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
Piedra Lumbre Formation
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The Piedra Lumbre Formation is a geologic formation that crops out in the Picuris Mountains of northern New Mexico. Detrital zircon geochronology yields a maximum age of 1475 million years, correspond
Pilar Formation
…ft). The contact with the underlying Rinconada Formation is an unconformity representing a 200 million year gap, while the contact with the overlying Piedra Lumbre Formation is gradational. Because of its distinctive appearance, the formation is an important structural marker, which provided evidence that the Hondo Group…
Outcrop of Piedra Lumbre Formation along highway from Dixon to Picuris Pueblo, New Mexico, USA
Piedra Lumbre Formation, upper left, in contact with thinner beds of Pilar Formation, lower right