The hundreds of millions of years of history folded within Pennsylvania's rocks tell a remarkable story of destruction, creation, and transformation. With an assortment of maps, diagrams, photos, and expert descriptions, Roadside Geology of Pennsylvania is the ultimate travel companion for those who have little or no training in geology.
Bradford Van Diver expertly guides the traveler through the wonders of Pennsylvania's complex geology seen from the road. Like a lively storyteller, Van Diver keeps jargon to a minimum and translates intricate geological processes into basic explanations so you can understand the events that shaped the landscape of Pennsylvania.
Highly useful even for those who are just passing through, this guide makes the science behind this state's geology more accessible than ever. Roadside Geology of Pennsylvania has a place in the library of those who are interested in understanding and seeing firsthand the forces that have shaped the Keystone State.
Preface iii
Getting Started 1
Rocks - Fossils of Time 1
The Pennsylvania Landscape 11
Pennsylvania and the Ice Age 16
Plate Tectonics 23
Oil and Gas 35
Coal 39
I. Allegheny Plateau 45
I-70: West Virginia Border - New Stanton 49
I-76: Ohio Border - Somerset 53
I-79: West Virginia Border - Zelienople 59
I-79: Zelienople - Erie 69
I-80: Ohio Border - Brookville 77
I-80: Brookville - Bellefonte 81
I-81: Wilkes-Barre - New York Border 89
I-84: Matamoras - I-380 Interchange 95
I-90: Ohio Border - New York Border 99
US 6: Scranton - Mansfield 105
US 6: Mansfield - Lantz Corners 113
US 6: Lantz Corners - Meadville 119
US 15: Williamsport - New York Border 127
US 62: Franklin - Junction US 6 131
US 219: Bradford - McGees Mills 139
US 219: McGees Mills - Maryland Border 145
US 220: South Waverly - Williamsport 149
II. Valley and Ridge Province 159
I-70: Breezewood - Warfordburg 163
I-76: Somerset - Carlisle 167
I-80: Bellefonte - Bloomsburg 179
I-80: Bloomsburg - Delaware Water Gap 183
I-81: Junction I-78 - Wilkes-Barre 197
I-380: Scranton - Crescent Lake 209
US 15: Amity Hall - Williamsport 215
US 209: Matamoras - Delaware Water Gap 221
US 209: Stroudsburg - Jim Thorpe 227
US 220: Williamsport - Port Matilda 233
US 322: Amity Hall - Martha Furnace 247
PA 61: Sunbury - Frackville 253
III. Southeastern Pennsylvania 259
I-76: Carlisle - Philadelphia 261
I-78: Junction I-81 - Allentown 275
I-81: Maryland Border - Junction I-78 279
I-83: Maryland Border - Junction I-76 291
US 15: Maryland Border - Amity Hall 295
US 30: Breezewood - Gettysburg 303
US 30: Gettysburg - Lancaster 311
US 222: Lancaster - Allentown 317
PA 9: Philadelphia - Junction I-80 320
Glossary 330
References 337
Index 340
Bradford B. Van Diver (1927-2002), was professor emeritus of Geology at SUNY, Potsdam. He began a history of rock climbing while studying at the University of Colorado and later he earned his PhD from the University of Washington. He taught at a number of institutions and was a member of several associations, including the Adirondack Mountain Club, the Colorado Hiking Club, and the Carolina Mountain Club. Van Diver was an avid mountaineer, hiker, photographer, woodworker, kayaker, skier, and world traveler.