1995 McGrath-Stromatolite Morphology and Depositional Characteristics |
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Object Description
| Title | Stromatolite Morphology and Depositional Characteristics of the Lower Ordovician Prairie Du Chien Group, Willow River Member |
| GAC Student Author | McGrath, Andrew |
| Description | The Lower Ordovician Prairie Du Chien Group is a mixture of carbonatesiliciclastic sediments, extensively observable over much of southeastern Minnesota. The Willow River Member is the youngest division of the Prairie Du Chien Group, deposited between 485-490 m.y. ago. In Fillmore Co., along highway 52, at the junction of the Root River, a quarter-mile exposure of Willow River Member reveals four distinct assemblages of stromatolite (i.e. sediment binding cyano-bacteria) growth. The first three layers of occurrence are primarily: Low-relief, continuous, stratiform to psuedocolumnar laminations, ranging in height from 4-7 inches vertically. The fourth assemblage consists of non-linked, discontinuous, dome to bulbous biostromes ranging spatially (in two dimensions) 8" x l'2" to 1'9" x 2'6". Available morphologies and characteristics of the trapped sediment within the stromatolites imply upper and lower intertidal depositional conditions. |
| Date Original | 1995 |
| Type | Text |
| Format | application/pdf (portable document) |
| Language | English; |
| Rights Management | (c) student author |
| Department |
Geology Department |
| Faculty Supervisor |
Carlson, Keith J. |
| Publication Type |
Thesis |
| Date Online | 2017-06-02 |
Description
| Title | 1995 McGrath-Stromatolite Morphology and Depositional Characteristics |
| Type | Text |
| Format | application/pdf (portable document) |
| Language | English; |
| Rights Management | (c) student author |
| Department |
Geology Department |
| Publication Type |
Thesis |
| Date Online | 2017-06-02 |