| |
| | Glass Mountains, Texas |
 | | The border of the Delaware Basin is marked by the Capitan Reef, an ancient coral reef in Texas and New Mexico; one of the areas where it protrudes is the Glass Mountains, on the southern boundary of the Delaware Basin. |
 | | The Delaware Basin includes an estimated billion years of geological record, but the Permian portion is of especial interest because of its presence in the area; some 95% of the outcrops are of Permian origin. |
 | | The layers of the Permian in the area, as first proposed in 1939, are the Wolfcampian, the Leonardian, the Guadalupian, and the Ochoan, named for various local features (the first two are named for Wolf Camp, a town in the Glass Mountains, and Leonard Mountain, also in that mountain range). |
| www.ucmp.berkeley.edu /permian/glassmts.html (1401 words) |
|