344 



STRUCTURAL GEOLOGY OF NORTH AMERICA 



PLATEAU 



SAN PETE VALLEY 



CASTLE VAL. 

 Ksp 



GUNNISON 



LONG RIDGE 



Fig. 22.18. Section from the Wasatch Plateau, west- 

 ward through the Gunnison Plateau, Canyon Range 

 (section 16, Fig. 22.1); Wasatch Plateau after Spieker, 

 1946; Gunnison Plateau after Spieker (1949); Canyon 

 Range after Christiansen (1952); House and Con- 

 fusion Range after unpublished map by Quigley er a/. 

 Tf, Flagstaff; Tnh, North Horn; Kpr, Price River; Kc, 

 Castle Gate member; Kbh, Blackhawk; Ksp, Star Point; 

 Ks, San Pete; Kav, Allen Valley; Kf, Funk Valley; 

 Ksx, Sixmile Canyon; Tc, Colton; Tgr, Green River; 

 Teh, Crazy Hollow; Tfc, Fool Creek (Oligocene; Ja, 

 Arapien sh.; Jm, Morrison (?); CIs, Cambrian Is.; Co, 

 Ophir sh.; Ct, Tintic quartzite. 



CONFU SION 



RANGE 



Cross sections of the Pine Valley Mountains and Hurricane Fault zone 

 in the southwestern corner of Utah are shown in Fig. 22.21. This area 

 is in the belt of moderate folding. We should note ( 1 ) that the porphyry 

 pluton of the Pine Valley Mountains was intruded as a laccolith between 

 the Claron conglomerate and the overlying ignimbrites in about mid- 

 Tertiary time; (2) the Claron lies across a truncated fold in which 



the latest Cretaceous Kaiparowits formation is involved; and (3) the 

 Hurricane fault developed after the ignimbrites were spread over the 

 country. The evolution as conceived by Cook (1957) is represented in 

 Fig. 22.22. 



The Hurricane fault is particularly impressive because of the deep 

 red color of some of the formations, the faulted black basalt flows, and 



