Far Western Section Field Guide for the Sonora Pass Region available at Sunbelt Publishing!

(Cross-posted from Geotripper)
Our field guide to the geology of the Sonora Pass region and the eastern Sierra Nevada region is now available for sale at Sunbelt Publishing for $24.95 (here is the link)! This was the roadguide for our recent meeting of the Far Western Section of the National Association of Geoscience Teachers. There are quite a few geological road guides out there for the eastern Sierra Nevada, especially around the Mono Lake area, but there have been fewer guides for the area to the north. It is a fascinating area, with wide areas of Miocene volcanism, faulting and Pleistocene glaciations (the largest glaciers of the eastern Sierra Nevada traversed the West Walker River gorge).

One of California's most intriguing ghost towns can be found at Bodie (above), and one can also find a strange "fluvial forest" in the West Walker River, a group of long-dead Ponderosa pines that provide evidence of a century-long mega drought only a thousand years ago (below).

The western slope of the Sierra along the Stanislaus River hides some geological treasures as well, including the Columns of the Giants and the Natural Bridges in the cave country north of Columbia State Park (below).

Here is the table of contents...

A Geographical Sketch of the Central Sierra Nevada
A Brief Overview of the Basement Rocks of the Central Sierra Nevada
Trip 1: The Sierra Crest Graben: A Miocene Walker Lane Pull-Apart in the Ancestral
Cascades Arc at Sonora Pass by Cathy Busby, Alice Koerner, Jeanette Hagan, and Graham Andrews at the University of California, Santa Barbara
Trip 2: A Guide to the Geology of the Eastern Sierra Nevada between Sonora Pass
and June Lake, California by Garry Hayes, Modesto Junior College
Trip 3: Geology and Climatology of the Saddlebag Lake Region near
Tioga Pass, CA by Laura and Ryan Hollister
Trip 4: Sword Lake Debris Flow by Jeff Tolhurst, Columbia College
Trip 5: Unique Geology along the Stanislaus River, Western Central Sierra Nevada by Noah Hughes, Modesto Junior College
 Appendix A: The Flora of Central California: Central Valley to the Great Basin by Mary Cook

A reminder: Sales of this guide will fund the scholarship program of the Far Western Section of the NAGT, which supports geology majors throughout California, Nevada and Hawaii. Check it out!

Bizzaro Rocks Day and a Roadrunner: an update from the Fall Meeting of the Far Western Section

(Cross-posted from Geotripper)

We were on the road this weekend, attending the fall meeting of the Far Western Section of the National Association of Geoscience Teachers. When geologist-teachers get together, we may talk about teaching, but we make sure our activities revolve around geology. We explore.

The sponsor of our meeting was Copper Mountain College, which serves the towns of Yucca Valley and Twentynine Palms. The towns are right next to Joshua Tree National Park which sits astride the boundary between the Mojave and Sonoran Deserts in Southern California. One group explored the scarps produced by the 1992 Landers Earthquake, a 7.6 temblor that produced a prominent scarp that is still visible today. The other trip was a tour of a park named for an odd tree, but whose other distinction is the bizarro rocks it has. Joshua Tree is a showcase for plutonic processes, with thousands of acres of weirdly weathered granitic boulders.

This is a brief post before I hit the long road home, but here are a smattering of photos of my favorite outcrops. They include the very colorful lichens I found in sheltered spots. Lichens are an entire ecosystem of lifeforms in miniature, a symbiotic relationship between algae and fungi.

And then there was the Triassic megacrystic Twentynine Palms quartz monzonite. I've seen plenty of porphyritic granitic rocks before, but a canyon filled with giant boulders of this stuff was just extraordinary.

I could swear I heard a little "beep-beep", and there it was, a little roadrunner wondering what we were up to. More pics later!

Don't Take Joshua Tree for Granite: The Fall Meeting of the Far Western Section of the National Association of Geoscience Teachers

There is still time to see one of California's most unique national parks!

(Reposted from October 1: Registration forms and more information available at the Far Western Section website)

Joshua Tree National Park is one of the most unique desert environments to be found anywhere in North America (See a representative journey with Geotripper here). Sitting astride the boundary zone between the Mojave and Sonoran deserts, the park displays a startling variety of plant and animal species, and stunning displays of a Proterozoic metamorphic complex and Mesozoic plutonic rocks. It is a great place to learn about geology.

Copper Mountain College will be the host for the Fall 2011 meeting, which will include explorations of the park, and a journey to the interior of the Mojave to see the scarps from the 1992 Landers earthquake, still starkly obvious after two decades. The magnitude 7.3 quake killed two and produced a fracture that crossed fifty miles of desert.

The Far Western Section of the National Association of Geoscience Teachers invites anyone interested in the geological sciences to join them, including students (especially students!). Membership in NAGT is not required. This is a wonderful opportunity to see a fascinating corner of California's geology, and a chance to meet earth science teachers from all over California and Nevada (Hawaii is in our section too). It is an exciting and economic way to see some of southern California's most incredible geology.

Friday November 11, 2011

6:00 PM Meet at Copper Mountain College Bell Center Community Room for Registration 

(On-site registration cost estimate is $50.)

7:00 PM NAGT Far Western Section Board Meeting

8:00 - 9:00 PM Registration

Saturday November 12, 2011

8:00 - 10:00 AM Meet at the Bell Center Community Room for Registration

10:00 AM – 5:00 PM Field Trips (Choose One)

Field Trip Number 1

Landers Earthquake: Scarps still visible after 20 years plus Pioneer Town: Dating of a Miocene(?) erosional surface – Bob Reynolds

Field Trip Number 2 

Geology of Joshua Tree National Park – Bruce Bridenbecker

Presentation: 6:00 – 9:00 PM Evening Social with Lecture on Mines and Mining in Joshua Tree National Park - Dee Trent

Sunday November 13, 2011

8:00 AM Meet at Bell Center Parking Lot for Field Trip to Desert Queen Mine – Dee Trent

Field Trip should conclude by 2:00 or 3:00 PM.                                           

Logistics:

Joshua Tree Area Services

For a directory of area motels and restaurants visit the Joshua Tree Chamber of Commerce Web Site at http://www.joshuatreechamber.org/.

Joshua Tree Area Camping

Indian Cove is located 13 miles east of Joshua Tree Village and 10 miles west of Twentynine Palms on the north side of the Wonderland of Rocks. Indian Cove Road dead-ends at this secluded area. Campers register at the ranger station located at the entrance to the Indian Cove area. Water is also available there.

Contact Bruce Bridenbecker for additional information.

Reflections on an Accretionary Wedge: Why I am a Proud Member of the NAGT

(cross-posted at Geotripper.blogspot.com)

I recently contributed to the latest Accretionary Wedge by talking about my first geology field trip, a 5 day backpack in the depths of the Grand Canyon way back in 1976. Part of the subsequent fallout was the unearthing of pictures of that trip, courtesy of Joy, who was one of my fellow travelers at the time (Facebook has some positive aspects, actually). I am a visually oriented learner, and my memories are most strongly reinforced by photographs, so this was a real pleasure to be able to relive part of my past with these grainy reminders (weren't Kodak Instamatics a wonderful form of photography?). For instance, I don't remember his name, but the bearded gentleman on the left was a very vocal vegetarian, but during the trip he seemed to get hungrier and hungrier, and when we reached the rim at the end of the five days, he looked at the menu in the Grand Canyon Lodge, and ordered a huge steak...

The professor who led that trip into the canyon was my inspiration to become a teacher of geology. That's him in the picture above, explaining to us how the basaltic sills were able to intrude the sediments of the Grand Canyon Supergroup, and how they helped us to place a date on the formation of those sediments. I still remember the shock of realizing that I really could almost literally travel through time by holding and understanding the origin of rocks that were hundreds of millions years old (imagine seeing the imprint of a raindrop that hit the ground 800 million years ago!). Looking at a picture of Marlin at work, I realize that I can trace many of the ideas I use in teaching to the things that he did all those years ago. Innovative ideas in teaching appear all the time, and they can be very effective, but I am reminded that the geological sciences are among the most historical of the academic disciplines as well. I mean this in the sense that there is an academic lineage that gives us a direct link to the founders of the science of geology, and that those brilliant and perceptive minds continue on with a different form of immortality (I wrote about this for a different Accretionary Wedge two years ago). I think what I am really saying is that people often become geologists and teachers not so much because they planned on it the way kids plan on being firefighters or police officers, but because they were inspired to pursue it because of the dedication of their teachers. I know I am over-generalizing about this, but I just don't see someone pursuing an MBA because he or she was inspired by a particularly good economics teacher, though I am willing to listen to counter-arguments! People have many different motivations for choosing their academic goals, after all.

I am thinking about this because I am preparing to drove down to Fresno to attend the fall meeting of the Far Western Section of the National Association of Geoscience Teachers at CSU Fresno (there is still room if you want to drop everything you are doing and drive on into the center of California and see some excellent Sierra Nevada and Coast Range geology- details are here). I joined NAGT nearly fifteen years ago, and have found in my involvement with the organization a sense of history and tradition of excellent teachers, and a myriad of innovative ideas and approaches to the teaching of the geological sciences. It has been a real privilege to work and share ideas with my colleagues from California, Nevada and Hawaii, as well as from all over the country. It's one thing to be inspired to follow an academic discipline because of the work of one or two excellent teachers, and quite another to travel with a large group of talented and innovative teachers who are collectively inspiring hundreds of students. And for that matter, because we encourage students to attend these meetings, it is great to see how they are laying the groundwork for the future of the earth sciences.
1976...that was 34 years ago. Wow. I still have that orange Alpenlite backpack with the innovative wrap-around aluminum frame (I actually worked in their factory for a few months all those years ago). I tried it on the other day, the way someone might try on the tux they wore to the high school prom. And just like the tux, the aluminum frame must have shrunk. Aluminum can shrink, right? I know I haven't changed and gotten...bigger. The frame obviously has shrunk!

Field Trips at the October 8-10 Fresno Conference of the Far West Section Announced

If you ever wanted to get out and see some of the great geological sites in California, and wished you had a knowledgeable guide and mentor to explain what you are seeing, check out this wonderful opportunity coming up on October 8-10, 2010: The Field Conference of the Far Western Section of the National Association of Geoscience Teachers, sponsored by California State University, Fresno. You don't have to be a teacher or a member to attend, and students of the earth sciences are especially encouraged to join us. Here are some of the field trips that are lined up:

Saturday Field Trips:

Topographic Evolution of the Kings River Canyon: Fluvial, glacial and Hillslope Erosion in Response to Late Cenozoic Uplift and Climate Change (Greg Stock, Park Geologist, Yosemite National Park)

Coeval mafic-felsic magmatism in the intrusive suite of Yosemite Valley (Kent Ratajeski, University of Kentucky)

Emplacement of oceanic lithosphere into the western Sierra Nevada and its welding into continental basement by batholithic emplacement (Jason and Zorka Saleeby, Cal Tech)

Growth and internal evolution of Jurassic and Cretaceous magmatic plumbing systems: an examination of the tilted Jurassic Guadalupe Igneous Complex and comparison to the Cretaceous Tuolumne Batholith (Scott Patterson, USC, and Keith Putirka, CSU Fresno)

Southern Diablo Range geology: Recorder of past subduction and current active tectonics (John Wakabayashi, CSU Fresno)

Sunday Field Trips:

Anomalous subsidence and uplift along the southwestern Sierra Nevada in relation to underlying mantle dynamics (Jason and Zorka Saleeby, Cal Tech)

Ice Age (Middle Pleistocene) Fossils at the Fairmead Landfill, a Visit to the Madera County Fossil Discovery Center (Bob Dundas, CSU Fresno)

Geology and Natural History of the McKenzie Table Mountain Preserve (Craig Poole, Fresno City College, and Chris Pluhar, CSU Fresno)

Friday and Saturday Trip:

The San Andreas fault in Central California (Ramon Arrowsmith, Arizona State University)

Presenters:

Friday Evening:

Chris Pluhar (CSU Fresno), Table Mountains and Tectonics, What Canyon-Filling Lavas of the sierra Nevada Reveal About Miocene California

Saturday Evening:

Jason Saleeby (Cal Tech), Sierra Nevada Geology from the 225 km Mantle Seismic Discontinuity to Mt. Whitney Summit Elevations

Check out the Far West Section NAGT Website, or contact Paul Troop for more details (registration information will be posted soon). Meetings of the Far West Section are economical ways to see a lot of California, Nevada and Hawai, usually less than $150, and lodging in the Fresno area is economical. Our invitation extends to anyone who is interested in learning more about California geology. These conferences are wonderful ways to get familiar with the geology of a fascinating region, the western coast of the United States.

(cross-posted at Geotripper.blogspot.com)

Far Western Section NAGT-CalESTA Joint Conference, Bishop California

A few pictures from our recent field conference in Bishop, California:
Convict Lake is dammed by a recessional moraine of the Tioga glaciation in the eastern Sierra Nevada. The mountain in the distance is composed of marble and slate of Paleozoic age; they are the rocks that existed prior to the intrusion of the Sierra Nevada batholith in Mesozoic time.

Mono Lake is a remnant of the ice age pluvial lakes that once extended across much of the Basin and Range Province. It was once a freshwater lake hundreds of feet deep, but today is saltier than seawater. It hosts only two life forms, fairy shrimp and brine flies, but these two species support several million migratory birds which pass through the region every year.

Violet-green Swallows live and nest in the tufa towers that are found around the lake. The tufa towers (below) are composed of calcium carbonate (calcite), and form where freshwater springs flowed into the lake. They were exposed as the lake level dropped 50 feet when Los Angeles started diverting streams that once replenished the lake in 1941. The diversions threatened to destroy the complex ecosystem, which is international in scope (some of the migratory birds travel 15,000 miles). Efforts are now ongoing to raise lake level to about where it was in 1963, roughly midway between the 1941 level and the low point in the 1980's.

More pictures can be accessed here. Do you have pictures of the trip? Send them along, and I'll post them!

Thanks to Wendy Van Nordon, Mark Boryta, and everyone who helped organize a great trip!

Dispatches from the Road: Far Western Section Conference in Bishop, California

A few preliminary views from the road at the joint NAGT/CalESTA field conference at Bishop California. One of our stops: the Mono Lake Tufa Towers. The tufa is made of calcium carbonate, and forms near freshwater springs in the intensely salty and alkaline lake.

The lake supports brine shrimp and brine flies which in turn provide sustenance for millions of migrating birds. The lake has been threatened by water diversions that caused to shrink to a shadow of its former size, but lawsuits and legal agreements are stabilizing lake levels.

The lake formed in a volcanic-tectonic depression, and active volcanoes are found in and near the lakeshore. The white island in the distance is formed by uplift of the lake sediments by volcanic intrusions.