. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. w'OOdworth: geological expedition to brazil and chile. 117 ture and faulting or otherwise, which must have attended this supposed elevation, than to confirm or refute any conclusion as to the elevation of the coast at a time so recent as that embraced within the period of elevation of beaches, so well established in the Champlain or Hoche- lagan marine district of northeastern North America. The following notes and conclusions thus have the force of being made with a pre- w. COASTAL CORDILLFRA i LONCfTUDlNAL
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. w'OOdworth: geological expedition to brazil and chile. 117 ture and faulting or otherwise, which must have attended this supposed elevation, than to confirm or refute any conclusion as to the elevation of the coast at a time so recent as that embraced within the period of elevation of beaches, so well established in the Champlain or Hoche- lagan marine district of northeastern North America. The following notes and conclusions thus have the force of being made with a pre- w. COASTAL CORDILLFRA i LONCfTUDlNAL Z^jVAlLfY. THE ANDES. Fig. 34.— Diagrammatic cross-section of southern Chile west of the Andes. Based on Pissis and personal observation in the longitudinal valley and Coastal Cordillera. conceived opinion quite opposite in most respects to the judgment w^hich in the sequel I was obliged to make. But the geological struc- ture bearing on changes of level should be first set forth. The geological structure of Chile south of Valparaiso is in its broad outlines readily grasped in such a rapid reconnaissance as I had the opportunity to make. The main facts were clearly outlined by Pissis (1875) from whose work and my own observations the following brief introduction will serve to make clear the relations of the Coastal Cordillera with its frequent earthquakes, and the chain of the Andes lying back from the coast. In south Chile for a great distance north and south there are three well-defined topographic and structural zones, viz.: — the Andesian folded chain with volcanic vents, the Longitudinal Valley confronting the chain on the west, and the Coastal Cordillera forming the coast. These three differently constituted areas are shown diagrammatically in the subjoined cross-section, Fig. 34. The formations which enter into this section were roughly deter- mined by Darwin (1891) as follows: —. Please note that these images are extracted from scanned page images that may hav
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