Geology and Landscape of Michigan’s Pictured Rocks National Lakeshore and Vicinity

by Blewett, William L.

• ISBN13: 9780814334416
• ISBN10: 0814334415
• Format: Paperback
• Copyright: 2012-03-15
• Publisher: Wayne State Univ Pr

Summary

A field guide to the geology and scenery of northern Michigan's Pictured Rocks National Lakeshore.

Author Biography

William L. Blewett is professor and chair of the Georgaphy-Earth Science Department at Shippensburg University of Pennsylvania, where he teaches physical geology, geomorphology, and the geology of national parks. Prior to doctoral study, he was a researcher for National Geographic magazine in Washington, D.C.

Table of Contents

Preface	p. ix
Acknowledgments	p. xiii
Introduction and Regional Setting	p. 1
Introduction	p. 1
Access	p. 4
History and Mission of the Park	p. 6
Getting Started: The Geologic Time Scale and Pictured Rocks Stratigraphy	p. 9
Geologic Setting	p. 12
The Pictured Rocks Landscape	p. 14
Precambrian and Paleozoic Bedrock	p. 17
Overview and Previous Work	p. 17
Regional Correlation	p. 18
Jacobsville Formation	p. 19
Munising Formation	p. 21
The Pre-Munising Surface	p. 22
Basal Conglomerate Member	p. 23
Chapel Rock Member	p. 26
Origin of the Chapel Rock Member	p. 29
Miners Castle Member	p. 31
Au Train Formation	p. 33
Fossils in Pictured Rocks National Lakeshore	p. 35
Geologic History: Sequence of Events	p. 37
The Lost Interval	p. 42
Ancient Lakes and Relict Shorelines	p. 45
Introduction	p. 45
Getting Started	p. 46
Factors Affecting Lake Levels	p. 47
Crustal Rebound	p. 47
Ice-Marginal Retreat and Uncovering of Lower Outlets	p. 48
Shoreline Patterns-Rebound and the Bathtub Revisited	p. 50
Other Factors	p. 52
The Lake Sequence in the Lake Superior Basin	p. 53
Recognized Shorelines	p. 53
Sequence of Events	p. 54
The Modern Great Lakes	p. 57
Features Related to Ancient Lake Levels in Pictured Rocks National Lakeshore and Vicinity	p. 59
The Ice Age	p. 67
The Glacial Chronology	p. 67
A Glacier Primer	p. 69
Drift and Bedrock Surface Characteristics	p. 73
Bedrock Topography	p. 73
Drift Thickness	p. 73
Drift Characteristics	p. 74
Landforms	p. 74
Moraines, Outwash Plains, and Heads of Outwash	p. 74
Kingston Lake Kettle Chain	p. 76
Drumlins	p. 76
Kame Terraces	p. 79
Spillways between Lakes Superior and Michigan	p. 80
Previous Work	p. 80
Deglaciation History	p. 84
Discussions and Conclusions	p. 86
The Holocene Epoch	p. 89
Stream and Lake Networks	p. 89
Streams	p. 89
Lakes	p. 90
Initiation and Evolution of Grand Sable Dunes	p. 91
Previous Work	p. 92
The Curious History of Sable Creek, Grand Sable Lake, and Grand Sable Dunes	p. 95
The Pictured Rocks Cliffs	p. 98
Of Agates and Erratics	p. 103
The Human Imprint	p. 108
Native Americans	p. 108
The Sawmill Culture	p. 110
Sand Point: A Lesson in Geologic Complexity	p. 112
Appendix: Pictured Rocks Road Log	p. 117
Munising	p. 118
Munising Falls	p. 118
Memorial and Olsen Falls	p. 120
Miners Castle Area	p. 123
Miners Beach (east)	p. 125
Miners Beach (west)	p. 127
Chapel Beach Area	p. 132
Mosquito Beach Area	p. 135
Melstrand Esker	p. 138
Long Lake Channel	p. 139
Kingston Plains	p. 140
Kingston Lake Kettle Chain	p. 141
Hurricane River, Au Sable Point, and the Jacobsville Formation	p. 145
Log Slide and Grand Sable Banks and Dunes	p. 148
Grand Sable Lake	p. 150
Sable Fails Area	p. 151
Donahey Woods Site	p. 156
Grand Marais	p. 158
References Cited	p. 161
Index	p. 173
Table of Contents provided by Ingram. All Rights Reserved.