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MAP

Topo

Rock Formations

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Topo

Ecoregions

Public Lands

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BASEMAPS

Default Weather

Temperature

Smoke

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WEATHER

Lower middle Tertiary andesitic to dacitic lavas and pyroclastic flow breccias (NMTla;0)

Geologic Formation in NM, AZ, CO

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Lithology

Andesite

Latite

Conglomerate

Other (629 mi²)

Geologic Age

Lutetian – Rupelian (43 Ma – 33 Ma ago)

Geologic Unit Label

Tla

Includes Rubio Peak Formation, Orejon Andesite, andesite of Dry Leggett Canyon, andesite of Telephone Canyon, and other units in southwestern, central, and northern New Mexico. Locally includes minor mafic lavas. Ancient landslide blocks of Mader Limestone, as much as one mile long, occur within Rubio Peak lavas in the central Black Range, west of Winston.

— USGS

Taxonomy

Classified As

Geologic Formation