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 other sections for recent guidebooks are only available in print.

Roadlogs: (each includes listed mini-papers)


Introduction (382 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
— Beverly B. Bradish and N. K. Mills, pp. 48.
Geologic history of the San Juan Basin area, New Mexico and Colorado (584 KB PDF)
— Edward C. Beaumont and Charles B. Read, pp. 49-54.
Pre-Cambrian rocks of the San Juan Basin (344 KB PDF)
— Vincent C. Kelley, pp. 53-55.
Pennsylvanian rocks of the San Juan Basin (414 KB PDF)
— Beverly B. Bradish and N. K. Mills, pp. 58-61.
Triassic rocks of northwestern New Mexico and southwestern Colorado (838 KB PDF)
— Sherman A. Wengerd, pp. 67-75.
Jurassic formations of parts of Utah, Colorado and New Mexico (593 KB PDF)
— William B. Hoover, pp. 76-81.
Cretaceous rocks of the San Juan Basin area (347 KB PDF)
— Paul H. Umbach, pp. 82-84.
Lower Tertiary formations and vertebrate faunas of the San Juan Basin (585 KB PDF)
— George G. Simpson, pp. 85-89.
Regional structure of the San Juan Basin (1.01 MB PDF)
— Vincent C. Kelley, pp. 101-108.
Coal resources of New Mexico (729 KB PDF)
— Charles B. Read, R. T. Duffner, Gordon H. Wood, and A. D. Zapp, pp. 124-131.
Geophysical exploration in the San Juan Basin (248 KB PDF)
— D. Ray Dobyns, pp. 132.
Drilling practices in the San Juan basin (297 KB PDF)
— O. J. Lilly, pp. 133-134.
Marketing of oil and gas from the San Juan Basin (813 KB PDF)
— Van Thompson, pp. 135-143.
Oil conservation in New Mexico (351 KB PDF)
— R. R. Spurrier, pp. 152-153.
Geologic map of the San Juan Basin
— Caswell Silver, pp. 156.

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.