. Bulletin of the Geological Society of America. Geology. 68 C. R. KEYES INTEEMONT PLAINS OF THE ARID REGION Fe. Deep stream-erosion across the valley and many wells indicate clearl)' the character and thin cover of the rock-floor. Although the surface of these plains is very smooth and is apparently everywhere covered by mountain wash, the thiclcness of the soft mantle is rarely over 100 feet. The indurated rocks which form the foundation of the plains are often inclined at high angles and are evenly beveled. A typical cross-section is shown near the Hagan coal camp (Una de Gato),. , Figure 2
. Bulletin of the Geological Society of America. Geology. 68 C. R. KEYES INTEEMONT PLAINS OF THE ARID REGION Fe. Deep stream-erosion across the valley and many wells indicate clearl)' the character and thin cover of the rock-floor. Although the surface of these plains is very smooth and is apparently everywhere covered by mountain wash, the thiclcness of the soft mantle is rarely over 100 feet. The indurated rocks which form the foundation of the plains are often inclined at high angles and are evenly beveled. A typical cross-section is shown near the Hagan coal camp (Una de Gato),. , Figure 2.—Beveled Plains—Surface of Cretacic Sandstones on the east side of the Sandia range, and is represented below (figure 2). The height represented by the section is about 600 feet. The outcrops of the section extend almost continuously for a distance of 20 miles along the Arroyo San Pedro. A similar section of upturned and beveled Cre- tacic strata is esposed near the town of Los Cerrillos. In the vicinity the same phenomenon is repeated hundreds of times. LAS VEGAS OF NEVADA "The Meadows" of southern Nevada constitute a vast even plain bor- dered by lofty mountains. Eastward from the town of Las Vegas ex- tends a long arm of these plains, which, as it passes between two ranges and joins Meadow valley to the east, is 6 to 8 miles wide. In this arm of the plain the geologic structure is well displayed (figure 3). w /. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
Size: 3108px × 804px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
