New Mexico Geological Society
Fall Field Conference Guidebook - 1
San Juan Basin, New Mexico and Colorado


Vincent C. Kelley, Edward C. Beaumont and Caswell Silver, eds, 1950, 152 pages. (Reprinted 1996)

The San Juan Basin is located mostly in northwestern New Mexico where it embraces all of San Juan County, and parts of McKinley, Rio Arriba, Sandoval, Valencia, and Bernalillo counties. Most of the north rim of the basin is in Colorado where it occupies parts of Archuleta, La Plata, Montezuma, Hinsdale and Mineral counties. A narrow part of the west rim extends into Apache County, Arizona. The area of San Juan Basin is irregularly circular and includes 15-20 thousand square miles. On the first day we will examine a portion of the Rio Grande Valley, the Sierra Nacimiento, the San Juan Basin, the Chama Basin, and the Archuleta anticlinorium to view a great diverstiy of geologic features. The second day will address problems of Cretaceous stratigraphy along the north side of the San Juan Basion and review the structure of the basin rim. The third day will view the stratigraphy and structure between Durango, Colorado and Molas Lake, high in the San Juan Mountains.

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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 (781 KB PDF)

Roadlogs: (each includes listed mini-papers)


Introduction (402 KB PDF)
— Vincent C. Kelley, pp. 9-11.
Road log, first day (Albuquerque to Cuba to Chama)
— Harley Barnes, E. C. Beaumont, V. C. Kelley, C. B. Read, and A. D. Zapp, pp. 12-28.
Second day (Part I:Pagosa Springs northwards along the San Juan River Valley; Part II Pagosa Springs to Durango)
— Harley Barnes, J. L. Borden, Philip T. Hayes, V. C. Kelley, Caswell Silver, Gordon H. Wood, and A. D. Zapp, pp. 29-39.
Third day (Durango to Molas Lake)
— N. Wood Bass, J. L. Borden, and A. D. Zapp, pp. 40-47.
Generalized nomenclature chart (256 KB PDF)
— Beverly B. Bradish and N. K. Mills, pp. 48.
Geologic history of the San Juan Basin area, New Mexico and Colorado (604 KB PDF)
— Edward C. Beaumont and Charles B. Read, pp. 49-54.
Pre-Cambrian rocks of the San Juan Basin (365 KB PDF)
— Vincent C. Kelley, pp. 53-55.
Pennsylvanian rocks of the San Juan Basin (436 KB PDF)
— Beverly B. Bradish and N. K. Mills, pp. 58-61.
Regional structure of the San Juan Basin (1.02 MB PDF)
— Vincent C. Kelley, pp. 101-108.
Coal resources of New Mexico (753 KB PDF)
— Charles B. Read, R. T. Duffner, Gordon H. Wood, and A. D. Zapp, pp. 124-131.
Lands of the San Juan Basin (441 KB PDF)
— A.L. Duff Jr. and J. V. Fritts, pp. 149-151.
Oil conservation in New Mexico (372 KB PDF)
— R. R. Spurrier, pp. 152-153.
Geologic map of the San Juan Basin (1.42 MB PDF)
— Caswell Silver, scale 1:633,600.

Recommended Guidebook Citation:

  1. Kelley, V. C.; Beaumont, E. C.; Silver, C.; [eds.], 1950, San Juan Basin (New Mexico and Colorado), New Mexico Geological Society, Guidebook, 1st Annual Field Conference, 152 pp.