340 



STRUCTURAL GEOLOGY OF NORTH AMERICA 



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FRONTAL WASATCH MTS. 

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OGDEN VALLEY 



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GREAT SALT LAKE VALLEY 



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FRONTAL WASATCH MT3. 



Morgan Valley 



DURST MOUNTAIN 

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COALVILLE! ANTICLINE 



Fig. 22.14. Cross sections of the north-central Wasatch Mountains, after Eardley, 1944. A— A', 

 an east-west section just south of Ogden Canyon extending from the Great Salt Lake to Ogden 

 Valley and beyond (section 6). B— B', a north-south section in the range from the north to the 

 south side of Ogden Canyon. The section terminates in the Great Salt Lake Valley because the 

 mountain front veers to the east of this place (section 7). This shows the crossfolding of the 

 Taylor and Ogden thrust sheets. C— C, an east-west section from the Great Salt Lake Valley to 

 Durst Mountain about midway between Salt Lake City and Ogden (section 9). Formation; pCf, 



Farmington Canyon complex; pCp, Proterozoic strata; Ct, Tintic quartzite; Cos, Ophir shale; €1, 

 €lu, €11, Cambrian limestone, upper and lower divisions; Drf, Three Forks (?) formation; Mn, 

 Madison limestone; Mb, Brazer formation; Pm, Morgan sandstone; Pw, Weber quartzite; tw, 

 Woodside shale; Tit, Thaynes limestone; Tia, Ankareh formation; Jn, Nugget sandstone; Je, 

 Entrada sandstone; Jte, Twin Creek formation; Kk, Kelvin formation; Ka, Aspen fm.; Kf, Frontier 

 formation; Kw, Wanship fm.; Tk, Knight formation; Tn, Norwood tuff (latest Oligocene, now same 

 as Fowkes). 



tains boulders at least as old as the Gardison (Madison) Formation. Between 

 Dry Creek and Crandall Canyons the conglomerate rests variously upon late 

 Jurassic, Early Cretaceous and older late Cretaceous strata and lies undisturbed 

 across two post-Carlile faults. Thus, a marked though perhaps localized tectonic 

 disturbance is indicated (Williams and Madsen, 1959). 



The faulting and folding of post-Frontier and pre-Wanship time are 

 part of the Cedar Hills orogeny which centered farther south. At first 

 they were thought to mark an early uplift of the northwest end of the 

 Uinta Mountains, but when one isopachs the formations of Colorado age 



