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
Madder Cliffs colony of about 22,000 pairs of Adélie penguins which nest on exposed knolls and ridges above the beach. Other birds nesting at the site in smaller numbers include gentoo penguins, kelp gulls and snowy sheathbills. Madder Cliffs The Madder Cliffs are reddish rock cliffs which form the north side of the entrance to Suspiros Bay, at the west end of Joinville Island, Antarctica. They rise steeply from the sea to about . The cliffs were surveyed by the Falkland Islands Dependencies Survey in 1953–54. The name, given in 1956 by the UK Antarctic Place-Names Committee, is descriptive of the red