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Holocene Climatic Change In The Central United States Inferred From Paleoecological Data., Raymond P. Latimer
Holocene Climatic Change In The Central United States Inferred From Paleoecological Data., Raymond P. Latimer
Student Work
The Holocene in the central U.S. is the period of time since the retreat of the last continental ice sheets. It has been a 10,000 year period of climate variability. In North America, Holocene climatic fluctuations have been detected in the paleoenvironmental record of the central United States. The most evident climactic fluctuation has been the mid-Holocene Climatic Optimum, or Altithermal. The Altithermal provided the warmest and driest post-glacial climatic conditions which lasted from ca. 8500-4000 years B.P.
The Phytogeomorphology Of The Niobrara Region Near Meadville, Nebraska., Barbara J. Pollack Friskopp
The Phytogeomorphology Of The Niobrara Region Near Meadville, Nebraska., Barbara J. Pollack Friskopp
Student Work
One of the most phytogeomorphologically unique areas of Nebraska occurs along the Niobrara River Valley north of the community of Ainsworth. Not only is this an area where the Rocky Mountain, Eastern Deciduous and Northern Boreal Forest converge, but it is also an area of relatively recent geomorphic activity. Landslides are known to have occurred here; there is evidence of very recent, active movement as well as older, stabilized landslides. The purpose of this study was to examine the relationship between plant communities and geomorphic history. Three 100 m long transects were surveyed in each of the five study areas, …
Quaternary Geomorphology Of The Meadville Slope Failure ; Niobrara River Valley, Nebraska (Geomorphological Mapping)., Mahtab A. Lodhi
Quaternary Geomorphology Of The Meadville Slope Failure ; Niobrara River Valley, Nebraska (Geomorphological Mapping)., Mahtab A. Lodhi
Student Work
This study area is located 2 km south of Meadville town on the right bank of the Niobrara River. Lying on the cut-bank side in the meander curve of the Niobrara River, the area is subjected to intensive slope failure of numerous forms, further accelerated by the continuous and very rapid later undercutting of the steep cliffs by the Niobrara River, and the unstable geologic formation exposed in the area. The impermeable Pierre Shale of the Cretaceous period and overlying Rosebud and Valentine formations of the Tertiary period are highly susceptible to mass wasting. The instability of the Pierre Shale …