| Preface | p. vii |
| Introduction to Ohio's Geology | p. 1 |
| A Geologic Calendar | p. 1 |
| Plate Tectonics and Ohio's Origins | p. 2 |
| Ohio's Basement | p. 4 |
| Paleozoic Time | p. 5 |
| North American Mountain-Building Events | p. 5 |
| The Ordovician World | p. 7 |
| The Silurian World | p. 7 |
| The Devonian World | p. 8 |
| The Mississippian, Pennsylvanian, and Permian Worlds | p. 9 |
| The Missing Record | p. 11 |
| Arches and Sedimentary Basins | p. 11 |
| The Pleistocene Ice Age | p. 12 |
| Glacial Erosion and Deposition | p. 14 |
| Windblown Sediments | p. 16 |
| Record in the Rocks | p. 17 |
| Common Ohio Fossils | p. 19 |
| Rocks as Resources | p. 22 |
| Sand and Gravel | p. 24 |
| Ohio's Common Minerals | p. 24 |
| Other Notable Geologic Features | p. 27 |
| Groundwater and Karst | p. 27 |
| Rivers and Streams | p. 29 |
| Flooding Rivers and Flash Floods | p. 30 |
| Slides and Slumps | p. 31 |
| Western Ohio-The Till Plains | p. 35 |
| Ordovician Formations | p. 35 |
| Silurian Formations | p. 40 |
| Devonian Formations | p. 45 |
| The Pleistocene Ice Age | p. 48 |
| The Great Black Swamp | p. 50 |
| Lima-Indiana Oil and Gas Field | p. 52 |
| The Stone Industry | p. 53 |
| Road Guides | |
| I-70 and U.S. 40: Buckeye Lake-Indiana Line | p. 54 |
| I-71: Columbus-Cincinnati | p. 58 |
| I-75: Toledo-Cincinnati | p. 63 |
| I-80/90 (Ohio Turnpike) and U.S. 20: Toledo-Indiana Line | p. 78 |
| U.S. 23: Toledo-Chillicothe | p. 83 |
| U.S. 24: Toledo-Indiana Line | p. 99 |
| U.S. 30 and U.S. 224: Crestline and Willard-Indiana Line | p. 104 |
| U.S. 50: Chillicothe-Indiana Line | p. 110 |
| U.S. 68: Findlay-Aberdeen | p. 120 |
| U.S. 127: Michigan Line-Cincinnati | p. 136 |
| Ohio 32: Peebles-Cincinnati | p. 143 |
| Ohio Uplands-The Allegheny Plateau | p. 149 |
| Devonian and Mississippian Formations | p. 150 |
| Pennsylvanian Formations | p. 153 |
| Coal Formation | p. 158 |
| Permian Formations | p. 158 |
| Coal Mining | p. 160 |
| The Clay Industry | p. 162 |
| The Pleistocene Ice Age | p. 163 |
| The Teays Drainage | p. 164 |
| Road Guides | |
| I-70 and U.S. 40: Bridgeport-Buckeye Lake | p. 166 |
| I-71: Cleveland-Columbus | p. 185 |
| I-77: Cleveland-Marietta | p. 198 |
| I-80 and U.S. 422: Pennsylvania Line-Cleveland | p. 217 |
| U.S. 23: Chillicothe-Portsmouth | p. 227 |
| U.S. 30 and U.S. 224/I-76: East Liverpool and the Pennsylvania Line-Crestline and Willard | p. 231 |
| U.S. 33: Columbus-Pomeroy | p. 249 |
| U.S. 50: Coolville-Chillicothe | p. 273 |
| U.S. 250: Sandusky-The Ohio River | p. 277 |
| Ohio 11: Ashtabula-East Liverpool | p. 285 |
| Ohio 32: Albany-Peebles | p. 297 |
| Lakeshore Ohio | p. 304 |
| History of Lake Erie | p. 304 |
| Lake Erie Basins | p. 308 |
| Shoreline Dynamics | p. 308 |
| Road Guides | |
| I-90 and U.S. 20 (Including I-80 between Elyria and Toledo): Pennsylvania Line-Toledo | p. 313 |
| The Ohio Valley-A Product of the Ice Age | p. 342 |
| History of the Ohio River | p. 343 |
| Notable Floods | p. 346 |
| Road Guides | |
| U.S. 52: Sybene-Indiana Line | p. 348 |
| Ohio 7: East Liverpool-Chesapeake | p. 363 |
| Glossary | p. 380 |
| Additional Reading | p. 387 |
| Index | p. 390 |
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