Unearth the secrets of Texas's billion-year history with this captivating guide to 80 easily accessible geologic sites. With geology as diverse as the state, the sites include dinosaur tracks embedded in limestone, thick lava flows cut by vertical columns, sand dunes composed entirely of gypsum, and blue quartz crystals sparkling in llanite, an unusual rock found only in the Llano region. Beautiful color photographs complement the engaging discussion, and detailed maps guide you to sites hidden in deep canyons, forested hills, and urban parks. With this book in hand, explore mining districts and fossil reefs in the western mountains, dike-laced granite of Enchanted Rock, springs and caves along the Balcones Escarpment, salt domes and ever-changing barrier islands along the coastal plains, and the layered sedimentary rock of Palo Duro, Seminole, and Santa Elena Canyons.