Brazos Mountains to 55 million years ago during the Laramide orogeny. To the east and northeast lie the Sangre de Cristo Mountains which share a similar geological history. The Brazos Cliffs, which form a dramatic backdrop to Tierra Amarilla, are formed of Precambrian quartzite. Brazos Mountains The Brazos Mountains is a range in far northern Rio Arriba County, in northern New Mexico in the southwestern United States. A high crest runs from the border with Colorado for over in a south-southeasterly direction. The high point of the range at is on Grouse Mesa, at the Brazos Benchmark. Two miles (3 km) to
Brazos Valley Brazos Valley The Brazos Valley ( ) is a region in the U.S. state of Texas (a subsection of the larger Central Texas region) consisting of the counties of Brazos, Burleson, and Robertson (which collectively comprise the Bryan–College Station metropolitan area), and the neighboring counties of Grimes, Leon, Madison, and Washington. The area is centered on Brazos County, the cities of College Station and Bryan, and Texas A&M University. Although the Brazos River lies at the center of the region, not all areas of the region are a part of the Brazos watershed. The population of the region was estimated