Table of Contents
Bedrock Geology Map of Mount Desert Island ii
List of Figures x
List of Tables xv
Acknowledgments xvii
Foreword xix
Preface xxiii
A Synopsis of the Geologic Story of Mount Desert Island (MDI) xxv
Basic Geologic Concepts 1
The Three Types of Rocks 1
Igneous Rocks 1
Metamorphic Rocks 11
Sedimentary Rocks 13
The Rock Cycle 15
Formation of Planar Fractures or Joints in the Rock 18
Geologic Time 20
Plate Tectonics 23
Erosion Processes That Shape the Landscape-Streams 27
Erosion Processes That Shape the Landscape-Glaciation 29
Global Glaciation Throughout Geologic Time 29
How Glaciers Move and Sculpt the Landscape 30
Crust Downwarp and Rebound from Ice Weight 33
Deposits Left during or Just after Glaciation 34
MDI Geologic History 37
Geologic Events Prior to MDI Becoming a Large Volcanic Caldera 37
When MDI Was a Large Volcanic Caldera 41
Later Paleozoic Plate Collisions and Mesozoic Breakup 51
Mesozoic and Cenozoic Stream Erosion 52
Quaternary Glaciation-The Final Sculpting of the Landscape 54
Self-Guided Field Trips 65
Introduction 65
Trip A Acadia National Park Loop Road 68
A1 Cadillac Summit Road 68
A2 Cadillac Summit 72
A3 Frenchman Bay (Champlain Mountain) Overlook 77
A4 Sand Beach 80
A5 Thunder Hole 85
A6 Monument Cove 89
A7 Otter Cliff 92
A8 Otter Point 95
A9 Otter Cove Causeway 99
A10 Little Hunters Beach 102
A11 Jordan Pond 106
Trip B Sites on the Northern and Eastern Side of MDI 109
B1 Thompson Island Picnic Area 109
B2 Hadley Point 112
B3 Bar Harbor Shore Path 115
B4 The Tarn 121
B5 Hunters Beach 125
B6 Seal Harbor Beach 128
B7 Sargeant Drive/Somes Sound Viewpoint 131
B8 Suminsby Park on Somes Sound 134
B9 Eagle Lake Boat Launch 137
Trip C Western Side of MDI Starting from Somesville 140
C1 Echo Lake Boat Launch at Ikes Point 140
C2 Echo Lake Beach 144
C3 Long Pond or Great Long Pond Boat Launch 147
C4 Natural Seawall Seawall Pond Roadside Pull-Over 150
C5 Seawall Picnic Area 157
C6 Ship Harbor Nature Trail 160
C7 Bass Harbor Head 163
C8 Seal Cove Boat Landing 167
C9 Pretty Marsh Picnic Area 171
C10 Beech Cliff Viewpoint 176
C11 Maine Granite Industry Museum 180
Visualization Exercise through Time and Space #1: From When MDI Was an Erupting Volcano to the Present 183
Visualization Exercise through Time and Space #2: Glacial Advance and Retreat 187
References 191
Selected Readings 192
Index 193
About the Authors 203
Surficial Geology Map of Mount Desert Island 205