Valle Grande (1)

Sandoval County · NM Highway 4 -- mile marker 42.8

About one million years ago, the magnificent valley before you was formed by collapse, after a series of tremendous volcanoes eruptions ejected a volume of material more than 500 times greater than the May 1980 eruptions of Mt. St. Helens. This event climaxed more than 13 million years of volcanism in the Jemez Mountains. Minor volumes of magma, leaking to the surface as recently as 50,000 years ago, formed the dome-like hills between you and the skyline to the north, which is the opposite wall of the enormous Valles Caldera. The heat from the young volcanism makes this area attractive for geothermal energy.

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under a mile from where William Gabby lived in the 1760s

what this marker records spans 1777 to 1789, overlapping William Gabby's years here

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Marker data: Official Scenic Historic Markers program, New Mexico Historic Preservation Division, Department of Cultural AffairsMarker texts come from the Division’s published marker spreadsheet, reproduced with the Division’s written permission. Where that spreadsheet records a coordinate, the pin is the Division’s own; where it records only a highway and mile marker, an address, a junction or a named place, or where its coordinate contradicts its own highway, mile and county, the pin is ours, resolved on public road and place data and marked approximate.

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