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Show "Dirty River Eyebrow" Studied by Geologists Chicago. Grimly glowering at the western edge of the Albuquerque plain in New Mexico, a great black cliff, called the Leja del Rio Puerco (Eyebrow of the Dirty River, in English) tells geologists a weird tale of volcanic eruptions in the not very distant past, Dr. Kirk Bryan, Harvard university geologist, reports re-ports in the Journal of Geology. He and Dr. Franklin T. McCann, of Dayton, Ohio, studied the area. Long ago, when the Rio Grande flowed in a channel 500 feet higher than the present one, they find, lavas from Mount Taylor, a volcano active before the ice ages, poured over the plain. Later the rivers cut into the lavas, creating grim escarpments es-carpments like the "eyebrow." Still later, the Rio Puerco cut into the headwaters of streams flowing into the Rio Grande from the west, "pirating" "pi-rating" the waters. |