Date of Award

1970

Document Type

Thesis

Degree Name

Bachelor of Science (BS)

Department

Geology

First Advisor

Dr. Frank R. Karner

Abstract

Eastern Grand Forks County lies within the glacial Lake Agassiz plain (Fig.2). The lacustrine sediments, as exposed in a drainage ditch along the east edge of sections 16, 21, and 28, T. 154 N., R. 52 W., northwest of Manvel, North Dakota, have been divided into two main groups: the lower bedded clays overlain by bedded, silty clays and silt. Separating these units is a limonite hardpan.

During the late receding stage of Lake Agassiz, tributary drainage developed cut and filled channels within the silt directly underlying the lake plain. Several such channels occur within the outcrop area in the upper three feet of Lake Agassiz sediments. Folding of these sediments by isostatic rebound accounts for the distorted sediments noted in the outcrop.

Size analyses prove these sediments are of lacustrine origin and that the channel structures are fluvial. Buried wood suggests an erosional interval during the closing stages of Lake Agassiz.

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