Geologic History
The Tularosa Basin was developed in the north-south trending San Andres Mountains, and comprises north-south striking Late Paleozoic sedimentary rocks of Permian and Carboniferous age, that lie unconformably upon Precambrian metamorphics. The regional dip of the Paleozoic rocks is gentle, around 10° to the west. The Permian rocks of the Abo and Yeso formations comprise mudrocks and sandstones which are freely weathering to create a series of steps capped by sandstones with intervening argillaceous rocks forming less steep slopes. These slopes and cap rocks were to be used to advantage by the Apaches in 1880. The entrance to the Hembrillo Basin, Hembrillo Canyon, opens eastwards into the Tularosa Basin and the White Sands National Monument. The Canyon is partially barred by a roughly north-south trending diabase dike. Westwards is the valley of the Jornada del Muerto, the Sierra Caballo mountains and the Rio Grande.
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