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Board of Technical Registration review of assayer, geologist de-licensing legislation

The newsletter of the Arizona Board of Technical Registration includes commentary by the Board's Chair and it's Executive Director on the recent legislative session that included attempts to de-license geologists, assayers, and certain...Show More Summary

Mineral Monday: Close-Ups of Bullfrog Ore from the Original Bullfrog Mine, Nevada

I collected this hand sample from the Original Bullfrog mine, Nye County, Nevada, sometime back in the mid to late 1980s when doing recon in the area, then cut and polished it—probably with a company saw and grinding wheel. This specimen...Show More Summary

Oakland geology ramble 1, Leimert to Redwood

For a while now I’ve been envisioning geological rambles around Oakland — walks (hikes, really) that aren’t loops, but traverses. They rely on public transit, because that’s mainly how I roll. You can walk them in either direction. My ultimate idea is to work out a network of rambles that will cover the whole town. […]

Early 1900's notebooks from F.L. Ransome found during packing

In packing for our move to to the University of Arizona at the end of the month, we ran across the original Tombstone geo-notebooks of F.L. Ransome. Ransome was a famous economic geologist with the US Geological Survey. His Tombstone journals date to 1906 and 1911-1912. These are treasures that we will keep in a safe place. [Photos by Mike Conway, AZGS]

Pele is a Capricious Goddess...Today She Dispensed a Gift

Halemaumau, on the Kilauea volcano in Hawaii, is a crater within a caldera that has been simmering away for most of the last seven years. The pit is around 600 feet across, and a few hundred feet down (on most days) there is a roiling lake of molten basalt. Show More Summary

Helium production resumes in Arizona

Ranger Development has begun production of helium from the old Navajo Springs field near Holbrook in eastern Arizona. [Photo credit, Ranger Development]Arizona helium fields are among the richest anywhere in terms of concentration of...Show More Summary

Random Nature Notes from Hawai'i: The Land Reptiles of the Big Island

Reptiles (aside from sea turtles) are probably not native to the Hawaiian Islands but there are quite a few of them on the islands today. Some were brought by the original Polynesian settlers (four species of Geckos). Others arrived as escaped pets. Show More Summary

Spectacular dashcam video of Arizona meteor

The following video is a dashcam view of the meteor that came down over Arizona just before 4 a.m. local time on June 2. It is posted online at's the most spectacular one I've seen, as it seems to be heading right for the camera.

When You Say "He's Older Than the Hills" and You're Right....Pu'u Pua'i in Kilauea Iki

It's true! I am two years older than the mountain behind me. This is Pu'u Pua'i, a cinder cone that grew during the Kilauea Iki eruptions of 1959 in Hawaii Volcanoes National Park on the Big Island of Hawaii. It must have been a sight to see. Show More Summary

Arizona meteor explosion caught on seismic monitors

The explosion of the meteor that flashed across central Arizona at about 4 a.m. this morning was recorded on our earthquake seismic network. The seismic record is from the Payson-Strawberry station. The American Meteor Society, a non-profit...Show More Summary

Monday's Minor Mystery Solved Pretty Quickly: Poles with no Shadows in Hawai'i

You can't mystify scientists of the Earth with questions of latitude. I had numerous answers pretty darn quick about why this stop sign reveals my location. The sign pole is casting no shadow! The only way that can happen is if the sun is directly overhead, and that can only happen if one is within 23 degrees of the equator, and only at noon. Show More Summary

Late arrival to northwest Arizona's earthquake swarm

This weekend I suggested that the earthquake swarm in northwest Arizona might have come to its end. We had not recorded any events for a week.But last night at about 9 p.m. local time, there was a magnitude 1.3 quake in the swarm area. Show More Summary

Preservation of historical mining files and library underway

We have implemented a plan to preserve the extensive mining files and the bulk of the geological-mining library in our Phoenix office, before it is shut down on June 30.The 800,000 pages of mining reports, 10,000 maps, and 7,500 photos, will be moved into storage at the former mining and mineral museum just east of the State Capitol in Phoenix. Show More Summary

New publication on Geology of Santa Catalina Mountains, available for free downloading

AZGS has released a new online publication in our Down to Earth series. "A Guide to the Geology of the Santa Catalina Mountains, Arizona: The Geology and Life Zones of a Madrean Sky Island," by John Bezy isa non-technical treatment of the geology and ecology of the Santa Catalina Mountains outside Tucson. Show More Summary

A Most Misunderstood Island: One of the Most Diverse Landscapes on Earth

Shall we start with a stereotypical Hawaiian beach? One can certainly be forgiven for thinking that Hawai'i is a group of high-rise hotels next to a wide sandy beach. It isn't as if a string of television shows (Magnum, P.I. and Hawaii 5-0 for example) have spent decades putting that stereotype into our heads. Show More Summary

The Approach to Titus Canyon: Amargosa Narrows, Bullfrog Pit, and the Original Bullfrog Mine

We're officially on the Titus Canyon leg of our larger Death Valley trip—a round trip odyssey that will take us to and near a number of places. This section of our journey began with the last post, which was centered around Beatty. I’ll...Show More Summary

Going out of business sale at AZGS "Arizona Experience" store

The Arizona Experience store will close by the end of June when AZGS is transferred to the University of Arizona. We are working with the UA Stores to carry AZGS's own geologic publications for sale after the transfer, but our otherShow More Summary

Free to good home - 50+ years of GSA and AAPG bulletins

I am cleaning out my own library in preparation for the AZGS move to the University of Arizona. I had amassed a pretty comprehensive collection of Geological Society of America and American Association of Petroleum Geologists bulletins over the years. Show More Summary

AZGS transfer to University of Arizona - update

We have been working non-stop the past week with University of Arizona and State of Arizona officials on transferring the Arizona Geological Survey from the State to the University. On Friday, the Arizona [Tucson] Daily Star, ran a front...Show More Summary

Land subsidence maps for Arizona updated

The Arizona Dept. of Water Resources has updated land subsidence maps for the state on ADWR's w ebsite and can be accessed from the main land subsidence webpage at this link: More Summary

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