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The Ceja del Rio Puerco: A Border Feature of the Basin and Range Province in New Mexico. II. Geomorphology

1938; University of Chicago Press; Volume: 46; Issue: 1 Linguagem: Inglês

10.1086/624618

1537-5269

Kirk Bryan, Franklin T. McCann,

Botany and Geology in Latin America and Caribbean

The deformed beds of the Llano de Albuquerque are beveled and overlain by a cover of gravel, caliche, soil, and wind-blown sand 5-70 feet thick. Topographically the Llano de Albuquerque is a plain which slopes gently eastward toward the Rio Grande and is surrounded by escarpments and erosional slopes; it is a remnant of a once widespread erosion surface made up of coalescing pediments graded to the Rio Grande. At the time of formation of this surface, here named Ortiz, the Rio Grande had a grade about 500 feet above the present. On it were poured the great basaltic flows of the Mount Taylor region. The Ortiz surface has been dissected and largely destroyed by several successive lowerings of the grade of the Rio Grande. In the first period of dissection following Ortiz time the Rio Puerco gained its north-south course by piracy of certain western tributaries of the Rio Grande flowing in a southeasterly direction out of the Plateau Province. The vulcanism and erosion of later cycles are briefly summarized.