File:Occasional papers of the California Academy of Sciences (1956) (14750227066).jpg

Identifier: occasionalpapers23195661cali (find matches)
Title: Occasional papers of the California Academy of Sciences
Year: 1890 (1890s)
Authors: California Academy of Sciences
Subjects: Science
Publisher: San Francisco : California Academy of Sciences
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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peninsulas; the large one—the Azuero Peninsula—form-ing the west shore of the Gulf of Panama. This, with two smallerones, the Burica Peninsula and the Sona Peninsula, are on the Pacificcoast; two still smaller ones, the Valiente and San Bias peninsulas,are on the Caribbean coast. If the ocean were withdrawn to the 100-fathom isobath, the area of Panama would be increased by aboutone-third, most of the addition being on the Pacific side. The elongatedsigmoidal form would still be preserved, but the large Azuero Penin-sula would no longer be recognizable. The eastern end of the country is in a more advanced stage of theerosion cycle than the western, and this difference extends across thenational boundaries, with the flat basin of the Tuira River of DarienProvince merging with the swampy plains of the Atrato in Colombia;while in the west, the rugged continental divide between Bocas delToro and Chiriqui rises to the lofty volcanic peaks of Costa Rica No. 23J TERRY: GEOLOGY OF PANAMA
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6 CALIFORNIA ACADEMY OF SCIENCES (Oc. Papees (fig. 2). The coastal plain and adjacent lowlands are wider on thePacific than on the Caribbean side, and this difference extends outto the edge of the continental shelf. If the map were continued tothe northwest, the relations between the coastal plain and the conti-nental shelf on the two coasts would be seen to reverse itself, theplain on the Caribbean side becoming wider, that on the Pacific nar-rower. This physiographic change is evidently the surface expressionof a change in the underlying rock structure. Western Panama The lowlands of the Pacific side of western Panama can be dividedinto five distinct physiographic provinces: 1. The Burica Peninsula, on the international boundary at thesouthwestern corner of Panama and the southeastern corner of CostaKica, is a tightly folded and faulted area, the exposures showing rocksof the basement complex and the entire known sedimentary sectionof Panama, with the possible exception of the Oligooccasionalpapers23195661cali

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