B Balanced Rock, 99 Basalt, 71 Basins, 61, _62_, 63 Battlement Mesa, lava flows, 21, 63, 64, _71_ views, 30, 33 Beard, Irving, 12 Bentonite, 49 Black Canyon of the Gunnison National Monument, 38, 128 Black Ridge, 53, 55 Black Ridge Trail, _99_ Book Cliffs, _18_, 56, 73 coal, 60 views, 30, 33, _57_, 100 Book Cliffs View, 102, 104 _Brachiosaurus_, 50 _altithorax_, 91 monument, Riggs Hill, 90 Broadway, 86, 89, _92_-95 Brown-Stanton river expedition, 11 Brushy Basin Member, Morrison Formation, 47, 90, 96 bentonite, 49 views, _48_, _95_ Bryce Canyon National Park, 63, 130 Buffalo, 3, 91, 94, 105 Burro Canyon Formation, 53, 55, 90, 96, 118 unconformity, 118 views, 48, _54_ water, 15