Graduate Thesis Or Dissertation
 

Origin and configuration of the present-day land surface, Goodhue County, Minnesota

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6t053m75v

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  • This study describes the surface configuration of Goodhue County and attempts to determine the origin of that configuration. The research has a descriptive portion--an objective examination of land surface configuration and the composition and distribution of rock material underlying that surface, and a theoretical portion--a speculative examination of the factors controlling the land surface configuration and discussion of the probable origin of that configuration. I found that the configuration of any land surface is described in terms of drainage and topography and that the origin and age of any land surface is determined by an examination of the materials making up that surface, the present and past processes acting on that surface, and the amount of time available for the processes to act. I also found that the age of land surface configuration is distinct from the age of the underlying materials and that the degree to which configuration of any land surface is dependent on structure, process, and time is dependent on the scale of the investigation and the surface itself. The surface of Goodhue County ranges in elevation from approximately 670 feet to 1275 feet. The southern two-thirds of the county is a broad upland; the northern third of the county is slightly lower and more dissected. The county has a dendritic and well-integrated drainage system and is underlain by virtually flat-lying sedimentary rocks and thick deposits of glacial drift. The surface configuration of Goodhue County is the result of: (1) geographic location near the center of North America and alongside its major river; (2) marine deposition during the early Paleozoic; (3) minor folding and faulting during the later Paleozoic; (4) extensive solution and erosion during the late Paleozoic and/or parts of the Mesozoic; (5) fluvial deposition during the Cretaceous; (6) glacial and glaciofluvial deposition during the early and middle Pleistocene; (7) aeolian deposition and mass movement late in the Pleistocene; and (8) fluvial erosion and deposition during the late Pleistocene and Recent.
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