126 ENVIRONMENT OF VERTEBRATE LIFE, ETC. 



The three lots collected were examined by G. H. Girty, of the Survey, who 

 reports the following species: Amboccelia planiconvexa, crinoid stems, Productus? 

 sp., Chonetes aff. C. geinitzianus, which he says are 'probably Pennsylvanian, 

 though the faunas are too limited to be really diagnostic' 



'Red sandstones. — The red and brown sandstones and conglomerates form a 

 broad northward-lying belt along the central part of the eastern slope of the 

 mountains, being the prevailing rocks in the vicinity of Galena and showing in 

 great force in Copper Canyon and the ridge east of that canyon. As a rule the 

 eastward lower beds of this series are arenaceous shales and sandstones of light 

 red and yellow color. The lower central part of the series is conglomeratic. 

 The well-rounded pebbles are largely white quartzite and a dense red jasperoidal 

 material. They range from one-eighth to one-half inch in diameter, though a 

 few larger cobblestones occur. The matrix is a yellowish, red-weathering sand 

 of rather coarse texture. Interbedded with the conglomerates there are numerous 

 irregular, lenslike masses of red sandstone. In the upper part of this series the 

 material becomes fine grained, passing into dirty brown sandstones that contain 

 considerable mica. 



"White quartzite. — The ridge between Copper Canyon and Willow Creek, 

 at the southwest side of the mountains, is composed of a white vitreous fine- 

 grained quartzite, somewhat similar to the hill north of Cottonwood Canyon 

 in which the Little Giant vein occurs. At the former locality the beds dip 

 west at very steep angles and apparently have been faulted into their present 

 position. * * * 



"The two formations discussed above (the red sandstone and the white 

 quartzite) are presumably to be correlated with the Weber quartzite of the 

 Fortieth Parallel Survey reports." 



(/) Conditions in Utah. — From the region east and northeast, the same 

 horizon can be traced through the Canyon Range and Oquirrh Range 

 south of the Great Salt Lake as the Bingham quartzite to the Uintah and 

 Wasatch Mountains. Loughlin^ says: 



"The quartzite as a rule is of fine, even grain and varies in color from nearly 

 white to light and dark brown or reddish brown. Some of its beds are greenish. 

 Its general appearance is very similar to that of the thick Cambrian quartzite ex- 

 posed in the Tintic district and at several places along the Wasatch Range. * * * 



"The quartzite contains a conspicuous and persistent dark-reddish finely 

 banded member, 400 or 500 feet thick, which is a convenient horizon marker 

 and indicator of the geologic structure. * * * One lens of gray limestone * * * 

 was noted on the north side of Fool Creek canyon. Detailed study may prove 

 the presence of several such lenses. * * * 



"No fossils were found in the quartzite, but its apparent conformable position 

 above limestone of Madison age suggests that its lower part at least is Missis- 

 sippian. Its upper part may be Pennsylvanian. A similar quartzite of great 

 thickness, containing some limestone beds, forms the greater part of the West 

 Tintic Mountains, the southern end of which is almost connected with the north- 

 west end of the Canyon Range, and the writer has found upper Mississippian 



> Loughlin, G. P., A Reconnaissance in the Canyon Range, West Central Utah, U. S. Geo- 

 logical Survey, Professional Paper No. 90, p. 54, 1914- 



