Date of Award

8-1-1990

Document Type

Thesis

Degree Name

Master of Arts (MA)

Department

Geography and Geology

First Advisor

Dr. John F. Shroder

Abstract

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 and the impermeability of the Rosebud formations are the major causes of slope failure and associated geomorphic features in this area. The study is focused on the types of mass wasting caused by the above mentioned lithologic units and the preparation of geometric maps showing sites and types of mass wasting and other associated features. The study site, which covers approximately and area of 0.8 by 2.0 km, was mapped on a large scale topographic map. The geomorphological map was compiled and prepared from the data obtained as the result of several field trips, field photography, and the interpretation of aerial photographs in black and white and color infared.

Comments

A Thesis Presented to the Department of Geography-Geology and the Faculty of the Graduate College University of Nebraska In Partial Fulfillment of the Requirements for the Degree Master of Arts University of Nebraska at Omaha. Copyright 1990 Mahtab A. Lodhi.

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