Geology and landscape of Michigan's Pictured Rocks National Lakeshore and vicinity / William L. Blewett.

Format:

Book

Author/Creator:

Blewett, William L., 1959-

Series:

Great Lakes books.

Great Lakes books

Language:

English

Subjects (All):

Geology, Structural--Michigan--Pictured Rocks National Lakeshore.

Geology, Structural.

Glaciology--Michigan--Pictured Rocks National Lakeshore.

Glaciology.

Paleogeography--Pleistocene.

Paleogeography.

Paleogeography--Holocene.

Geology, Stratigraphic--Pleistocene--Michigan--Pictured Rocks National Lakeshore.

Geology, Stratigraphic.

Geology, Stratigraphic--Holocene--Michigan--Pictured Rocks National Lakeshore.

Pictured Rocks National Lakeshore (Mich.).

Physical Description:

1 online resource (200 p.)

Edition:

1st ed.

Place of Publication:

Detroit : Wayne State University Press, c2012.

Language Note:

English

Summary:

Michigan's Pictured Rocks National Lakeshore was established in 1966 to preserve one of the most exquisite freshwater coastal landscapes in North America. Located between Munising and Grand Marais on Lake Superior, the rugged coastline is anchored by the Pictured Rocks cliffs-soaring sandstone fortresses awash with natural pink, green, and brown pigments. While the Pictured Rocks' geologic history is generally well understood by scientists, much of this information is scattered among different sources and not easily accessible to general readers. In Geology and Landscape of Michigan's Pictured Rocks National Lakeshore and Vicinity, William L. Blewett synthesizes published and unpublished information on the park's geologic history and combines it with vivid color photographs, detailed maps, and diagrams of the area. Blewett examines the history and geology of the very ancient Precambrian, Cambrian, and Ordovician components of the Pictured Rocks dating back hundreds of millions of years, as well as the much younger unconsolidated Pleistocene (ice age) and Holocene (warm period since the ice age, including the modern landscape) sediments mantling the bedrock, most of which are no older than 12,000 years. He also details the history of the Lake Superior basin, tracing the events that shaped the modern shoreline from ancient times. For visitors to Pictured Rocks National Lakeshore, Blewett has provided a detailed mileage-referenced road log to guide readers to the best and most accessible field sites, and, for the more adventurous, includes a day hike keyed to the geology. A comprehensive bibliography and index are also included at the end of the book for further research. While it assumes an understanding of basic geologic principles, the volume is very readable and suitable for students, interested park visitors, and geologists, physical geographers, and those working in closely related fields such as archaeology, biology, ecology, and environmental science.

Contents:

Cover

Series Page

Title Page

Copyright

Contents

Preface

Acknowledgments

1. Introduction and Regional Setting

Introduction

Access

History and Mission of the Park

Getting Started: The Geologic Time Scale and Pictured Rocks Stratigraphy

Geologic Setting

The Pictured Rocks Landscape

2. Precambrian and Paleozoic Bedrock

Overview and Previous Work

Regional Correlation

Jacobsville Formation

Munising Formation

The Pre-Munising Surface

Basal Conglomerate Member

Chapel Rock Member

Origin of the Chapel Rock Member

Miners Castle Member

Au Train Formation

Fossils in Pictured Rocks National Lakeshore

Geologic History: Sequence of Events

The Lost Interval

3. Ancient Lakes and Relict Shorelines

Getting Started

Factors Affecting Lake Levels

Crustal Rebound

Ice-Marginal Retreat and Uncovering of Lower Outlets

Shoreline Patterns-Rebound and the Bathtub Revisited

Other Factors

The Lake Sequence in the Lake Superior Basin

Recognized Shorelines

Sequence of Events

The Modern Great Lakes

Features Related to Ancient Lake Levels in Pictured Rocks National Lakeshore and Vicinity

4. The Ice Age

The Glacial Chronology

A Glacier Primer

Drift and Bedrock Surface Characteristics

Bedrock Topography

Drift Thickness

Drift Characteristics

Landforms

Moraines, Outwash Plains, and Heads of Outwash

Kingston Lake Kettle Chain

Drumlins

Kame Terraces

Spillways between Lakes Superior and Michigan

Previous Work

Deglaciation History

Discussions and Conclusions

5. The Holocene Epoch

Stream and Lake Networks

Streams

Lakes

Initiation and Evolution of Grand Sable Dunes

The Curious History of Sable Creek, Grand Sable Lake, and Grand Sable Dunes

The Pictured Rocks Cliffs.

Of Agates and Erratics

The Human Imprint

Native Americans

The Sawmill Culture

Sand Point: A Lesson in Geologic Complexity

Appendix: Pictured Rocks Road Log

Munising

Munising Falls

Memorial and Olsen Falls

Miners Castle Area

Miners Beach (east)

Miners Beach (west)

Chapel Beach Area

Mosquito Beach Area

Melstrand Esker

Long Lake Channel

Kingston Plains

Hurricane River, Au Sable Point, and the Jacobsville Formation

Log Slide and Grand Sable Banks and Dunes

Grand Sable Lake

Sable Falls Area

Donahey Woods Site

Grand Marais

References Cited

Index.

Notes:

Bibliographic Level Mode of Issuance: Monograph

Includes bibliographical references and index.

ISBN:

0-8143-3616-7

OCLC:

778463102