New Mexico Geological Society
Fall Field Conference Guidebook – 69
Las Cruces Country III


Greg H. Mack, Brian A. Hampton, Frank C. Ramos, James C. Witcher, and Dana S. Ulmer-Scholle, [editors]
2018, 218 pages.

After a 20-year hiatus, the 2018 NMGS Fall Field Conference will showcase the geology of south-central New Mexico with emphasis on the Doña Ana Mountains and surrounding regions near Las Cruces. The Las Cruces area is situated in the northern part of the Chihuahua Desert and is noted for a wide variety of geologic and geomorphic features as well as the recently-designated Prehistoric Trackways National Monument (2009) and Organ Mountains-Desert Peaks National Monument (2014). New data and topics discussed in this guidebook include regional geologic structure and tectonics, stratigraphy and paleontology, hydrogeology, petrology and geochemistry, volcanology, economic geology and mineral resources, mining history, as well as a wealth of new igneous and detrital geochronologic and thermochronologic ages from Precambrian- Cenozoic rocks. This volume includes detailed road logs of the Las Cruces region as well as four mini-papers and sixteen peer-reviewed technical research papers.

There are two versions of this guidebook available, the complete guidebook (218 pages), and a version with just the road logs that is spiral bound (68 pages).

ISBN: 1-58546-108-3
Softcover: $65.00 Buy Now

ISBN: 1-58546-109-1
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.

Roadlogs: (each includes listed mini-papers)

The Doña Ana Caldera and regional outflow sheets: First-day Road Log from Las Cruces to Southern Doña Ana Mountains and Point of Rocks
— G.H. Mack, F.C. Ramos, B.A. Hampton, W.R. Seager, and J.C. Witcher, pp. 1-13.
Geologic evolution of southern New Mexico: Second-day road log from Las Cruces to the northwestern Doña Ana Mountains and west-central Robledo Mountain
— G.H. Mack, F.C. Ramos, B.A. Hampton, W.R. Seager, and J.C. Witcher, pp. 15-29.
Cenozoic igneous activity in the Organ Mountains: Third–day (A) road log from Las Cruces to Dripping Springs Recreation Area, Organ Mountains
— F.C. Ramos, B.A. Hampton, W.R. Seager, and G.H Mack, pp. 31-37.
Authigenic opal and calcite beds in axial-fluvial sediment of the Camp Rice Formation (Pliocene-lower Pleistocene), Rincon Hills: Third–day (B) Road Log from Las Cruces to Rincon Hills
— G.H. Mack, pp. 39-45.
Masson Farm Geothermal Greenhouses at Radium Springs: Third–day (C) Road Log from Las Cruces to Geothermal Greenhouses of the Masson Farm at Radium Springs
— J.C. Witcher and G.H. Mack, pp. 47-51.


A new stegomastodon skull (Proboscidea: Gomphotheriidai) from the Camp Rice Formation, Doña Ana County, New Mexico
— P. Houde and D. Peltier, pp. 53-56.
Summary of landforms of the central Jornada del Muerto that influence the hydrology and path of El Camino Real de Tierra Adentro
— D. Kludt, D. Love, T. Newton, and B. Allen, pp. 57-59.
Digital 3D geologic framework of the Las Cruces area
— D. S. Sweetkind, pp. 60-62.
Levees of the Hatch and Mesilla Valleys
— A. Glover, pp. 63-64.


Sr and Pb isotope variations of igneous feldspars in the Doña Ana mountains (1.43 MB PDF)
— F.C. Ramos, T. Askin, S. Levesque, P. Stevens, J. Thines, S. Farnsworth-Pinkerton, S. Lindell, and N. Richard, pp. 173-179. [ABSTRACT]
The Aden lava flows, Doña Ana County, New Mexico (2.85 MB PDF)
— R.A. DeHon and R.A. Earl, pp. 197-202. [ABSTRACT]
Characterization and origin of episyenites in the southern Caballo Mountains, Sierra County, NM (2.83 MB PDF)
— V.T. McLemore, A. Smith, A.M. Riggins, Dunbar N., K.B. Frempong, and M.T. Heizler, pp. 207-216. [ABSTRACT] Supplemental Data:

Recommended Guidebook Citation:

  1. Mack, Greg H.; Hampton, Brian A.; Ramos, Frank C.; Witcher, James C.; Ulmer-Scholle, Dana S., 2018, Las Cruces Country III, New Mexico Geological Society, Guidebook, 69th Annual Field Conference, 218 pp. ISBN: 1-58546-108-3