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 Bend State Park river otter. The most noteworthy and popular residents of the park are the relatively large population of American alligators. The park is open year-round, with the exception of several weekends a year during which it is closed for controlled hunts to manage the white-tailed deer population. Brazos Bend State Park occupies land bordering the Brazos River and includes within its boundaries low-lying areas left over from the River's previous meanderings. Pre-Columbian inhabitants included a series of Native American groups, most notably the Karankawa. The land passed through a variety of landowners' hands, resulting in some of the existing structures on