Glass Mountains

The Glass Mountains stretch west along U.S. Route 412 from Orienta south of the Cimarron River.

[b] During the Quaternary Period, the most recent one million years, Pleistocene terraces were laid down along the major rivers in this area of the United States, with Holocene alluvium that are at least 100 feet (30 m) thick and contain sand, gravel, silt, clay and volcanic ash.

In 1891, botanist George Walter Stevens, started collecting specimens in the Glass Mountains domain for his dissertation.

The University of Oklahoma Bebb Herbarium holds 4,500 samples that Stevens collected statewide.

Two cacti he may have collected in the Glass Mountains area are Echinocereus caespitosus and Opuntia phaecantha.