Lineament analysis was used to study the relationship between subsurface structure and surficial features in East Texas, southeastern Oklahoma, southwestern Arkansas, and northwestern Louisiana-areas of low topographic relief, moderate vegetation cover, and diverse land use. More than 2,200 lineaments were mapped from four standard 1:250,000-scale Landsat Thematic Mapper images. Operator error and data-base variation were evaluated in areas of sidelap between adjacent images.

Since 1978, six climate- and erosion-monitoring stations on slopes in draws and large playa lake basins in the interior of the Southern High Plains and slopes along the Caprock Escarpment in the Rolling Plains of the Texas Panhandle have recorded precipitation amount and intensity, air and soil temperature, soil electrical resistance (soil moisture), slope erosion and deposition, and slope and stream headcut retreat. Stations are located in areas of active erosion.

San Andres and Grayburg reservoirs have yielded about 42 percent (9.8 billion barrels) of the total cumulative production of oil from the Permian Basin of West Texas. However, recovery efficiencies have been low, and significant quantities of mobile oil remain after primary and conventional secondary recovery. Major San Andres and Grayburg reservoirs, each of which has produced more than 10 million barrels, are estimated to contain 8.7 billion barrels of unrecovered mobile oil.

Data from five drainage basins in the Texas Panhandle and northeastern New Mexico characterize the recent history of regional drainage basin formation and landscape development around the margins of the Southern High Plains. Because stream flow records for most streams in the area are only available for the last 15 yr, morphometric (shape) measurements are used to obtain a long-term, basinwide view of the geomorphic history of these watersheds.