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Full-Text Articles in Physical Sciences and Mathematics
Ice Segregation As An Origin For Lenses Of Non-Glacial Ice In “Ice-Cemented” Rock Glaciers, William J. Wayne
Ice Segregation As An Origin For Lenses Of Non-Glacial Ice In “Ice-Cemented” Rock Glaciers, William J. Wayne
Department of Earth and Atmospheric Sciences: Faculty Publications
ABSTRACT. In order to flow with the gradients observed (10° to 15°) rock glaciers cannot be simply ice-cemented rock debris, but probably contain masses or lenses of debris-free ice. The nature and origin of the ice in rock glaciers that are in no way connected to ice glaciers has not been adequately explained. Rock glaciers and talus above them are permeable. Water from snow-melt and rain flows through the lower part of the debris on top of the bedrock floor. In the headward part of a rock glacier, where the total thickness is not great, if this groundwater flow is …
Kansan Proglacial Environment, East-Central Nebraska, William J. Wayne
Kansan Proglacial Environment, East-Central Nebraska, William J. Wayne
Department of Earth and Atmospheric Sciences: Faculty Publications
A stream bank along a tributary of Salt Creek in east·central Nebraska displays a sequence of sediments deposited along an eastward flowing stream during part of the approach and subsequent retreat of the last ice sheet to expand into this area during the Kansan glaciation. The section exposes a series of beds of calcareous silt which contain fossil·rich lenses. Sediment characteristics and the habitat requirements of 31 species of snails recovered suggest that the silts accumulated on an aggrading floodplain and probably were derived from erosion of unweathered cal· careous till and calcareous wind·blown silts deposited during an earlier ice …