New Mexico Geological Society
Fall Field Conference Guidebook – 61
Geology of the Four Corners Country


James E. Fassett, Kate E. Zeigler, and Virgil Lueth, [editors], 2010, 246 pages.

The 2010 NMGS Fall Field Conference traveled through the Four Corners area in northwestern New Mexico. Day 1 circled the Four Corners Monument with stops in southeastern Utah, northwestern New Mexico and southwestern Colorado. Day 2 began in Cortez, CO and ended in Farmington and Day 3 began in Farmington and ended on the Ojo Alamo Sandstone south of Carson. Highlights of this conference and guidebook were discussions of Mesozoic stratigraphy, energy and resources from the San Juan Basin and southwestern Colorado and the use of geochronologic methods for refining our understanding of local strata and their fauna and flora.

Best Guidebook Award, 2011Geoscience Information Society

There are two versions of this guidebook available — the complete guidebook (246 pages), and a version with just the road logs that is spiral bound (98 pages).

ISBN: 9781585460960
Softcover: $25.00 Buy Now

Softcover: $19.95 Buy Now
Contains road logs and mini-papers only, spiral bound.

Table of Contents:

Note —Downloads of the papers below are free. Road logs, mini-papers, and some other sections of recent guidebooks are only available in print.

Front Matter: (includes Dedication, President's Message, & Conference Organizer's Message)

Download (2.78 MB PDF)

Roadlogs: (each includes listed mini-papers)

Jurassic rocks of the Four Corners region - First day road log
— Christine E. Turner and Fred Peterson, pp. 1-34.


Brushy Basin Member - Lake T'oo'dichi'
— Christine E. Turner, pp. 23-24.
Morrison fluvial stratigraphy
— Fred Peterson and Christine E. Turner, pp. 25.
Junction Creek - Salt Wash intertonguing
— Fred Peterson and Christine E. Turner, pp. 25-26.
Battle Rock Charter School - Salt Wash onlaps Junction Creek
— Christine E. Turner and Fred Peterson, pp. 26-27.
Recapture Member, Aneth area
— Christine E. Turner and Fred Peterson, pp. 28-29.
Recapture Creek: Bluff - Recapture intertonguing
— Fred Peterson and Christine E. Turner, pp. 29-30.
Bluff Gravel Pit and the J-5 unconformity
— Fred Peterson, pp. 30-31.
Montezuma Creek: Brushy Basin Member and Lake T'oo'dichi'
— Christine E. Turner, pp. 31-32.
The Middle Jurassic J-2 unconformity
— R. B. O'Sullivan, pp. 32-33.
Manhunt case closed
— Hal Mansfield, pp. 33-34.
Cretaceous rocks of the San Juan Basin and mineralization in La Plata mountains: Second-day road log from Cortez to La Plata and Durango, Colorado, to Aztec and Farmington, New Mexico
— James E. Fassett, Mary L. Gillam, David Gonzalez, and Kimberlee Miskell-Gerhardt, pp. 35-53.


The Pictured Cliffs at Waterflow, New Mexico
— Lorna Gail LaDage, pp. 49-53.
Geology of the southern San Juan Basin - Third day road log from Farmington south to the Bisti Badlands and east to Barrel Spring locality
— James E. Fassett, pp. 55-68.


The San Juan River dinosaur -bone site
— James E. Fassett, pp. 62-65.
Uranium-vanadium deposits in the Salt Wash Member, Morrison Formation, King Tutt Mesa Area, San Juan County, New Mexico
— Virginia T. McLemore and William L. Chenoweth, pp. 65-68.


New insight into the timing and history of diatreme-dike complexes of the northeastern Navajo volcanic fiedl, southwestern Colorado (3.43 MB PDF)
— D. A. Gonzales, B. E. Turner, R. T. Burgess, C. C. Holnback, and M. R. Critchley, pp. 163-172. [ABSTRACT]
Uranium in the Sanostee district, San Juan County, New Mexico (1.36 MB PDF)
— William L. Chenoweth and Virginia T. McLemore, pp. 213-220. [ABSTRACT]
Gemstone deposits of the Four Corners region, USA (3.53 MB PDF)
— Robert W. Eveleth and Virgil W. Lueth, pp. 221-229. [ABSTRACT]

Recommended Guidebook Citation:

  1. Fassett, James E.; Zeigler, Kate E.; Lueth, Virgil W., [eds.], 2010, Geology of the Four Corners Country, New Mexico Geological Society, Guidebook, 61st Annual Field Conference, 246 pp. ISBN: 9781585460960