Mogollon-Datil volcanic field
The Mogollon-Datil volcanic field is a large silicic volcanic field in western New Mexico. It is a part of an extensive Eocene to Oligocene volcanic event which includes the San Juan volcanic field in southwestern Colorado, the Trans-Pecos volcanic field in west Texas and north central Mexico, the Boot Heel volcanic field in the bootheel of southwestern New Mexico and adjacent areas of Arizona and Mexico; and the vast volcanic field of the Sierra Madre Occidental of western Mexico. The Mogollon-Datil volcanic field was formed in "four discrete pulses representing synchronized activity of two separate cauldron complexes".
The Socorro, New Mexico region of the central Rio Grande rift hosts an inflating mid-crustal sill-like magma body at a depth of 19 km that is responsible for anomalously high earthquake activity in the vicinity. Earth and space-based geodetic measurements indicate ongoing surface uplift above the at approximately 2 mm/year.
Formations
The Datil Group, or series of volcanic and related formations in New Mexico and eastern Arizona represents the extrusive output from the Mogollon-Datil volcanic field. Originally the Baca Formation was included in the group, but now the group is considered to start with the Spears Formation. The base of the group, as originally defined, rests unconformably on the Mesaverde Formation, and the series is succeeded by the Popotosa Formation of the Santa Fe Group. The series consists of the following formations:- Baca Formation, primarily fluvial red shales and sandstones of the Eocene, no longer considered part of the group;
- Spears Formation, latitic to andesitic conglomerates, mudflow deposits and thin, interbedded volcanic clastics and sandstones, followed by andesite flows interbedded with some conglomerates and mudflow deposits, approximately 37 Ma;
- Hells Mesa Tuff, over 2000 ft thick consisting of ash layers that erupted about 32.1 Ma, rhyolitic tuff with interbedded mudflow deposits and basalts;
- A-L Peak Tuff
- La Jara'Peak Basaltic Andesite
Notable Calderas
Northern complex
Socorro-Magdalena caldera clusterLocation: West of Socorro, South of Magdalena, and Southeast of Datil.
| Name | Elevation | Coordinates | Age |
| Socorro Caldera | – | 32 Ma | |
| Sawmill Canyon Caldera | – | 28.7 Ma | |
| Hardy Ridge Caldera | – | 28 Ma | |
| Mount Withington Caldera | – | 27.4 Ma | |
| Bear Trap Caldera | – | 24.3 Ma |
Southern complex
Located from Las Cruces to Mogollon:| Name | Elevation | Coordinates | Age |
| Nogal Caldera | – | 28.4 Ma | |
| Organ Caldera | – | 32 Ma | |
| Emory Caldera | – | 33 Ma | |
| Twin Sisters Caldera | – | 31.4 Ma | |
| Schoolhouse Mountain Caldera | – | 33.5 Ma | |
| Mogollon Caldera | – | 34.0 Ma | |
| Bursum Caldera | – | 28.0 Ma | |
| Gila Cliff Dwellings Caldera | – | 28.1 Ma |
Note: the ages given in Chapin et al. and Ward do not match sometimes.