2022 Map of Gilliland Peak

About this map

The Glass Mountains dominate the northern landscape of this Brewster County region, showcasing the distinctive limestone peaks and steep escarpments characteristic of the Trans-Pecos. This topographic study captures the area's high-desert drainage patterns, where Moose Draw and Road Canyon cut through the elevated terrain before giving way to the lower basin. To the south, isolated peaks like Cathedral Mtn and Iron Mtn stand as prominent landmarks, reflecting the complex volcanic and tectonic history of the Marathon Uplift area. The intermittent waters of Peña Colorado Cr meander through the eastern sector, illustrating the vital role of seasonal watercourses in an environment defined by its arid climate and sparse settlement. This modern U.S. Geological Survey representation provides a precise view of the ranching lands and geological formations that have dictated movement and land use in this part of West Texas for generations.