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Preliminary Correlation And Isopach Map Of Navajo-Aztec-Nugget Sandstones, Western United States, Emily Jackson
Preliminary Correlation And Isopach Map Of Navajo-Aztec-Nugget Sandstones, Western United States, Emily Jackson
The Research and Scholarship Symposium (2013-2019)
Lower and middle Jurassic sandstones across western North America were correlated using stratigraphic thickness and lithofacies data obtained from the AAPG-produced Correlation of Stratigraphic Units of North America (COSUNA) data charts and spreadsheets. An isopach map and a series of stratigraphic cross-sections were created to display the lateral and horizontal extent of the correlated formations. The goal was to determine lateral equivalents of the primarily lower Jurassic Navajo Sandstone from Utah, Arizona, and Colorado. The Nugget Sandstone of Wyoming, Utah, and southern Idaho, and the Aztec Sandstone of southeastern California and southern Nevada were determined to be laterally equivalent to …
Correlation Of Basal Cambrian Sandstones Across North America, Joshua W. Perez
Correlation Of Basal Cambrian Sandstones Across North America, Joshua W. Perez
The Research and Scholarship Symposium (2013-2019)
A thin, widespread sequence of siliciclastic strata ranging from lower to upper Cambrian age overlies Precambrian crystalline and metamorphic basement rock bounded by the Great Unconformity. This sequence is mainly comprised of basal Cambrian sandstones which can be subdivided into three distinct suites of lithofacies transitioning in age across most of North America. From the west, which is most notable for the Tapeats sandstone of Arizona and Nevada, lies gravelly to boulder sized conglomerates directly overlying basement rock. Eastward, the lower to middle Cambrian consists of a variety of ledge-forming sandstones which contain various areas rich in cross bedded, as …