COLORADO PLATEAU 



413 



GRAND CANYON 



COCONINO PLATEAU 



COCONINO 



PLATEAU 



CNANOVif* SCCTION 



Of thc cast kaibab monocline 



GRAND CANYON "" ' A,SAB 



ocscit view sccrioii 



UONOCLIHC 



CCDAR HCSA 

 CCOM K£Si 



2 ~^-— 



Or ~r~^_ 

 Cbo "l^^ 

 cT^^-h 



Pre- C p^ 



sccno* 



M4R8LC 







-^^^^:r^""-z~-^> ::.'-"-"'-- 



;:::::r::-"--- :: -" :iI - irrr "----- r "- Vc >yv____ 





■ T^nt^-— 



Cs 



■ ~ Cf_ 



■ ' Ct 



— ■♦■!- ~ 



Pre-C 









1 





— ; — ^^H-A- '!-, 









1 



i 





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1 







1 







1 



COCONINO PLATEAU 



SXIfcNER RiDCf. 



CHANOVICW SCCTION Of THC 

 CAST HA IB A a UONOCLINC 



UPPER 8ASIH 



WATCHUX) HILL SCCTION of 

 ThC CAST KAJBAB UONOCLPlC 



Fig. 26.8. Cross sections from north to sou'h of the Kaibab uplift and East Kaibab monocline. After Baben- 

 roth and Strahler, 1945. Cr, Redwall Is.; Cba, Bright Angel sh.; Ct, Tapeats ss. 



feet thick (Fig. 26.10). A great Eocene fresh-water lake was impounded 

 by the crustal movements around the Uinta arch, and in it the petro- 

 liferous strata of the Green River formations were depoisted. The Upper 

 Cretaceous and Lower Tertiary strata of die High Plateaus are very thick 

 (Chapter 22), and the Cretaceous of the San Juan basin is about 10,000 

 feet in maximum thickness (Fig. 26.11). 



The major monoclines displace the strata vertically 5000 to 8000 feet. 

 They die out gradually at the ends, and curve in toward the uplift. These 

 features have been taken to mean that the Precambrian basement was 

 upfaulted and that the flexible sedimentary beds were draped over the 

 faults ( Baker, 1935 ) . In places, the faults break through to die surface. 

 Small faults are numerous in the uplifts and basins. 



