All Blogs / Academics / Geology / Popular

Geology of the Biff’s site

Because I walk through the area regularly, I’ve kept an envious eye on the excavation at the southeast corner of 27th Street and Broadway. Since the building slated for the site doesn’t have a name yet, I’ll call it the Biff’s site after the much-loved but long-departed Biff’s Coffee Shop that once sat there. It’s […]

The Most Desolate Place in the United States? The Mauna Loa Weather Observatory

4 months agoAcademics / Geology : Geotripper

If I seem to be missing in action, it would be because I've been stuck on planes and in airports on my way to the conference and field trips of the Cordilleran Section of the Geological Society of America. Just my luck that they happen to be meeting in Hawai'i this year. Show More Summary

Revisiting the 2006 debris flow of Santa Catalina Mountains

Bouldery debris flow levee, Santa Catalina Mtns. Historic rainfall precipitates 100s of debris flows | For five days in late July 2006, the mountains of southern Arizona received unusually heavy rainfall. A final burst of precipitation on the morning of 31 July produced over 400 hillslope failures in the Santa Catalina Mountains of Pima County (Fig. Show More Summary

Sea level as a metronome of Earth’s history

Sedimentary layers record the history of the Earth. They contain stratigraphic cycles and patterns that precisely reveal the succession of climatic and tectonic conditions that have occurred over millennia, thereby enhancing our ability to understand and predict the evolution of our planet.

37 Years Ago, America's Relationship with Volcanoes Changed Forever

The Mount Saint Helens eruptions was a scientific boon -- Read more on

The Unsung Waterfalls of Yosemite Valley

4 months agoAcademics / Geology : Geotripper

One takes their chance when deciding to visit Yosemite Valley in the springtime. The storms of winter are never quite done by then, and you may find yourself in a valley full of clouds. That's where I found myself a week back, touring the Yosemite region with my students. Show More Summary

Zn-Pb-Ag Mining Prospect in Patagonia Mtns, AZ: Ramping up!

Drilling at Taylor Deep. (Courtesy of Arizona Mining) According to a story in the Northern Miner, Arizona Mining is planning for substantial Zn production, ~ 9,100 tonnes ore/day, as early as 2020. Pending permitting. The Taylor Deep...Show More Summary

High Water Across the West: Honey Lake

I've recently had the opportunity to travel across part of the Great Basin of eastern California and northern and central Nevada, and have noticed a lot of high water, almost everywhere. Honey Lake, which has been dry to only partly filled during the last several years, is once again a lake. Show More Summary

The Dimond Canyon water gap

In a city full of geologic features, Dimond Canyon stands out as a classic example of a water gap. But it can be hard to see, even from the prime viewpoint of Leimert Bridge. Let’s abstract ourselves by studying the overhead views shown in maps. Google Maps, with the terrain view turned on, is where […]

Update: Arizona Reservoir Volume Status Spring 2017

As we head into summer here is a quick look at the state of Arizona's reservoirs at the end of February 2017. It was a good winter for recharge and the smaller reservoirs are faring well. Not so much, the Colorado River's Lake Mead and Powell. Reservoir data courtesy of CLIMAS - Climate Assessment for the Southwest. Posted 5/15/2017

Trump Exe. Order could impact four AZ National Monuments

On 26 April 2017, President Trump signed an executive order requiring the Department of the Interior to review national monuments comprising more than 100,000 acres and created since 1996. This review involves 20 national monuments. Physiographic features of Vermilion Cliffs Natl. Show More Summary

Warming and increased aridity during the earliest Triassic in the Karoo Basin, South Africa

The Permian-Triassic (P-T) mass extinction is the largest extinction event of the Phanerozoic and has been causally related to eruption of the Siberian Traps (Siberia, Russia) through climatic and ecological effects of volcanically forced greenhouse gas emissions. Show More Summary

The rise and fall of stromatolites in shallow marine environments

Stromatolites are abundant in shallow marine sediments deposited before the evolution of animals, but in the modern ocean they are restricted to locations where the activity of animals is limited. Overall decline in the abundance ofShow More Summary

A 65 k.y. time series from sediment-hosted glasses reveals rapid transitions in ocean ridge magmas

Studies of ocean ridge magmatism have been hampered by the difficulty in constructing time-series data over more than a few thousand years. Sediment rapidly covers newly formed ocean crust, and older rocks, even when recovered from fault scarps, cannot be dated accurately. Show More Summary

Synconvergent exhumation of metamorphic core complexes in the northern North American Cordillera

Continental metamorphic core complexes of the northern North American Cordillera were exhumed during the early Paleogene while the Farallon–North American plate convergence rate remained high. Such convergent boundary conditions canShow More Summary

The fate of sediment, wood, and organic carbon eroded during an extreme flood, Colorado Front Range, USA

Identifying and quantifying the dominant processes of erosion and tracking the fate of sediment, wood, and carbon eroded during floods is important for understanding channel response to floods, downstream sediment and carbon loading, and the influence of extreme events on landscapes and the terrestrial carbon cycle. Show More Summary

Glendonites track methane seepage in Mesozoic polar seas

During the Phanerozoic, Earth has experienced a number of transient global warming events associated with major carbon cycle perturbations. Paradoxically, many of these extreme greenhouse episodes are preceded or followed by cold climate, perhaps even glacial conditions, as inferred from the occurrence of glendonites in high latitudes. Show More Summary

A common origin of carbonatite magmas

The more than 500 fossil Ca-carbonatite occurrences on Earth are at odds with the only active East African Rift carbonatite volcano, Oldoinyo Lengai (Tanzania), which produces Na-carbonatite magmas. The volcano’s recent major explosive...Show More Summary

Copyright © 2015 Regator, LLC