Island Life

Island Life
Or the Phenomena and Causes of Insular Faunas and Floras

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Island Life by Alfred Russel Wallace

Published:

1880

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894

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Island Life
Or the Phenomena and Causes of Insular Faunas and Floras

By

0
(0 Reviews)
INCLUDING A REVISION AND ATTEMPTED SOLUTION OFTHE PROBLEM OFGEOLOGICAL CLIMATES

Book Excerpt

Pages 169-209

CHAPTER X

THE EARTH'S AGE, AND THE RATE OF DEVELOPMENT OF ANIMALS AND PLANTS

Various Estimates of Geological Time--Denudation and Deposition of Strata as a Measure of Time--How to Estimate the Thickness of the Sedimentary Rocks--How to Estimate the Average Rate of Deposition of the Sedimentary Rocks--The Rate of Geological Change Probably Greater in very Remote Times--Value of the Preceding Estimate of Geological Time--Organic Modification Dependent on Change of Conditions--Geographical Mutations as a Motive Power in Bringing about Organic Changes--Climatal Revolutions as an Agent in Producing Organic Changes--Present Condition of the Earth One of Exceptional Stability as Regards Climate--Date of Last Glacial Epoch and its Bearing on the Measurement of Geological Time--Concluding Remarks

Pages 210-237

{xv}

PART II

INSULAR FAUNAS AND FLORAS

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