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Volcanic Islands

By Darwin, Charles

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Book Id: WPLBN0000604764
Format Type: PDF eBook
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Title: Volcanic Islands  
Author: Darwin, Charles
Volume:
Language: English
Subject: Literature & thought, Literature and history, Literature & philosophy
Collections: Project Gutenberg Consortia Center
Historic
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Publisher: Project Gutenberg Consortia Center

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Darwin, C. (n.d.). Volcanic Islands. Retrieved from http://hawaiilibrary.net/


Excerpt
Although in some respects more technical in their subjects and style than Darwin?s ?Journal,? the books here reprinted will never lose their value and interest for the originality of the observations they contain. Many parts of them are admirably adapted for giving an insight into problems regarding the structure and changes of the earth?s surface, and in fact they form a charming introduction to physical geology and physiography in their application to special domains. The books themselves cannot be obtained for many times the price of the present volume, and both the general reader, who desires to know more of Darwin?s work, and the student of geology, who naturally wishes to know how a master mind reasoned on most important geological subjects, will be glad of the opportunity of possessing them in a convenient and cheap form.

Table of Contents
TABLE OF CONTENTS. CRITICAL INTRODUCTION. CHAPTER I.--ST. JAGO, IN THE CAPE DE VERDE ARCHIPELAGO. Rocks of the lowest series.--A calcareous sedimentary deposit, with recent shells, altered by the contact of superincumbent lava, its horizontality and extent.--Subsequent volcanic eruptions, associated with calcareous matter in an earthy and fibrous form, and often enclosed within the separate cells of the scoriae.--Ancient and obliterated orifices of eruption of small size.--Difficulty of tracing over a bare plain recent streams of lava.--Inland hills of more ancient volcanic rock.--Decomposed olivine in large masses.--Feldspathic rocks beneath the upper crystalline basaltic strata.--Uniform structure and form of the more ancient volcanic hills.--Form of the valleys near the coast.--Conglomerate now forming on the sea beach.

 

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