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Spatial Reference:
102039
(102039)
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Comments: A digital dataset of the geomorphology of the Lower Mississippi River Valley throughout Missouri, Kentucky, Arkansas, Tennessee, Louisiana, and Mississippi was developed from Roger T. Saucier’s “Geomorphology and Quaternary Geologic History of the Lower Mississippi Valley” (1994) as part of the Mississippi Alluvial Plain (MAP) Regional Water Availability Study. Maps associated with Saucier’s report contain a comprehensive overview of the previously misunderstood alluvial valley geology, including mapping of 29 Pleistocene and Holocene alluvial deposits, such as point bars, abandoned channels, backswamps, and natural levees (Saucier, 1994). Maps were georeferenced to North American Datum 1983 and projected to USA Contiguous Albers Equal Conic (USGS version) projection (standard parallels 29.5 and 45.5 degrees, central meridian -96 degrees, and latitude of origin 23 degrees). Once georeferenced (using ArcMap v 10.4.1), individual geomorphological features were digitized manually. Each polygon was validated using a geodatabase topology and the Topology Editor tools in ArcMap; this was done to create individual polygons without gaps or overlap. Efforts were made to match colors in the original map legend in the digital product, with the exception of a few features listed in the original key (for example, feature “Pve” does not match the exact color in the plates). Updated colors were selected to ease of distinction between similarly colored features. The digital dataset increases the usability of Saucier’s seminal geomorphological work, allowing for a better understanding of the Quaternary geology and geomorphology within the Lower Mississippi by scientists and engineers who are among many fields of study. Saucier envisioned his work to be utilized by engineering geologists, who are focused on studies that focus on major regions or the entire valley (Saucier,1994).
Subject: These data were digitized as part of the United States Geological Survey (USGS) Mississippi Alluvial Plain Water Availability Study to provide a digital resource of alluvial geomorphology.
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Keywords: Saucier, geomorphology, Mississippi Alluvial Plain, Mississippi, Arkansas, Louisiana, Kentucky, Tennessee, Missouri, Illinois
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