Rinconada Formation
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The Rinconada Formation is a geologic formation that crops out in the Picuris Mountains of northern New Mexico. Detrital zircon geochronology establishes a maximum age for the Rinconada Formation of a
Rinconada Formation garnet-staurolite-muscovite schist beds near Pilar, New Mexico.
Crystals of staurolite weathered out of the Rinconada Formation, near Pilar, New Mexico.
Twinned staurolite from Rinconada Formation
Ortega Formation
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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
Rinconada Formation
…However, this reflects the crystallization age of the source rocks, and the true age is likely closer to 1723 Mya based on zircon ages in the underlying Ortega Formation. This indicates a shift in source region between the Ortega Formation and the Rinconada Formation. The formation is divided into three informal members…
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