MESOZOIC SYSTEMS ALONG THE PACIFIC 



263 



u u 

 a. < 



3 U 



Danian 



Maestrichtian 



Senonian 



Turonian 



Cenomanian 



95-101- 



Albian 



Apt i an 



Barremian 

 Hauterivian 

 Valanginian 

 Berriasian 



133 



Portlandian 

 (Tithonian) 



Kimmeridgian 

 Oxford ian 

 Callovian 



Bathonian 

 Bajocian 



Lias 



17S 



Rhaetian 



Norian 



Karnian 



Ladinian 



Anisian 



Scythian 



■185-200 



Ochoa 

 Guadalupe 

 Leonard 

 Wolfe amp 

 210- 



Virgil 

 Missouri 

 Des Moines 

 Lamp ass as 

 Morrow 



MISSISSIPPIAN 



Folding and faulting in northwestern Nevada. 



Thrusting of Permian volcanics over King Lear and 



Pansy Lee elastics . 

 Deposition of Pansy Lee conglomerate in north— 



western Nevada. 

 Santa Lucian phase in Central Coast Ranges. 

 Intrusion of great batholiths of Sierra Nevada 



and Coast Ranges. 



r Folding and erosion of King Lear fm. 

 I 



y Uplift and deposition of King Lear fm. in north- 

 west Nevada. 



Subsidence of Luning Embayment. 



Strong, local orogeny and volcanism; folding and 

 thrusting in Hawthorne and Tonopaw Quadrangles. 



.*- Mild, local disturbance resulting in angular 

 unconformity. 



4-" 



Mild orogeny in central and western Nevada 

 resulting in unconformity. 



*— Volcanism, extensive. Folding in central Oregon* 

 •*- Orogeny in Western Nevada: Golconda thrust 



Strong orogeny, folding and thrusting in central 

 and western Nevada. Sharp folding and low- 

 grade metamorphism of Calaveras fm. in eastern 

 California possibly at this time. 



Continued orogeny probably in several phases. 



Beginning of geanticlinal uplift in central 

 Nevada, and compressional orogeny in part. 



« v 



« c 



> o 



O 111 



z o 



jss 



■o So 



ffl c 



> o 



c BO 



z o 



I u 



■o o 



Intrusion of batholiths in southern Klamath Mts. 



and northwestern foothills of Sierra Nevada. 

 •Strong orogeny; Tobin and related thrusts of 



VM5-T-M Quadrangles. Mariposa slate of eastern 



California isoclinally folded with resulting 



low-grade metamorphism. 

 Volcanism and local folding and thrust-faulting 



during deposition of Dunlap fm. in Hawthorne 



and Tonopah Quadrangles. 



O M 



c O 



O Ih 



en o 



Fig. 17.7. Sequence of disturbances in central and western Nevada and California from the 



| central Coast Ranges to the Sierra Nevada. Numbers are absolute ages in terms of millions of 



years and in part are modifications of the Holmes time scale as proposed by Curtis ef a/., 1958. 



\n\ vnWklamath 



1 M^— wxMTS. 





I Z \ 









/ o s 









-I 



^>1'34.4 







pi 





HR7 



<?v 









^ 

 kv 



k * 



131.5 812 



o^ : 





Fig. 17.8. Location and age of 

 granitic rocks in California 

 dated by potassium-argon 



method. Stippled areas are 

 granitic plutons. After Curtis 

 et al., 1958. 



W. 



r Y0SEMITE 



^9 plutons ranging 

 trom 83.3 to 

 953 



fa 



SOUTHERN 

 vCALIFORNIi 



THOLIT/ 



A formation of Early Cretaceous age composed of locally derived clastic- 

 rocks, including pebble to boulder conglomerate, siltstone, coarse graywacke. 

 and finely crystalline limestone is exposed at several places in the central and 

 northern part of the Jackson Mountains, Humboldt County, Nevada. This for- 

 mation (King Lear) was folded and at two places probably completelv eroded 

 before deposition of the next younger unit — a pebble conglomerate com- 

 posed of exotic pebbles of chert and quartzite derived from rocks of early 

 Paleozoic age. This younger pebble conglomerate (Pansy Lee) may be of Late 

 Cretaceous or early Tertiary age and may be equivalent to rocks of similar 

 stratigraphic position and lithologic character exposed over a considerable area 

 of eastern Nevada and western Utah. Both of these coarse clastic formations 

 have been overridden by a thrust sheet of Permian or older volcanic rocks. The 

 dimensions of the thrust sheet are not known exactly but remnants arc exposed 

 over a 25-mile-long segment of the range. Upper Tertiary volcanic rocks ex- 

 posed in the range are not involved in the thrusting. 



The Cretaceous and younger rocks of the Jackson Mountains record a long 

 period of orogenic unrest that included: (1) uplift of the source area of and 

 deposition of the Lower Cretaceous rocks; (2) folding and beveling by erosion: 

 (3) deposition of the exotic-pebble conglomerate; (4) thrusting of the Per- 



