262 



STRUCTURAL GEOLOGY OF NORTH AMERICA 



These movements were the beginning of thrusting, at least in the area of 

 former deposition. Later compression resulted in thrusting on a large 

 scale, and the earlier structures were greatly complicated. The thrusting 

 postdates the Dunlap Lower Jurassic formation, and precedes the in- 



EUROPEAN 

 STAGES 



MAESTR1CHTIAN 



CENOMANIAN 



HAUTERIVIAN 



VALANGINIAN 



BERRlASIAN 



(TITHONIAN) 

 PORTLANDIAN 



KIMMERIDGIAN 



I 



WEST SIDE 

 SACRAMENTO 

 VALLEY AND 

 COAST RANGES 



MORENO 

 FM 



Ws<" 





MORSE- 

 TOWN 



U.S KNOKVILLE 



EAST- 

 CENTRAL 

 CALIFORNIA 



MARIPOSA 

 SLATE 



AMADOR 

 GR 



EASTERN 



CALIFORNIA 



WESTERN 



NEVADA 



EXCELSIOR 



FM 



(VOLCANICS) 



CANOELARIA 



SOUTH- 

 WESTERN 

 OREGON 



GALICE FM 



ROGUE FM. 



DOTHAN FM 



NORTH- 

 EASTERN 

 CALIFORNIA 



TTi'm'rTTfm.rr 



IINCHMANSS 



BICKNELL SS 



UJ-IJJJJl 



VOLCANICS 



MORMON SS. 



THOMPSON LS 

 FANT ANDESITE 



HARGRAVE SS 



LOWER UPPER 



PLATE PLATE 



FACIES FACIES 



RASPBERRY F 



WINNEMUCCA 



DUN GLEN F 



NATCHEZ 

 PASS FM 



PRIDA FM 



CANE SPRING 



FAVRET FM 



Fig. 17.2. Principal Mesozoic formations of California and western Nevada. West side, Sacra- 

 mento Valley and Coast Ranges, taken from Irwin (1957) and Briggs (1953). Potassium argon 

 dating of Nevadan orogeny by Evernden et al., 1957. Jurassic correlations from McKee ef al., 

 1956. Triassic of eastern Nevada from Ferguson and Muller (1937), of west-central Nevada 

 (Mount Tobin Quadrangle) by Muller et al. (1951), and of southwestern Oregon by Wells (1956). 



- s^-r^ZLlW^&'^-J*!* TH" tH*J<<» ■><>* 



_jas__ 





^S^'Ji==J-. = -S^'^ 





-7%-^ «* Jd. "Rid ^g-pSmygT**. /M, J L ?^SS 



• ••••• •.■•■•'-> - - . i - <• ° - J_S i ~ - 1 



^<7> i i 1 1 1 ' T~tsftii I i /s»J?* <W , ■ i» nnrTT~i i i i i 1 1 1 nTi Tii ft ■ ■ , *■ ■ 



•' * ' " \/ //" * * i • i • ' • * 



Fig. 17.3. Cross sections in the Hawthorne and Tonopah quadrangles, reproduced from Ferguson 

 and Muller, 1949. Top section, north of Garfield Flat showing relation of Dunlap formation to 

 Luning and Excelsior formations. Middle section, south of Sunrise Flat, Gabbs Valley Range, 

 showing thrusting and later normal faulting. Bottom section, south of Redlich siding, showing 

 relations of Ordovician and Permian and the Excelsior formation. Symbols, top section: Jdf, 

 Dunlap fanglomerate and congl.; Jdg, Dunlap vols.; Jds, Dunlap ss.; Jdl, Dunlap Is.; Ilu, 

 Luning upper Is.; lis, Luning slate; Teg, Excelsior vols.; Tec, Excelsior chert and tuff. Middle 

 section; Jdv, Dundap vols.; Jds, Dunlap ss.; Jdc, Dunlap congl.; lid, Luning dol.; Jdt, thrust 

 cong. Bottom section: le, Excelsior vols.; 1c, Candelaria formation; Pc, Permian congl.; Os, 

 Ordovician slate and tuff. 



trusion of the Sierra Nevada batholith, whose satellites are present in the 

 western part of the sediments of the Triassic and Jurassic trough. 



The thrusting in general was easterly along the eastern margin of the 

 trough and southerly along the southern border. 



Representative sections from the Hawthorne and Tonopah quadrangles 

 are reproduced in Fig. 17.3, and the evolution of the complex thrust 

 structure in Dunlap and post-Dunlap time is shown in Fig. 17.4. 



