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Middle Tertiary volcaniclastic sedimentary units

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Mostly syneruptive volcaniclastic sedimentary aprons. Lower units dominantly derived from volcanic highlands of andesitic to dacitic composition. Locally includes minor lavas and tuffs. Younger units (above and intertongued with Mogollon Group tuffs, Turp) include upper Bell Top Formation, South Crosby Peak Formation, and upper Spears Group units near Quemado. Older units (below and intertongued with Datil Group tuffs, Tlrp) include Palm Park, lower Bell Top, Espinaso and Pueblo Creek Formatios and lower Spears Group formations such as Rincon Windmill, Chavez Canyon, and Dog Springs.
State New Mexico
Name Middle Tertiary volcaniclastic sedimentary units
Geologic age Oligocene to upper Eocene
Lithologic constituents
Major
Sedimentary > Clastic (Bed, Tuffaceous)GEOLEX - volcaniclastic sediments - mostly sandstone and conglomerates.
Unconsolidated (Alluvial, Fluvial)GEOLEX - volcaniclastic sediments - sand, gravel, boulders, clay, silt.
Minor
Igneous > Volcanic > Felsic-volcanic (Flow, Pyroclastic-ash flow, Pyroclastic-tuff, Volcaniclastic-volcanic breccia)GEOLEX - flows, tuffs, breccia and dikes of rhyolite and dacitic composition.
Igneous > Volcanic > Mafic-volcanic (Flow, Pyroclastic-ash flow, Pyroclastic-tuff, Volcaniclastic-volcanic breccia)GEOLEX - flows, tuffs, breccia and dikes of andesite, basalt, and basaltic-andesite.
References

New Mexico Bureau of Geology and Mineral Resources, 2003, Geologic Map of New Mexico, scale 1:500,000 (includes some new polygons, faults, and attributes not in NM001 - heads up digitizing by JHorton).

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

https://ngmdb.usgs.gov/Geolex/search
NGMDB product
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