A 



TRENCH 



Ku T Ku Ku J 



r^ 



ANDEAN COROtLLERA 

 Chimborozo vol. Tungurohuo vol 



° M » -— _ Pa\ _Jv K 



...,M?2 ' 



pKm 



ECUADOR 



After Marks, Lewis, and Tschopp, 1956 



CORDILLERA OCCIDENTAL 



TITICACA 

 TROUGH 



Pichupichu vol 



B* 



CORDILLERA 

 ORIENTAL 



KRUMr.'.EL DEEP 



IHvTp P T O «u Hu * Kl Ku _ B_- 



SOUTHERN PERU 



filler Jenks, 1956 



SHELF SLOPE 



ANDEAN CORDILLERA 

 QMv 



CENTRAL CHILE 



After Critti, 1956 



SHELF SLOPE 



ANDEAN CORDILLERA 

 prim Kl K 



200 KILOMETERS 



SHELF SLOPE 



'pKm K l> K 

 SOUTHERN CHILE 



BAY OF SEBASTIAN VIZCAINO 



After Cristi, 1956 



OCCIDENTAL 

 TV 



8AJA CALIFORNIA 



GULF OF CALIFORNIA 



SONORAN COASTAL PLAIN "" ~ PARALLEL VALLEYS AND RIDGES 

 Tv J* Tv_ Jj» _ Tb j-j, Tb Ife^iUU- Tv Tb Kv Tb Tb 





MEXICO 



Fig. 34.5. Cross sections of the western Cordillera of South America and Mexico showing 

 major igneous and sedimentary units. See maps, Figs. 34.1, 34.2, and 35.1 The vertical scale 

 is about twice the horizontal scale but, even so, some of the thicknesses of the stratified units 

 are undoubtedly too great. Interpretations at depth have been made which are not shown 

 on original sections of authors cited. 



PC, Precambrian; Pal, Paleozoic; D, Devonian; J?, Jurassic and Triassic strata; J. Jurassic 



After R E King, 1939 



strata; Jv, Jurassic volcanics; pKm, pre-Cretaceous strata; Klv, Lower Cretaceous volcanics; Klj 

 Lower Cretaceous strata; Ku, Upper Cretaceous strata; K, Cretaceous strata; Ki, Cretaceous bath- 

 olithic intrusives; Kv, Cretaceous volcanics; T, Tertiary strata; Tb, Tertiary basin beds; Tv 

 Tertiary volcanics; E, Eocene strata; QMv, Quaternary to Miocene volcanics; Ti, Tertiary in; 

 trusives. 





or 



IV- 



lit 



ISO 

 HI 



1 



le 



Jff 



PI! 

 k 



