Coquimbo virtual
www.geovirtual2.cl

Región de Coquimbo, Chile: Registros históricos

Text Charles Darwin: Gravel-Terraces of Coquimbo

Museo Virtual, Chile
W. Griem, 2018
Ochsenius: Guayacán

 Literatura: Charles Darwin

español / deutsch / english

Texto Charles Darwin: Coquimbo
chap. IX. Gravel-Terraces of Coquimbo. p.252-254

Valley of Coquimbo. — The narrow coast-plain sends, as before stated, an arm, or more correctly a fringe on both sides, but chiefly on the southern side, several miles up the valley. These fringes are worn into steps or terraces, which present a most remarkable appear­ance, and have been compared (though not very cor­rectly) by Capt. Basil Hall, to the parallel roads of Glen Roy in Scotland : their origin has been ably discussed by Mr. Lyell.1 The first section which I will give, is not drawn across the valley, but in an east and west line at its mouth, where the step-formed terraces de­bouch and present their very gently inclined surfaces towards the Pacific.

The bottom plain (A) is about a mile in width, and rises quite insensibly from the beach to a height of twenty-five feet at the foot of the next plain: it is sandy, and abundantly strewed with shells.

Plain or terrace (B) is of small extent, and is almost concealed by the houses of the town, as is likewise the escarpment of terrace (C).
On both sides of a ravine, two miles- south of the town, there are two little ter­races, one above the other, evidently corresponding with (B) and (C); and on them marine remains of the species already enumerated were plentiful. Terrace (E) is very narrow, but quite distinct and level; a little southward of the town there were traces of a -terrace (D) inter­mediate between (E) and (C). Terrace (F) is part of the fringe-like plain, which stretches for the eleven miles along the coast; it is here composed of shingle, and is 100 feet higher than where composed of calcareous matter. This greater height is obviously due to the quantity of shingle, which at some former period has been brought down the great valley of Coquimbo.

Considering the many shells strewed over the terraces (A) (B) and (C), and a few miles southward on the calcareous plain, which is continuously united with the upper step-like plain (F), there cannot, I apprehend, be any doubt, that these six terraces have been formed by the action of the sea; and that their five escarp­ments mark so many periods of comparative rest in the elevatory movement, during which the sea wore into the land. The elevation between these periods may have been sudden and on an, average not more than seventy-two feet each time, or it may have been gradual and insensibly slow. From the shells on the three lower terraces, and on the upper one, and I may add on the three gravel-capped terraces at Conchalee, being all littoral and sub-littoral species, and from the analogical facts given at Valparaiso, and lastly from the evidence of a slow rising lately or still in progress here, it appears to me far more probable, that the movement has been slow. The existence of these successive escarpments, or old clifflines, is in another respect highly instructive, for they show periods of comparative rest in the elevatory movement, and of denudation, which would never even have been suspected from a close examination of many miles of coast southward of Coquimbo.
---
El texto se digitalizó con OCR,  adapción de la ortografía y gramatica actual.

Tarreces of Coquimbo, Charles Darwin
Figura No. 23. . East and West Section through the Terraces at Coquimbo, where they debouch from the Valley, and front the Sea.
----
Level of sea.         Town of Coquimbo.
Vertical scale 1/10-th of inch to 100 feet: horizontal scale much contracted.

Región de Coquimbo

Historia de la Región de Coquimbo, Chile

Recorriendo Región Coquimbo
Historia Región Coquimbo

Viaje a Coquimbo (Kunz, 1890)
Earthquake(Gilliss) 1851
Darwin Arquero mine
Darwin: Terraces
Hoya Coquimbo Pissis, 1875)
Hoya del Limarí (Pissis, 1875)
Hoya del Choapa (Pissis, 1875)
Ilustración Puerto de Guyacán
Mapa Espinoza (1903)
Mapa de Coquimbo (Stange 1914)

Ferrocarriles Coquimbo
Literatura Región Coquimbo
Indice de lugares y nombres

próxima página en geovirtual

Relacionado
Ferrocarriles Coquimbo
Línea Tofo
Longitudinal La Calera
Locomotora  La Copiapó
Bibliografía de Atacama

 

 

 

Otros
Ferrocarriles Atacama
Bibliografía de Atacama

Wolfgang Griem en:
Mail a Wolfgang Griemgoogle perfil Wolfgang GriemVer el perfil de Wolfgang Griem en LinkedIn

www.geovirtual2.cl

Literatura:
• DARWIN, CH.
(1876): Geological observations on the volcanic islands and parts of South America visited during the voyage of H.M.S. Beagle. - 2. Edition,  Smith,  Elder & Co.; London.

No se permite expresamente la re-publicación de cualquier material del Museo Virtual en otras páginas web sin autorización previa del autor: Condiciones - Términos, Condiciones del uso.

 
página anterior del geovirtual Historia Región de Coquimbo - Contenido Región de Coquimbo
Índice de nombres y lugares (Región de Coquimbo)
proxima página en geovirtual

 

 

Linea roja

 

www.geovirtual2.cl

Geology (Spanish)
Apuntes
Apuntes Geología General
Apuntes Geología Estructural
Apuntes Depósitos Minerales
Apuntes Exploraciones Mineras
Periodos y épocas
Módulo de referencias - geología
Índice principal - geología
Virtual museum
Virtual Museum: First page
Recorrido geológico
Colección virtual de minerales
Sistemática de los animales
Historia de las geociencias
Minería en ilustraciones históricas
Fósiles en dibujos históricos
Autores de trabajos históricos
Índice principal - geología
---
Images of Chile and Atacama
Atacama Region, Chile
Journey to Atacama / Atacama sightseeing places
History of Atacama
Mining history of Atacama
Geología de Atacama, Chile
The railroad history of Atacama
Flora Atacama
Animals of the Atacama Desert
Virtual viewpoint Atacama / Atacama en b/n
Road - maps / Imágenes 3-dimensionales
Clima de la Región Atacama
Links Atacama, Books & Collection of Books
List of names and places of Atacama

sitemap - list of all files  - schematic content - Information site geovirtual.cl



www.geovirtual2.cl / Museo Virtual / Región de Coquimbo

Región de Coquimbo, Chile
© Dr. Wolfgang Griem, Chile - todos los derechos reservados (Mail a Wolfgang Griem Uso de las páginas de geovirtual.cl y geovirtual2.cl)
Publicado: 1.2.2018, actualizado: 1.2.2018
mail - correo electrónico - contacto
Autor info´s aquí: Google+
Todos los derechos reservados

No se permite expresamente la re-publicación de cualquier material del Museo Virtual en otras páginas web sin autorización previa del autor: Condiciones, Términos - Condiciones del uso