Lower middle Tertiary volcanic rocks (NMTlv;0)

Lower middle Tertiary volcanic rocks

Mostly intermediate lavas of the lower Datil Group and intermediate volcaniclastic sediments of the lower Spears Group (Tla+Tvs). Locally includes ash-flow tuffs of the upper Datil Group (Tlrp). Includes intermediate volcaniclastic sedimentary rocks of the Conejos Formation in northern New Mexico.

State	New Mexico
Name	Lower middle Tertiary volcanic rocks
Geologic age	Lower Oligocene to upper Eocene (older than 31 Ma)
Lithologic constituents	Major Sedimentary > Clastic (Tuffaceous)intermediate volcaniclastic sedimentary rocks. Igneous > Volcanic > Mafic-volcanic > Andesite (Flow, Pyroclastic-ash flow)GEOLEX Igneous > Volcanic > Felsic-volcanic (Flow, Pyroclastic-ash flow)GEOLEX - rhyolite and latite
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	NGMDB product page for 22974
Counties	Catron - Dona Ana - Grant - Hidalgo - Luna - Rio Arriba - Sierra - Socorro

Lower middle Tertiary volcanic rocks

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.

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