Geological Survey Professional Paper Volume 521, PT. 3

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. Excerpt: ...Joseph City (pi. 2 and fig. 4). Water wells near Leupp penetrated between 160 and 120 feet of Kaibab. One oil test in the western part of the Hopi Indian Reservation penetrated about 35 feet of Kaibab Limestone, but limestone was not recognized in the other wells drilled east of this test in Black Mesa basin (H. W. Peirce, oral commun., 1968). The Kaibab Limestone unconformably overlies the Toroweap Formation in Marble Canyon, in the canyon of the Little Colorado River, and at Grand Falls. Evidence supporting the unconformity, as established by McKee (1938, p. 28-35), is the local occurrence of a conglomerate at the top of the Toroweap Formation, deposition of the Kaibab Limestone around "mounds" of the gnarly bedded Toroweap sediments, and the truncation of the upper wavy sandstone beds of the Toroweap Formation prior to deposition of the flat-lying basal limestone of the Kaibab. The Kaibab Limestone has been fractured extensively by jointing and faulting. In places, the resulting cracks have been enlarged by solution, are nearly 5 feet wide, and penetrate through the formation. These cracks intercept runoff and act as conduits for the downward movement of water from the surface to the Coconino Sandstone. Only a few wells have been completed in the Kaibab, because in most of the reservations where it crops out or is at shallow depth, the regional water table is in the underlying Coconino Sandstone. BETA MEMBER The Beta Member of the Kaibab Limestone consists of thick-to thin-bedded limy sandstone and sandy magnesian limestone. The sandstone ranges from yellowish gray (57 7/2) to very pale orange (10YR 8/2)) on a fresh surface and weathers to yellowish gray (5Y 7/2) and light gray (AT 7). It is composed mainly of medium to very fine rounded...