• Defining Colluvium and Alluvium

    To better understand how researchers differentiate these two materials and to look for common ground between different perspectives, this poster is promoting a survey of how people define them. One early respondent described the survey as “a lot of fun.” We hope you enjoy it too!

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  • What is Colluvium? An Interactive Poster Seeking a Common Definition to Improve International Communication

    This poster first attempts to summarize the variety of definitions for colluvium. Then it begins an experiment of asking viewers to identify the terminology they would use to define colluvium and alluvium as well as distinguish between the two.

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  • Colluvium vs Alluvium

    Among various Earth scientists, I’ve encountered slightly different definitions for colluvium and, by association, alluvium. The definitions for colluvium and alluvium are interdependent because their respective definitions are partially based on distinguishing one from the other. In other words, a set of characteristics is being used to split into two classes something that could be defined as one thing. Nonetheless, their distinction is important for communicating key characteristics, geomorphic setting, and inferred processes.

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  • Comparison of surficial geology maps based on soil survey and in depth geological survey

    Despite the widespread availability of relatively detailed soil maps in the USA, few areas have a surficial geology map published with as much spatial detail. This apparent gap between disciplines calls to question the accuracy of soil maps to represent the spatial distribution of surficial geologic materials. Therefore, the purpose of this research was to test the agreement between maps from these two sources.

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  • Physiography of the Des Moines Lobe

    This GIS package contains a pair of spatial data sets that have been generated for the purpose of studying the physiography of the Des Moines Lobe landform region. Includes a 10 m resolution grid interpreting the surficial geology from gSSURGO. Also includes a polygon shapefile that delineates the Des Moines Lobe into physiographic regions based on that surficial geology map and relief.

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  • Using soil surveys to map Quaternary parent materials and landforms

    The integration of soil survey maps with Geographic Information Systems (GIS) allows for an almost infinite level of collaboration across disciplines that use information related to soil databases. This study created a Quaternary geologic map by categorizing soil descriptions into a geologic context and joining the attributes with the Soil Survey Geographic (SSURGO) database in ArcGIS®. The resulting map communicates many of the spatial intricacies of the Des Moines Lobe landform with 15 map units based on geologic units.

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