Electronic Theses and Dissertations

Identifier

1425

Date

2015

Document Type

Thesis

Degree Name

Master of Science

Major

Earth Sciences

Concentration

Geology

Committee Chair

Roy Van Arsdale

Committee Member

Dan Larsen

Committee Member

Randel T Cox

Abstract

Crowley's Ridge is a topographic ridge composed of unconsolidated Eocene, Pliocene, and Pleistocene sediment that extends from Helena, Arkansas, to Thebes, Illinois. The ridge has been described as an erosional divide separating the Eastern and Western Lowlands of the Mississippi River Valley in Arkansas. However, north-south trending faults have been proposed along the east and west ridge margins based on seismic reflection lines. Based on changes in Pliocene Upland Complex gravel elevations, previous studies have also proposed east-west striking normal faults within Crowley's Ridge. In this current study, lignite exploration electric and lithologic logs and water well logs were interpreted on and adjacent to the northern half of Crowley's Ridge. Three internal faults trend north-south within Crowley's Ridge. Additionally, east-west trending cross sections revealed approximately 30m of displaced Eocene strata across the eastern and western ridge margins, which support the interpretation of post-Eocene tectonic uplift of Crowley's Ridge.

Comments

Data is provided by the student.

Library Comment

Dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.

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