Geologic Map of the San Luis Hills Area, Conejos and Costilla Counties, Colorado
January 1, 1989
This report is a digital image of the U.S. Geological Survey Miscellaneous Investigations Series Map I-1906, 'Geologic map of the San Luis Hills area, Conejos and Costilla Counties, Colorado,' which was published in 1989 by Thompson and Machette, scale 1:50,000 but has been unavailable in a digital version. The map area represents the southwestern portion of the Alamosa 30' x 60' quadrangle, which is currently being remapped by the U.S. Geological Survey. The northern and eastern margins of the San Luis Hills area have been remapped at greater detail and thus small portions of the map area have been updated. The northern margin is shown on U.S. Geological Survey Open-File Report 2005-1392, the northeastern portion is shown on U.S. Geological Survey Open-File Report 2008-1124, and the eastern margin is shown on U.S. Geological Survey Open-File Report 2007-1074. The most significant changes to the 1989 map area are recognition of Lake Alamosa and its deposits (Alamosa Formation), remapping of bedrock in the northeastern San Luis Hills, and redating of volcanic units in the San Luis Hills. Although unpublished, new 40Ar/39Ar ages for volcanic units in the Conejos and Hinsdale Formations add precision to the previous K/Ar-dated rocks, but do not change the basic chronology of the units. The digital version of this map was prepared by Theodore R. Brandt by scanning the original map at 300 pixels per inch, prior to creating the press-quality (96 Mb) and standard (5 Mb) .pdf files.
Citation Information
Publication Year | 1989 |
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Title | Geologic Map of the San Luis Hills Area, Conejos and Costilla Counties, Colorado |
DOI | 10.3133/i1906 |
Authors | Ren A. Thompson, Michael N. Machette |
Publication Type | Report |
Publication Subtype | USGS Numbered Series |
Series Title | IMAP |
Series Number | 1906 |
Index ID | i1906 |
Record Source | USGS Publications Warehouse |
USGS Organization | Earth Surface Processes |