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 County, Texas Houston. Brazos County is a Republican stronghold, with no Democrat carrying the county since Texas native Lyndon Johnson in his 1964 landslide. Brazos County, Texas Brazos County ( ) is a county located in the U.S. state of Texas. As of the 2010 census, its population was 194,851. The county seat is Bryan. Along with Brazoria County, the county is named for the Brazos River, which forms its western border. The county was formed in 1841 and organized in 1843. Brazos County is part of the Bryan-College Station, Texas Metropolitan Statistical Area, which consists of Bryan, College Station, and smaller