A map (scale 1:500,000) shows the linear features determined from Landsat imagery in the Texas and Oklahoma panhandles. The linear features, sometimes called linear trends or lineaments, are not identified as to type or origin. Most probably represent fractures or fracture zones, which may affect the movement of water or other fluids through rocks. The linear features are classified as to length--less than 30 mi/mg and more than 30 mi/mg. (USGS)