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 yearly offerings include the A Simple Christmas celebration, Prairie Heritage Days, and the July 4th Bike Parade. The Park also hosts a variety of activities put on in conjunction with other entities, including the Christmas Bird Count and the Butterfly count, undertaken as part of the Audubon Society and North American Butterfly Association's national efforts, respectively. Brazos Bend State Park's Christmas Bird Count effort is routinely in the top 3-4% of the over 2000 Counts taking place in North America. The park is also home to the George Observatory (code: ), a satellite facility of the Houston Museum of Natural