Big Rock Formation
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The Big Rock Formation is a formation that crops out in the Tusas Mountains of northern New Mexico. Detrital zircon geochronology gives a maximum age for the formation of 1665 Mya, corresponding to th
Exposure of Big Rock Formation at Mesa la Jara, New Mexico
Marquenas Formation
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The Marquenas Formation is a geological formation that crops out in the Picuris Mountains of northern New Mexico. Detrital zircon geochronology gives it a maximum age of 1435 million years, correspond
Big Rock Formation
…The Big Rock Formation lies above the undivided lower Vadito Group and below the Burned Mountain Formation. It was long thought to correlate with the Marquenas Formation, but Marquenas Quartzite has been found via detrital zircon geochronology be much younger. The formation has been interpreted as a beach gravel or as…
Marquenas Formation with crosscutting dike, Picuris Mountains
Coarse conglomerate at the base of the Marquenas Formation
Middle quartzite section of Marquenas Formation
Sample of quartzite from the middle section of the Marquenas Formation