WIND-BLOWN SAND. COCONINO FORMATION. GRAND CANYON
TRACKS OF PRIMITIVE FOUR-FOOTED ANIMALS, COCONINO SANDSTONE. GRAND CANYON PHOTO BY E. W. ENSOR
WARM SEAS FROM THE WEST—THE TOROWEAP AND KAIBAB FORMATIONS
(PERMIAN PERIOD)
SEASHELLS FROM KAIBAB LIMESTONE (REDUCED)
Along both sides of Grand Canyon at the top, two buff and gray layers of limestone stand out as massive cliffs separated by a tree-covered slope. The upper of these limestones forms the plateau surface and may be seen for a great distance in every direction. Both layers were formed as the result of vast accumulations of organic and sandy materials on sea bottoms, and in places are composed largely of the remains of marine life—shells, corals and sponges. The teeth of sharks have also been found in the upper limestone.
SEA LILY OR CRINOID (REDUCED)
