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AZGS at Mining Day on the Capitol

AZGS participated in the Mining Day at the Capitol in Phoenix on Wednesday, with an informational table, and filming interviews with legislative leaders about mining and mineral resource issues for the next episode of our online video magazine, Arizona Mining Review. Show More Summary

A Very Long Dry Spell (40 Days +) Ends. Please, More Days Like This!

What does it take to make a Walmart parking lot pretty? Atmospheric phenomena is a big help. I spend as little time as possible at Walmarts of any kind, but there was a fast food outlet nearby, and we wanted to eat something before shopping at WinCo, a store that apparently treats their employees with a bit more respect (they own it). Show More Summary

The Sierra Beyond Yosemite: Politics and Geology Square Off in a Town with a Big Problem

Twin Lakes, above the town of Mammoth Lakes on the edge of the Long Valley Caldera So what happened in Mammoth Lakes?In the last post we talked about the titanic explosion at the Long Valley Caldera 760,000 years and tried to comprehend the scale of an event where 150 cubic miles of ash was blown into the atmosphere, covering much of the country. Show More Summary

Chimes Creek and the Hayward fault

Chimes Creek is the second of the three streams in Mills College. It is said to get its name in reference to the college’s church bells. The sound would have traveled up the creek bed to the meadows behind Millsmont ridge. Today the freeway noise drowns them out. Here’s how it looked to the mapmakers […]

More Days Like This Please

Sierra Nevada looking east from the Great Valley. The mountains are in the southern part of Yosemite National Park. I live in one of the most polluted valleys in the United States. The Great Valley of California is a 400 mile long enclosed basin, with the Sierra Nevada to the east and the Coast Ranges to the west. Show More Summary

Mining Day at the Arizona State Capitol

The Arizona Mining Association (AMA) and the Arizona Rock Products Association (ARPA) are hosting Mining Day at the State Capital from 10 a.m. to 2 p.m., Wednesday, February 11, at the Arizona State Capitol. Large mining trucks, tires...Show More Summary

Tucson gem, mineral, and fossil show continues to overwhelm

I've only had time to pop in for a few minutes to a few of the dozens of independent shows around Tucson as part of the Tucson Gem, Mineral, and Fossil Showcase that officially kicked off a week ago. I was taken by the Peruvian pyrite on quartz with sphalerite specimens at the Days Inn. Show More Summary

Making copper the official state metal of Arizona

Arizona has a state fossil - petrified wood, and a state gemstone - turquoise. Under a new bill, SB1441, Arizona would designate copper as the state metal. The list of official state emblems includes: a) state colors- blue and old gold;...Show More Summary

The Sierra Beyond Yosemite: Exploring One of the World's Largest Volcanic Eruptions...Ever. And a Problem

There is a story I tell on the first day of almost every class I teach. It's about a place filled with the evidence of one of the great explosions in Earth history, near Mammoth Lakes in the eastern Sierra Nevada. The students in the...Show More Summary

Smithsonian/USGS Weekly Volcanic Activity Report 14-20 March 2012

3 weeks agoAcademics / Geology : Volcanism

The latest Smithsonian Institution and United States Geological Survey Weekly Volcanic Activity Report has been published by the Global Volcanism Program, covering the week 14-20 March 2012. The report is compiled by Sally Kuhn Sennert. Show More Summary

The Riparian Habitat is Nearly Gone? Aren't There Still Rivers in the Great Valley?

In my last post I talked about how riparian oak woodlands are one of the most endangered ecosystems in California, and I went on about an exploration of one such woodland at Caswell Memorial State Park. One might think that I was saying...Show More Summary

Circle 'Round the Sun in Water Canyon

Yesterday, when out hiking in nearby Water Canyon (before the Super Bowl), MOH and I slowly (at least for me) made our way up a variably steep, grassy to rocky hillside until we came to a large rib of quartzite. While standing thereShow More Summary

Mining claims in Arizona dropped by 9,000 in 2014

Mining claims on federal lands in Arizona decreased by approximately 9,000 in 2014 from their highest level in at least a decade, to the lowest level since 2008. The causes may be in part the lower commodity prices last year, but the...Show More Summary

More aftershocks to Duncan and Oak Creek Canyon earthquakes

We had aftershocks on Wednesday from both of last year's more prominent earthquakes in Arizona.A magnitude 2.5 quake (orange dot on AZ-NM border) is likely an aftershock to last June's M=5.3 Duncan earthquake. It occurred at 3:50 p.m. Show More Summary

Some East Oakland stones

Oakland’s rocks aren’t all in the ground. They’re in our yards and homes, too. Here are a few presented in the order I found them lately. There’s a house on 60th Avenue that stopped me in my tracks, its walls studded with stones. A neighbor down the block told me “Oh yes, those are wonderful! […]

Record rain fills rivers and washes in Tucson area

Friday's record rains in the Tucson area are generating huge flows in the regions rivers, that typically run dry much of the year. The Catalina Mountains received over 5" of rain during the storm. Rain continues this morning. Mike Conway,...Show More Summary

We're #1! - Arizona top mining state again

The Super Bowl in Phoenix tomorrow may be getting most of the attention this week but in the mining industry, Arizona just moved into the championship role.Arizona is the #1 mineral-producing state (non-fuel) in the U.S. for 2014, according to a new report from the US Geological Survey. Show More Summary

One of California's Most Precious and Endangered Ecosystems: Riparian Oak Woodlands

Sunset at Caswell Memorial State Park Ask people who know California what ecosystem has declined in area by more than 90%, and chances are they will answer "the Redwood forests". And they would be right. But given that there were once...Show More Summary

The Sierra Beyond Yosemite: Wait! Is that...a Glacier?

People who visit Yosemite Valley often think about glaciers. Even those with no geologic background quickly become aware of the role of glaciers in forming the valley, but the thoughts are often of the past. It's been 11,000 or 12,000...Show More Summary

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