Geology of the Andes. 



553 



Raised beach of Conglomerate 



Ragged barren hills of frachytio 

 porphyry, and contorted 

 Strata of Jurassic(?) lime- 

 stone with granite dykes 



Rolling paionals 



COAST RANGE 



Porphyry, syenite, quartzite 

 and conglomerate 



Humboldt's red "freestone" 



Sandstone 

 Cretaceous limestone 



ARANON 



Granite and mica-schist 



LLA-CALLA 



to run along the coast, starts from Pacasmayo, and ends in 



the sea some three miles t> 



south. 



The western cordillera 

 is doubtless Mesozoic, the 

 Pacific side being pi'oba- 

 bly Jurassic, as in South- 

 ern Peru, and the oriental 

 side Cretaceous. From the 

 slope facing Pacasmayo I 

 obtained Jurassic Cardi- ^ 



ums and Ostreas, and an ^ 



^ >-t 



Ammonite resembling A. 3 

 Murxhisoni. Above Bal- ^ 



o 



sas, near Tomependa, Hum- ^ 



boldt found and Von Buch f 



determined Echini, Isocar- c 



dias, Pectens, Ostreas, and > 



B 



Ammonites of Cretaceous g 

 age, and similar forms were ^ 

 discovered by Rairnondi g 

 below, within the depart- o 

 ment of Ancachs. Half a S" 

 day's journey west of Cha- g 

 chapoyas is a highly fossil- •" 

 iferous limestone, abound- 

 ing with Ammonites and 

 Pectens, which, according 

 to Professor Hyatt, are Li- 

 assic* The fossils are most 



12,630 ; but the recent railway lev- 

 elings from the coast make it onlv 

 12,493. 



* The following is an abstract of 

 Professor Hyatt's paper presented 



Lias limestons 

 Red sandstone 



>PlSC0GUANUNA 



Lias shale and sandstone 



Slate and sandstone 



•'PUNTA VENTArJA 



Limestone 

 Triassio shales 



'^PUNTA DE SCHALCA 



Cretaceous limestone 

 Slate and sandstone 



/CERRO DEICUTO 



Saliferous red sandstone 



Tertiary sands and clays 



-HUALLAGA RIVER 



