What we may expect--The number of known species of extinct animals--Causes of the imperfection of the geological record--Geological evidences of evolution--Shells--Crocodiles--The rhinoceros tribe--The pedigree of the horse tribe--Development of deer's horns--Brain development--Local relations of fossil and living animals--Cause of extinction of large animals--Indications of general progress in plants and animals--The progressive development of plants--Possible cause of sudden late appearance of exogens--Geological distribution of insects--Geological succession of vertebrata--Concluding remarks
CHAPTER XIII · THE GEOLOGICAL EVIDENCES OF EVOLUTION
From Darwinism: An Exposition of the Theory of Natural Selection by Alfred Russel Wallace.
