Abstract
The Animas Mountains are a north-south-trending range in south-central Hidalgo County, New Mexico. Previous publication on the geology of the northern Animas Mountains includes a reconnaissance map by Zeller and more detailed geologic mapping by Soule. Nearly 1000 m of Paleozoic marine and several thousand meters of Cretaceous clastic sedimentary rocks are exposed in the northern Animas Mountains. Intrusive rocks include Precambrian granite; Laramide stocks, dikes, and sills of quartz monzonite and quartz latite; and post-Laramide dikes of rhyolite and small vitrophyre intrusions. Previous structural interpretations of the northern Animas Mountains involved large-scale overthrusting and included this area in the Cordilleran overthrust belt. The authors believe the previous work misidentified parts of the Bliss (Precambrian), Mojado (Lower Cretaceous), and Ringbone (Upper Cretaceous-lower Tertiary) formations. They also suggest an alternative relationship of the Ringbone formation (Upper Cretaceous-lower Tertiary) to Laramide structures in several southwestern New Mexico mountain ranges previously included in the Cordilleran overthrust belt. This study includes a detailed analysis of the stratigraphy and structure, which also suggests an alternative model.
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