Pilar Formation
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The Pilar Formation is a geologic formation that crops out in the Picuris Mountains of northern New Mexico. It has a radiometric age of 1488 ± 6 million years, corresponding to the Calymmian period.
Pilar Formation carbonaceous phyllite beds near Pilar, New Mexico.
Pilar Formation exposures on Arroyo del Plomo
Outcrop of Pilar Formation showing metatuff beds (white layers)
Sample of carbonaceous phyllite from the Pilar Formation
Hondo Group
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The Hondo Group is a group of geologic formations that crops out in most of the Precambrian-cored uplifts of northern New Mexico. Detrital zircon geochronology gives a maximum age for the lower Hondo
Pilar Formation
…Mya, considerably younger than the Rinconada Formation. This suggests that the Pilar Formation and Piedra Lumbre Formation should be removed from the Hondo Group (and placed in the informal Trampas Group) and provides evidence supporting the Picuris orogeny. The base of the formation is 2-3 meters of garnet-bearing…
Hondo Group (Ortega Formation) in the Tusas Mountains, New Mexico