{05ACB51B-2EC6-4D3B-894C-F54F41E0104B}2008072917425200FALSE20090814151755002009081415175500\\Agustin\statemap\AMP_NAD83\espanola_basin\eb_spatial\OFR-519_Ancha_Fm\vector_files\Ancha_contours_0708.shpDaniel J. Koning (New Mexico Bureau of Geology) interpreted depth to base of Ancha Formation from cuttings, core and/or geophysical logs of key drill holes. Peggy Johnson (New Mexico Bureau of Geology) directed the research and interpreted depth to base of Ancha Formation in generalized logs from water wells. Daniel J. Koning and Paul Drakos of Glorieta Geoscience completed geologic maps of the basal contact from outcrop exposures. Brigitte Felix (New Mexico Bureau of Geology) generated elevations of outcrop exposures of the basal contact in ARCINFO 9.2. Peggy Johnson compiled the entire set of point data and generated surface and basal elevations. Kriging functions were performed by Brigitte Felix to generate elevation contours and Peggy Johnson manually generated final contours of the formation base. Brigitte Felix created a TIN surface of the base of the formation. Generation of the point data and basal contours spanned several years from 2006-2008. Ancha_contours_0708Ancha_contours_0708vector digital dataMicrosoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850enThe Pliocene-lower Pleistocene Ancha Formation consists of sand, gravel and silt that forms the upper portion of the Santa Fe Group basin fill in the southern Española Basin of the Rio Grande rift, northern New Mexico. The Ancha Formation forms a locally important shallow aquifer for the Santa Fe area. The thickness and characteristics of the formation's base are important to regional groundwater studies, and are also useful for other studies involving basin stratigraphy, structure, geophysical interpretations, and basin evolution. The base of the Ancha Formation coincides with a Pliocene erosional surface that bevels tilted and faulted beds of underlying (upper Oligocene-upper Miocene) Tesuque Formation, (Oligocene) Espinaso Formation, (late Paleocene-late Eocene) Galisteo Formation, and, locally, Mesozoic and Paleozoic units. In order to characterize the thickness and the basal contact of the Ancha Formation, three data sets were evaluated: (1) cuttings, core and/or geophysical logs of key exploration drill holes, monitor wells, and water wells; (2) generalized lithologic logs from water wells; and (3) outcrop exposures of the basal contact. Data points are uniquely symbolized to show data type and labeled with a point ID and elevation of the formation base.
These point data were systematically used to generate the elevation contours of the base of the formation. First, the Ancha Formation basal contact was clearly identified at key sites with cuttings, core, geophysical logs, and/or detailed lithologic logs generated by a geologist. Second, the basal contact was extrapolated to nearby low-resolution lithologic logs from water wells. Third, outcrop exposures of the basal contact were physically mapped and translated to point data. Fourth, the surface elevations of data sites were generated from a 10-m digital elevation model (DEM) and elevations of the base of formation in wells and drill holes were calculated from surface elevation minus depth to basal contact. Lastly, contours of the elevation of the formation base were interpolated from point data with a kriging function in ARC INFO 9.2. The line contours were used to create a Triangular Irregular Network (TIN) surface, and the Ancha_extent_boundary was used to clip the TIN to the area of study. Paleovalley divides were created manually from the paleotopography of the contoured surface.To characterize the base of the Ancha Formation.The data are not time-dependent and are current through 2008. New wells and exploration drill holes could generate minor changes to the surface.2008None planned-106.242933-105.85958735.71020035.438496387558.789365421982.4237623922178.3333183951949.234621Española Basin; Ancha Formation; elevation contours of formation base; formation thickness; paleovalleyEspañola Basin, Santa Fe embayment, Rio Grande rift, northern New MexicoNoneUsers are requested to acknowledge the authors (P. Johnson, D. Koning & B. Felix, NMBGMR) in any public use of these data. ShapefilePeggy Johnson New Mexico Bureau of Geology & Mineral ResourcesSenior Hydrogeologist575-835-5819peggy@gis.nmt.eduP. Johnson, D. Koning & B. Felix, NMBGMRfile://\\Agustin\statemap\AMP_NAD83\espanola_basin\eb_spatial\OFR-519_Ancha_Fm\vector_files\Ancha_contours_0708.shpLocal Area Network0020.057ShapefileDataset moved.\\Agustin\statemap\AMP_NAD83\espanola_basin\eb_spatial\geology\project_geology\ancha\Ancha_contours_070820080729Dataset moved.\\Agustin\statemap\AMP_NAD83\espanola_basin\eb_spatial\geology\project_geology\ancha\LANL\Ancha_contours_070820080915Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850Ancha_contours_0708387558.789365421982.4237623951949.2346213922178.3333181-106.242933-105.85958735.710235.4384961enFGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998local timemailing and physical addressSocorroNM87801New Mexico Bureau of Geology & Mineral ResourcesNew Mexico Tech801 Leroy PlaceUSAPeggy Johnson, 575-835-5819peggy@gis.nmt.eduBrigitte Felix, 575-835-5177New Mexico Bureau of Geology & Mineral Resources, New Mexico TechPeggy Johnson and Brigitte Felixbfk@gis.nmt.edu20090814http://www.esri.com/metadata/esriprof80.htmlESRI Metadata ProfileISO 19115 Geographic Information - MetadataDIS_ESRI1.0datasetDownloadable Data0.0570.057VectorSimplePolylineFALSE100TRUEFALSEString100GCS_North_American_1927NAD_1927_UTM_Zone_13Ncoordinate pairmeters0.0000000.000000Universal Transverse Mercator130.999600-105.0000000.000000500000.0000000.000000North American Datum of 1927Clarke 18666378206.400000294.978698NAD_1927_UTM_Zone_13N100Ancha_contours_0708Feature Class100FIDFIDOID400Internal feature number.ESRISequential unique whole numbers that are automatically generated.ShapeShapeGeometry000Feature geometry.ESRICoordinates defining the features.IDIDNumber6INTERVALINTERVALString13CONTOURCONTOURNumber16TYPETYPENumber30220090814