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
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
NGMDB product
Counties Catron - Dona Ana - Grant - Hidalgo - Luna - Rio Arriba - Sierra - Socorro