Roadside Geology of TexasTable of Contents | |
| I. The Big Picture | 1 |
| Geologic Time | 1 |
| A March Through Geologic Time | 3 |
| Introduction to the Geology of Texas | 11 |
| Other Effects of Geology | 21 |
| Why So Much Oil in Texas | 26 |
| II. The Gulf Coast: Salt Domes, Rivers, Beaches, Dunes and Barrier Islands | 35 |
| Meandering Rivers | 38 |
| Geologic History of the Texas Barrier Islands | 41 |
| Longshore Drift | 44 |
| Hurricanes Along the Texas Coast | 47 |
| Salt Domes | 49 |
| Southeast Texas: Upper Gulf Coast | 55 |
| Interstate 10: Houston - San Antonio | 55 |
| Interstate 10: Houston - Beaumont - Orange | 57 |
| Interstate 35: Temple - Austin - San Marcos | 60 |
| Austin | 63 |
| Interstate 45: Houston - Galveston | 67 |
| Interstate 45: Houston - Centerville | 78 |
| US 59: Houston - Victoria | 79 |
| US 59: Houston - Lufkin | 79 |
| US 290: Houston - Brenham - Austin | 80 |
| Texas 36: Richmond / Rosenberg - Damon Mound - Freeport | 82 |
| Southwest Texas: Lower Gulf Coast | 85 |
| Interstate 35: San Marcos - San Antonio | 85 |
| San Antonio | 87 |
| Interstate 35: San Antonio - Laredo | 91 |
| Interstate 37: Corpus Christi - San Antonio | 93 |
| US 59: Victoria - Goliad - Beeville - I-37 | 95 |
| US 77-83: Brownsville - Corpus Christi | 96 |
| Padre Island National Seashore | 98 |
| Rockport / Fulton and Aransas National Wildlife Refuge | 101 |
| US 83: Laredo - Harlingen | 104 |
| Texas 100, 48: Port Isabel and South Padre Island | 107 |
| III. Central Texas: Hill Country, Caves, and Plateaus | 113 |
| Interstate 10: San Antonio - Kerrville - Bakersfield | 125 |
| US 87: Comfort - Fredericksburg | 129 |
| US 87: Fredericksburg - Mason | 131 |
| US 87: Mason - Brady | 132 |
| US 90: Uvalde - Del Rio | 137 |
| US 90: Del Rio - Langtry - Sanderson | 138 |
| US 183: Lampasas - Austin | 146 |
| US 281: Marble Falls - Johnson City | 147 |
| US 281: Johnson City - Blanco | 149 |
| US 290: Austin - Johnson City - Fredericksburg - I-10 | 150 |
| Texas 16: Kerrville - Fredericksburg | 152 |
| Texas 16: Fredericksburg - Llano | 153 |
| Texas 16: Llano - San Saba | 154 |
| Texas 29: Llano - Mason | 156 |
| Texas 29: Llano - Buchanan Dam - Burnet | 158 |
| Texas 46: New Braunfels - Boerne | 161 |
| Farm Road 965: Fredericksburg - Enchanted Rock State Park - Texas 16 | 162 |
| Enchanted Rock State Park | 164 |
| Park 4, Farm Road 2342, Farm Road 1431: Buchanan Dam - Inks Lake State Park - Longhorn Cavern State Park - Marble Falls | 170 |
| Farm Road 2766: Johnson City - Pedernales Falls State Park | 176 |
| Hill County Drives: Kerrville - Bandera - Lost Maples and Garner State Parks | 179 |
| IV. Northeast Texas: Lignite and Piney Woods | 185 |
| Interstate 20 and 635: South of Dallas - Fort Worth | 189 |
| Interstate 20: Dallas - Marshall | 193 |
| Interstate 30: Dallas - Texarkana | 196 |
| Interstate 35E: Denton - Dallas | 198 |
| Interstate 35 and 35W: Fort Worth - Waco - Temple | 198 |
| Interstate 45: Dallas - Corsicana - Centerville | 199 |
| Interstate 820 and 35W: Fort Worth - Gainesville - Red River | 201 |
| US 59: Texarkana (I-30) - Marshall (1-20) | 204 |
| US 59 - 259: Lufkin - Nacogdoches - Kilgore | 205 |
| V. Northcentral Texas: Red Beds and Dinosaur Tracks | 211 |
| Interstate 20: Roscoe - Abilene - Fort Worth | 214 |
| US 84: Coleman - Abilene | 219 |
| US 84 - 183: Coleman - Brownwood - Lampass | 223 |
| US 180 - Texas 16 Loop: Weatherford - Mineral Wells - Possum Kingdom Lake | 225 |
| US 283: Brady - Coleman | 235 |
| US 287: Childress - Wichita Falls - Fort Worth | 237 |
| US 377, Texas 144, Farm Road 205: Fort Worth - Granbury - Glen Rose - Dinosaur Valley State Park | 241 |
| Dinosaur Valley State Park | 245 |
| VI. West Texas: Mountain Country | 255 |
| Interstate 10: Bakersfield - Fort Stockton - Van Horn - El Paso - New Mexico Border | 259 |
| Interstate 20: Monahans - Pecos - Interstate 10 | 266 |
| US 62 - 180: El Paso - Guadalupe Mountains National Park - New Mexico Border | 267 |
| US 90: Marfa - Alpine | 271 |
| US 90: Sanderson - Marathon - Alpine | 276 |
| US 285: Fort Stockton - Pecos - New Mexico Border | 283 |
| US 385: Marathon - Big Bend National Park | 289 |
| Big Bend National Park | 291 |
| The North Road: Persimmon Gap - Panther Junction | 298 |
| The East Road: Panther Junction - Boquillas Canyon | 303 |
| The Basin Road: Main Highway - The Basin on Park Route 4 | 308 |
| The West Road: Panther Junction - West Park Boundary and Study Butte | 312 |
| Maxwell Drive: West Road - Castolon and Santa Elena Canyon | 315 |
| Texas 17: Fort Davis - Marfa | 321 |
| Texas 54: Van Horn - US 62-180 - Guadalupe Mountains National Park | 322 |
| Guadalupe Mountains National Park | 325 |
| Texas 118: Study Butte - Alpine | 329 |
| Texas 118: Alpine - Fort Davis | 334 |
| Texas 118: Fort Davis - Kent (I-10) | 336 |
| Texas 170: Study Butte - Terlingua - Lajitas - Presidio | 344 |
| VII. Northwest Texas: The Panhandle - High Plains | 355 |
| Interstate 20: Monahans - Odessa - Midland - Big Spring - Rosco | 359 |
| Monahans Sandhills State Park | 361 |
| Odessa Meteor Crater | 366 |
| Interstate 40: Oklahoma - Amarillo - New Mexico | 367 |
| US 84: New Mexico - Farwell - Lubbock - Post - Snyder - Roscoe - I-20 | 369 |
| US 287: Amarillo - Childress | 370 |
| Texas 18: Monahans - Kermit - New Mexico State Line | 371 |
| Texas 86, 256, 207: Tulia - Silverton - Claude - Quitaque - Turkey | 372 |
| Caprock Canyons State Park | 375 |
| Texas 136: Amarillo - Alibates Flint Quarries National Monument | 376 |
| Alibates Flint Quarries National Monument | 377 |
| Texas 217: Canyon - Palo Duro Canyon State Park | 378 |
| Palo Duro Canyon State Park | 379 |
| Texas 349, US 87, Interstate 27: Midland - Lamesa - Lubbock - Plainview - Canyon - Amarillo | 386 |
| Maps and Information | 388 |
| Credits | 390 |
| Glossary | 397 |
| Index | 409 |
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