_Page_ Colorado’s three geologic provinces 2 Pikes Peak, seen from the Garden of the Gods 4 Rock classification (chart) 5 Stratigraphic column (chart) 7 Jurassic rocks in Colorado (map) 9 East face of Longs Peak 11 Rocky Mountain National Park (east-west profile) 12 Big Thompson Canyon, west of Loveland 13 Red Rocks Amphitheater, west of Denver 14 Colorado Springs area (map and cross section) 15 Joint systems in Precambrian rocks, Boulder Canyon 15 Spanish Peaks, southwest of Walsenburg 18 Hahn’s Peak, north of Steamboat Springs 19 Gore Range from the east 20 Aspen Mountain geology (map) 23 Mt. Sopris, south of Glenwood Springs 24 Ouray, in the San Juan Mountains 25 Steamboat Rock, Dinosaur National Monument 27 Grand Hogback, near Rifle (block diagram) 28 Mt. Garfield, near Grand Junction 30 Precambrian-Cambrian unconformity south of Ouray 34 Geologic map of Colorado 35 Black Canyon of the Gunnison National Monument 36 Precambrian-Cambrian unconformity, Glenwood Canyon 38 Cambrian fossils 39 Ordovician fossils 41 Devonian fossils 43 Mississippian fossils 44 Pennsylvanian paleogeography (map) 45 Fountain Formation northwest of Denver 45 Pennsylvanian fossils 46 Contorted Pennsylvanian rocks near Gypsum 46 Balanced Rock, Garden of the Gods 48 Permian reptile tracks 49 The Flatirons, near Boulder 50 Colorado National Monument 51 Morrison Formation, west of Denver 53 Dinosaur bones, found near Morrison 54 Dakota Sandstone hogback 56