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My op-ed on geologic hazards published in Arizona Republic

The Arizona [Phoenix] Republic newspaper published my editorial piece today on geologic hazards in Arizona. This was prompted by the Black Canyon City earthquakes on November 1 which were felt over much of central Arizona. The online...Show More Summary

2.0% of the Tuolumne River Story, Courtesy of the Tuolumne River Trust. And 8-foot-long Saber-toothed Salmon!

Standing on the Dana Fork, close to the headwaters of the Tuolumne River in January of 2012 (when no snow had yet fallen) Rivers often get used as a metaphor for life. Writers might compare the exuberance of youth with the dancing streams and waterfalls at the headwaters of rivers, and the calm deep waters of the big rivers denote adulthood. Show More Summary

Update from the Lake: First Snow!

It was a cold and misty morning, with lots of smoke from wood fires drifting by (cue that wonderful scent that reminds me of fall and winter, but makes my sinuses clog up a bit), when MOH finally got me to drag myself away from the heat of our front-room oil stove. Show More Summary

The Great Valley Museum at Modesto Junior College is Seeking a Director

The Science Community Center at Modesto Junior College is a monument to the importance of science education, with state-of-the-art labs and classrooms for biology, astronomy, chemistry, physics, and the earth sciences, as well as a fully...Show More Summary

The Karst Topography...of California? Into the Black Chasm

California is not really known for her expanses of karst topography, the landscapes that develop where limestone or marble lies underground. In my short mini-series about the karst of California, we've seen the gold-fields of Columbia State Historical Park, the grinding stones at Chaw'se State Park, and the Natural Bridges of Coyote Creek. Show More Summary

Links: Field Tests for Gold and Silver (or other Elements or Metals, and Sometimes Minerals)

After reviewing links on my 2009 blowpipe tests post (spurred on by this recent comment on another post), I decided to do a little more research concerning field tests for gold, silver, and other metals (primarily; some of these links...Show More Summary

The Karst Topography...of California? California has Natural Bridges, and not Just in Santa Cruz

I've been reviewing some of the stops on our recent field studies course through the karst country of California. This landscape is the portion of the Sierra Nevada Mother Lode that is underlain by the marble of the Calaveras Complex. Show More Summary

Read Oakland’s landscape on public transit

This week and next I’ll keep mentioning the scientific blog survey, as follows. Because you are reading this, a science blog, this study is aimed at YOU. The deadline for participating has been extended until November 20: Help us do science. I’ve teamed up with researcher Paige Brown Jarreau to create a survey of Oakland […]

The Karst Topography...of California? Getting Filthy Rich from Karst in Columbia

The Fricot Nugget at the State Mineral Museum in Mariposa, California As I noted in the last post, California has some unique landscapes that are unfamiliar to most visitors, specifically karst topography. Karst results when a region is underlain by limestone or marble. Show More Summary

The Karst Topography...of California? An Exploration of Chaw'se

California can mean a lot of things to people: sunny beaches, snowy ski slopes, glacial canyons like Yosemite, or Redwood forests. But few people ever connect karst landscapes with our fair state. Karst topography? That's a unique terrain that develops when the underlying rock is composed of limestone or marble. Show More Summary

Links: Nevada Highway 8A

8A sign taken by yours truly in 2015 I had a comment on an old post a while back about how there is no more Highway 8A in Nevada, and so how that makes me some kinda liar or irresponsible person or something for mentioning the old road...Show More Summary

One of Those Precious Days, Seeing Half Dome from the Great Valley

Sometimes, it is the context that makes something precious. A drink of water on a hot day in the desert, for instance. A few drops of rain in a crippling drought. In our valley, a clear day is a precious thing. The Great Valley of California is surrounded by mountains. Show More Summary

Aftershock from Black Canyon City quake felt in area

A magnitude 2.2 earthquake occurred last night at 8:33 p.m. about 13 miles north of Black Canyon City, Arizona, according to Jeri Young who manages the states seismic monitoring network at AZGS. We received reports from ranchers in the area who felt the ground shaking. Show More Summary

Fixing What We Broke: A Few Scenes From America's Serengeti Plain

I live in California's Great Valley, also known as the Central Valley. It's one of the most important agricultural regions on Earth, in that it produces around a quarter of the nation's produce. It's an extraordinary geological province, 400 miles of almost perfect flatness. Show More Summary

Future Stories from the Palmetto Moutains

It's 58 miles to the next gas station at Lida Junction on S.R. 266, looking west. In later years —in the future of the 1976 "present" of these ongoing thesis-hunt stories—I made my way back into the Palmetto-Magruder area barely a handful of times. Show More Summary

Arizona earthquake funding denied

The USGS turned down our funding request to characterize the most active fault in Arizona to better understand earthquake hazards. Ironically, the letter informing us that the proposal was denied, arrived just hours after a series of...Show More Summary

Knowland Park knockers II: Rocks other than chert

The distinctive landscape of Knowland Park owes much to its large exposure of Franciscan melange, in which lumps of various rock types stick out of the ground like raisins in pudding (or whatever culinary simile you prefer). A few weeks back I featured the chert knockers, because there are so many, and this week’s subject […]

4.6 million Arizonans shaken by quakes

More than 4.6 million Arizonans live in the areas where people felt the ground shaking from last nights earthquakes near Black Canyon City, according to information posted by Ramon Arrowsmith, ASU geology professor, on his "Active Tectonics" blog - Show More Summary

Reference materials for Black Canyon City quakes

The following online maps and reports are getting lots of attention in the wake of the three earthquakes last night - M3.2,M4.1, & M4.0 - near Black Canyon City, about 45 miles north of Phoenix. All of these are online for free viewing or downloading. Show More Summary

Black Canyon City Earthquake Sequence

The Arizona Geological Survey (AZGS) and Northern Arizona University operate several seismometers throughout the state. Using 15 stations, 5 of which are not currently used by the National Earthquake Information Center run by the USGS,...Show More Summary

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