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Lower middle Tertiary andesitic to dacitic lavas and pyroclastic flow breccias

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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.
State New Mexico
Name Lower middle Tertiary andesitic to dacitic lavas and pyroclastic flow breccias
Geologic age Upper to middle Eocene (33-43 Ma)
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)
Igneous > Volcanic > Felsic-volcanic > Latite (Flow)GEOLEX - part of Rubio Peak Formation - latite and rhyodacite flow units
Minor
Sedimentary > Clastic > Conglomeratevolcaniclastics associated with volcanics
Sedimentary > Carbonate > LimestoneAncient landslide blocks of Mader Limestone, as much as one mile long, occur within Rubio Peak lavas in the central Black Range, west of Winston.
References

Green, G.N., Jones, G.E., and Anderson, O.J., 1997, The Digital Geologic Map of New Mexico in ARC/INFO Format: U.S. Geological Survey Open-File Report 97-0052, 9 p., scale 1:500,000.

https://pubs.er.usgs.gov/publication/ofr9752

USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/

https://ngmdb.usgs.gov/Geolex/search
NGMDB product
Counties Catron - Colfax - Dona Ana - Grant - Hidalgo - Luna - Sierra - Socorro - Taos