Читать книгу Island Life; Or, The Phenomena and Causes of Insular Faunas and Floras - Alfred Russel Wallace - Страница 13

Table of Contents

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