Paleocurrents and Depositional Environments of the Dakota Group (Cretaceous), San Miguel County, New Mexico
Figure 3: Basal Cretaceous Strata ...
Figure 31: Compass Rose Diagrams ...
AuthorBejnar, Craig Russel
bedding plane irregularities
Mora County New Mexico
planar bedding structures
San Miguel County New Mexico
Geology -- New Mexico -- San Manuel County
Committee ChairWilson, Richard F.
MetadataShow full item record
PublisherThe University of Arizona.
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AbstractThe Dakota Group surrounding Las Vegas, New Mexico, consists of three units: 1) a basal, predominately trough cross-stratified, conglomeratic sandstone, 2) middle intercalated, thin-bedded sandstone and carbonaceous shale, and 3) upper, predominately tabular-planar cross-stratified, sandstone containing trace fossils. These units represent, respectively, 1) a fluvial piedmont plain, 2) fluvial coastal plain, and 3) a beach, littoral, and shallow marine complex. The cross-stratification in the lower sandstone unit indicates an easterly paleoslope. The cross-stratification in the upper sandstone unit has a bimodal distribution almost at right angles to the paleoslope, suggesting deposition by longshore currents. The standard deviation of the cross-stratification in the lower sandstone unit of 78° is typical of fluvial deposits. The standard deviation in the upper sandstone unit of 97° indicates a marine origin.
Degree ProgramGraduate College
Degree GrantorUniversity of Arizona
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