Geologic map of the Tetilla Peak quadrangle, Santa Fe and Sandoval Counties, New Mexico

The quadrangle includes the west part of the village of La Cienega along its eastern border and includes the southeasternmost part of the Cochiti Pueblo reservation along its northwest side. The central part of the quadrangle consists of Santa Fe National Forest and Bureau of Land Management lands, and parts of several Spanish-era land grants. Interstate 25 cuts through the southern half of the quadrangle between Santa Fe and Santo Domingo Pueblo.

Canada de Santa Fe, a major river tributary to the Rio Grande, cuts through the quadrangle, but there is no dirt or paved road along the canyon bottom. A small abandoned uranium mine (the La Bajada mine) is found in the bottom of the Canada de Santa Fe about 3 km east of the La Bajada fault zone; it has been partially reclaimed. The surface geology of the Tetilla Peak quadrangle consists predominantly of a thin (1-2 m generally, locally as thick as 10? m) layer of windblown surficial deposits that has been reworked colluvially.

Locally, landslide, fluvial, and pediment deposits are also important. These colluvial deposits mantle the principal bedrocks units, which are (from most to least common): (1) basalts, basanites, andesite, and trachyte of the Pliocene (2.7-2.2 Ma) Cerros del Rio volcanic field; (2) unconsolidated deposits of the Santa Fe Group, mainly along the western border, in the hanging wall of the La Bajada fault zone, but locally extending 2-3 km east under the Cerros del Rio volcanic field; (3) older Tertiary volcanic and sedimentary rocks (Abiquiu?, Espinaso, and Galisteo Formations); (4) intrusive rocks of the Cerrillos intrusive center that are roughly coeval with the Espinaso volcanic rocks; and (5) Mesozoic sedimentary rocks ranging in age from the Upper Triassic Chinle Formation to the Upper Cretaceous Mancos Shale.

GEOSPATIAL DATAFILES AND OTHER FILES INCLUDED IN THIS DATA SET: Map political location: Santa Fe and Sandoval Counties, New Mexico Compilation scale: 1:24,000 Geology mapped: 1996-1998 >tepk_geol: geologic units, faults, dikes, volcanic flow boundaries >tepk_struct: bearing and attitude measurements of structural features >tepk_bed: attitude measurements of geologic units >tepk_chem: geochemical and geochronologic data by sample >tepk_amt: audio-magneto-telluric (AMT) geophysical sample data >tepk_wells: water well locations >tepk_marker: cartographic decorations (bar and ball symbol, etc.) >color524.shd: ArcInfo shadeset used to color geology polygons >geoscamp1.mrk: ArcInfo markerset used to plot geologic symbols >geoscamp1.lin: ArcInfo lineset used to plot geologic line symbols >tepk_base.tif,.tfw: 1:24,000-scale topographic base