Thursday, June 19, 2014

The Purple Cilffs of the McDermott Formation

South of Durango lies this striking maroon cliff band of strata known locally as the Purple Cliffs and geologically as the McDermott Formation. It is believed by most geologist to be a fluvial deposit with debris flows and some volcaniclastic deposits from the La Plata Volcanic Intrusions to the northwest.. The deposit can be found throughout the Four Corners area and is dated to be on the Upper Cretaceous-Tertiary boundary (66 Million years old) and some fossils have been found in the formation here in Durango and also in exposures in New Mexico. I find them to be one of my favorite exposures in all of the Durango area.

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