A Stratigraphic Study of Beach Features on the Southwestern Shore of Lake Michigan PDF Download
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Author: Curtis E. Larsen
Publisher:
ISBN:
Category : Beach ridges
Languages : en
Pages : 44
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Book Description
Author: Curtis E. Larsen
Publisher:
ISBN:
Category : Beach ridges
Languages : en
Pages : 44
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Book Description
Author: Curtis E. Larsen
Publisher: Forgotten Books
ISBN: 9780428056704
Category : Science
Languages : en
Pages : 44
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Book Description
Excerpt from A Stratigraphic Study of Beach Features on the Southwestern Shore of Lake Michigan: New Evidence of Holocene Lake Level Fluctuations This study of a beach ridge complex along the southwestern shore of Lake Michigan provides new evidence of long-term trends in water level fluc tuations of Lakes Michigan and Huron that are not discernible in the short, 125-year historic record of measured lake level changes. Radiocarbon age control of lake terraces and other beach features provided by dates from buried peat and fossil wood indicates that during the past years lake levels were markedly higher and lower than present levels for periods on the order of centuries. This suggests that historically recorded levels, con sidered high by modern standards, may represent a relatively low cycle on a naturally fluctuating trend. Study results thus have important implications for engineers and hydrologists concerned with planning and construction along the lake shore. The established geological history of the Great Lakes region recognizes three prominent lake stages in the postglacial Upper Great Lakes the Nipissing stage B. P. L, the Algoma stage and modern Lakes Michigan and Huron B. P. To present). The Nipis sing stage was initiated when differential isostatic uplift raised northern outlet channels above southern outlets, causing the lakes to rise and drain through preexisting late glacial outlets at Chicago and Port Huron, Michigan. Incision of the Port Huron outlet about B. P. Caused the levels of the lakes to drop to those of the subsequent Algoma stage; the Chicago outlet was abandoned. Renewed incision of the Port Huron outlet about B. P. Caused a final drop to the present level of Lakes Michigan and Huron. Results of the present study provide for a more detailed interpretation of these changes and indicate that conspicuous fluctuations of Lake Michi gan have occurred during the past years - a period previously recog nized as one of relatively stable levels. The Nipissing and the Algoma stages of the lakes have been defined here as high fluctuations of Lake Michigan separated by subsequent periods of low lake level. An earl y Nipissing stage fluctuation (nipissing attained an altitude of 783 m about b.p. A second Nipissing stage fluctuation (nipissing ll} reached an altitude of m about B. P. Temporal agreement with Holocene neog/acial and pollen records suggests that the Holocene levels of Lakes Michigan and Huron were climatically related to changes in water volume in these lake basins. Such fluctuations appear to have been superimposed on the dif feren tia/ isostatic uplift of the region and suggest that Nipissing and Algoma stage levels could not have been controlled solely by episodic incision of the outlet channel at Port Huron. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Curtis E. Larsen
Publisher:
ISBN:
Category : Beach ridges
Languages : en
Pages : 36
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Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 392
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Author:
Publisher:
ISBN:
Category : Environmental management
Languages : en
Pages : 178
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Author: Larry E. Parson
Publisher:
ISBN:
Category : Beach nourishment
Languages : en
Pages : 112
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Book Description
A monitoring program to evaluate the effects of beach nourishment material placed on a cohesive shoreline in southeast Lake Michigan was conducted at St. Joseph, MI, by the U.S. Army Engineer Waterways Experiment Station. In conjunction with this monitoring program, this particular study focuses on a 6-km (3.7-mile) section of shoreline extending southward from the jetties of St. Joseph Harbor. Some of the geological variables that affect cohesive shores were investigated. The primary objective of the study was to develop an improved understanding of the relationship between the movement of the cohesionless sediment (both fine and coarse grain components) and the irreversible downcutting of the underlying glacial till at the St. Joseph project site. Data collected during the monitoring program were input into a 2-D numerical model to describe the cross-shore sediment process and to predict the profile response to storm conditions with the influence of the underlying glacial till represented as an erosion-resistant sublayer. The 2-D profile change tests were performed at 10 of the profile locations.
Author: Olive W. Baganz
Publisher: AAPG
ISBN: 0891813772
Category : Science
Languages : en
Pages : 526
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Book Description
Many publications on lacustrine systems concentrate on reconstructing paleo-environments, deciphering paleoclimate or estimating hydrocarbon source potential. This is the first memoir to give attention to describing the occurrence, distribution and character of sandstones in various lake settings. The memoir is divided into four sections beginning with a global overview, and followed by two sections covering lacustrine systems in compressional and extensional regimes, and concludes with a series of papers on modern lake regimes.
Author: Gregory S. Baker
Publisher: Geological Society of America
ISBN: 0813724325
Category : Science
Languages : en
Pages : 192
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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 876
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Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 450
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