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Tertiary intrusive rocks of intermediate to silicic composition

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Includes monzonitic to granitic plutons, stocks, laccoliths, and porphyritic dikes in deeply eroded magmatic centers; and andesitic, dacitic, or rhyolitic plugs and dikes near cauldrons or stratovolcanoes. In the Latir field, fine-grained rhyolitic dikes commonly cut coarse-grained granitic plutons. Includes alkaline laccoliths, plugs, and dikes in Colfax County. North-trending dikes near Capitan include some mafic diabase dikes.
State New Mexico
Name Tertiary intrusive rocks of intermediate to silicic composition
Geologic age Pliocene to Eocene
Lithologic constituents
Major
Igneous > Plutonic > Syenitic (Pluton, Stock or pipe, Laccolith, Dike or sill)Includes monzonitic to granitic plutons, stocks, laccoliths, and porphyritic dikes in deeply eroded magmatic centers
Igneous > Plutonic > Granitic (Pluton, Stock or pipe, Laccolith, Dike or sill)Includes monzonitic to granitic plutons, stocks, laccoliths, and porphyritic dikes in deeply eroded magmatic centers
Minor
Igneous > Hypabyssal > Felsic-hypabyssal (Dike or sill)Andesitic, dacitic, or rhyolitic plugs and dikes near cauldrons or stratovolcanoes.
Igneous > Hypabyssal > Mafic-hypabyssal (Dike or sill)Andesitic, dacitic, or rhyolitic plugs and dikes near cauldrons or stratovolcanoes.
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 Bernalillo - Catron - Cibola - Colfax - Dona Ana - Grant - Hidalgo - Lincoln - Luna - McKinley - Otero - Rio Arriba - Sandoval - San Juan - Santa Fe - Sierra - Socorro - Taos - Torrance - Valencia