorado River...

The report of human remains in the Colorado River in La Paz County brought out the sheriff's and fire departments. Divers went down and found two fake skeletons propped up in lawn chairs on the river bottom, according to a story in the Parker Pioneer newspaper. Show More Summary

Sharing Science in the Local Community: What Ideas Do You Have?

How often do you wish you had a blank slate? The term can have many meanings and contexts, but most often it means the chance to start over, or to start a project free of restrictions. That in essence is what you see in the pictures in this post. Show More Summary

Revised locations of Oak Creek Canyon earthquake aftershocks

The locations of the two Oak Creek Canyon earthquake aftershocks are further north than reported by the USGS. AZGS geologist Jeri Young recalculated the positions using additional stations from the AZGS-run broadband seismic network.The yellow pins mark the USGS locations with the 5-3-15 M=2.6 event and the 5-5-15 M-3.2 event. Show More Summary

Oak Creek Canyon - Kachina Village aftershocks

There have been two notable Flagstaff-Sedona area earthquakes since Sunday, both likely aftershocks from the November 30, 2014, M=4.7 earthquake that occurred in Oak Creek Canyon near the Kachina Village area between Flagstaff and Sedona.A magnitude 3.2 event occurred at 2:04 a.m. Show More Summary

Oakland’s serpentinite patch

Oakland’s serpentinite patch is the snaky zone shown in deep purple on the geologic map. I’ve written many posts about individual localities, but this is the first time I’ve shown and talked about the whole thing. Here’s the same area in Google Maps terrain view, for reference. The rock doesn’t have a strong expression in […]

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