Cat Hills Volcanic Field


Location: 34°48' to 34°57', 106°45' to 106°55' W, Bernalillo County
Type: Young basaltic scoria cones and flows located along the central axis of the Rio Grande rift
Age: 0.14 ± 0.038 Ma to ~0.1Ma
Significance:

Alignment along fissure-like trend; young age



 


The Cat Hills are a series of small scoria cones and associated lava flows erupted on the Llano de Albuqueruque (the central floor of the Rio Grande rift and part of Isleta Pueblo lands)  around 100,00 years ago. These are arguably the youngest volcanoes within the Rio Grande rift. Many of the cones have been quarried for "cinder" and at least one is completely quarried away.This is unfortunate because the cones are unusual landforms, rather uncommon on the North American continent as a whole.

Wind Mesa is much older (about 4 million years) and is technically not a part of the young Cat Hills eruptions but instead represents earlier basaltic eruptions that took place here even earlier.

 A view of the Cat Hills volcanic field from the air shows how the cluster of scoria cones aligns in north-south arrangement. Note that the Cat Hills volcanic field, like the Albuquerque volcanoes to the north are actually situated in the center of the Albuqueruqe Basin part of the Rio Grande rift.

Photo Credit : Larry Crumpler

 


 

Quarried North Cone.

Many of these cones have been extensively quarried for cinder. Scoria cones as young as those in the Cat Hills are are among the rarest landforms on the North American continent. Yet in this example the original cone has been completely removed from the landscape of New Mexico 

photo credit: Larry Crumpler

 


 

View from the rim of the  South Cat Hills cone looking north along the Cat Hills volcano alignment. Unlike the classic linear fissure morphology of the Albuquerque Volcanoes a few miles to the north, the Cat Hills are a more loosely aligned fissure trend consisting of distinct small scoria cones.

Photo credit: Larry Crumpler

 



Wind Mesa is a fairly old (4 million years) sheet of basalt surrounding a small concentration of scoria (in outcrops near the center of this image). The overall structure appears to be that of an eroded and faulted  small shield volcano. It is possible that the Wind Mesa volcano was origianlly similar to the modern day Albuquerque volcanoes. Another interesting thing here is that a north-south trending graben ternds trhough the middle of  the shield and illustrates the abundance of faulting along the central Rio Grande rift just in the past 4 million years alone. The range of mountains on the horizon in the center distance to the north  is actually the rim of the Valles Caldera. On the right are the Sandia Mountain that form the eastern margin of the rift while the green band on the right is the bosque along the Rio Grande.

Photo credit: Larry Crumpler



 

View of the south end of the Cat Hills volcanic field from NM Highway 6

Photo Credit: Larry Crumpler

 


 

The southernmost of the Cat Hills volcanic field scoria cones. This cone  has a perfectly preserved summit crater, and relatively dark and unweathered scoria. The Cat Hills are probably one of the youngest volcanic areas within the northern Rio Grande rift and this is one of the youngest cones.

Photo Credit: Larry Crumpler

 



View Cat Hills Volcanic Field in a larger map


Further Reading

General geology and relation to the Rio Grande rift:
Kelley, V. C., and A. M. Kudo, 1978, Volcanoes and related basalts of Albuquerque basin, New Mexico. New Mexico Bureau of Mines and Mineral Resources, Circular 156, 30p.

Petrology and Lithology:
Baldridge, W. S., 1979, Petrology and petrogenesis of Plio-Pleistocene basaltic rocks from the central Rio Grande rift New Mexico and their relationship to the Rift, in Riecker, R. E., editor, Rio Grande Rift: Tectonism and Magmatism, American Geophysical Union, Washington, D.C., p. 323-353.

 


All text and Photo credit due to Dr. Larry Crumpler, New Mexico Museum of Natural History and Science 


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