The Supai Group, consisting of deep-red siltstone, limestone, and sandstone, is 600 to 700 ft thick. Within these layers are marine fossils, including brachiopods, corals, crinoids, and gastropods.

75 x 45 cm. (29.5 x 17.7 in.) Subscribe now to view details for this work, and gain access to over 18 million auction results. Purchase One-Day Pass ...