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TEMSLV2011 Transient electromagnetic (TEM) soundings were made in the San Luis Valley, Colorado, to map the location of a blue clay unit as well as to investigate the presence of suspected faults. A total of 147 soundings were made near and in Great Sand Dunes National Park and Preserve, and an additional 6 soundings were made near Hansen Bluff on the eastern edge of the Alamosa National Wildlife Refuge. The blue clay is a significant hydrologic feature in the area that separates an unconfined surface aquifer from a deeper confined aquifer. Knowledge of its location is important to regional hydrological models. Previous analysis of well logs has shown that the blue clay has a resistivity of 10 ohm-meters or less, which is... Types: Citation; Tags: Alamosa County, Alamosa National Wildlife Refuge, Colorado, Great Sand Dunes National Park, Great Sand Dunes National Preserve, All tags... Saguache County, San Luis Valley, TEM, aquifer, clay, clay deposits, electromagnetic surveying, fault detection, faulting (geologic), geophysics, geoscientificInformation, groundwater, subsurface mapping, subsurface maps, transient electromagnetic sounding, Fewer tags TEMSLV2009 Transient electromagnetic (TEM) soundings were made in the San Luis Valley, Colorado, to map the location of a blue clay unit as well as to investigate the presence of suspected faults. A total of 147 soundings were made near and in Great Sand Dunes National Park and Preserve, and an additional 6 soundings were made near Hansen Bluff on the eastern edge of the Alamosa National Wildlife Refuge. The blue clay is a significant hydrologic feature in the area that separates an unconfined surface aquifer from a deeper confined aquifer. Knowledge of its location is important to regional hydrological models. Previous analysis of well logs has shown that the blue clay has a resistivity of 10 ohm-meters or less, which is... Types: Citation; Tags: Alamosa County, Alamosa National Wildlife Refuge, Colorado, Great Sand Dunes National Park, Great Sand Dunes National Preserve, All tags... Saguache County, San Luis Valley, TEM, aquifer, clay, clay deposits, electromagnetic surveying, fault detection, faulting (geologic), geophysics, geoscientificInformation, groundwater, subsurface mapping, subsurface maps, transient electromagnetic sounding, Fewer tags