Ortega Formation
Videos
The Ortega Formation is a geologic formation that crops out in most of the mountain ranges of northern New Mexico. Detrital zircon geochronology establishes a maximum age for the formation of 1690-167
Ortega Formation at its type section near Ancones, New Mexico
Boulder of Ortega Formation near Ancones, New Mexico
Massive exposures of Ortega Formation underlie the Brazos Cliffs
Pilar Formation
Videos
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.
Ortega Formation
…member, and including the feldspathic Petaca Schist in the Tusas Mountains. Arthur Montgomery recognized the Rinconada schist as well but included the Pilar slate in the Ortega Formation while assigning some of the schist and conglomerate beds to his Vadito Formation. During mapping of the Las Tablas area, Barker…
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