page_title: Brazos Mountains
section_title: Geology
hierarchical_section_title: Brazos Mountains / Geology
caption_attribution_description: English: The Brazos Cliffs in northern New Mexico, looking east across Heron Lake.
context_page_description: The Brazos Mountains is a range in far northern Rio Arriba County, in northern New Mexico in the southwestern United States. The range is part of the Tusas Mountains – the southern portion of the San Juan Mountains which are more well known in Colorado. A high crest runs from the border with Colorado for over 20 miles in a south-southeasterly direction. The high point of the range at 11,405 feet is on Grouse Mesa,
  at the Brazos Benchmark.
  Two miles to the southeast is the more distinctive Brazos Peak, at 11,288 feet.
  The range is mostly located in the privately held Tierra Amarilla Land Grant. It is a distinctive part of the view from the west, including from Heron Lake. U.S. Route 64 crosses the southern end of the range at a 10,481 foot pass. This is the highest paved through road pass in New Mexico. Nearby are the photogenic Brazos Cliffs, headwaters of the Rio Brazos and part of the Rio Chama river system. These mountains overlook the Chama River, the largest tributary of the Rio Grande which lies to the east. In essence, these mountains are the southern extension of the South San Juan Range that lies in Colorado.
context_section_description: The Brazos Mountains are the southwestern remnants of a Laramide peneplain resulting from the erosion of mountains formed 80 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.
caption: The Brazos Cliffs, looking east at sunset across Heron Lake.
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