CONTENTS. 



PART I. 



PRINCIPLES OF PALAEONTOLOGY. 

 INTRODUCTION. 



PAGE 



The general objects of geological science The older theories 

 of catastrophistic and intermittent action The more 

 modern doctrines of continuous and uniform action 

 Bearing of these doctrines respectively on the origin of 

 the existing terrestrial order Elements of truth in 

 Catastrophism General truth of the doctrine of Con- 

 tinuity Geological time . . . ." I-IO 



CHAPTER I. 



Definition of Palaeontology Nature of Fossils Different 

 processes of f osilization 10-14 



CHAPTER II. 



Aqueous and igneous rocks General characters of the 

 sedimentary rocks Mode of formation of the sedi- 

 mentary rocks Definition of the term " formation " 

 Chief divisions of the aqueous rocks Mechanically- 

 formed rocks, their characters and mode of origin 

 Chemically and organically formed rocks Calcareous 

 rocks Chalk, its microscopic structure and mode of 

 formation Limestone, varieties, structure, and origin 

 Phosphate of lime Concretions Sulphate of lime 

 Silica and siliceous deposits of various kinds Green- 

 sands Red clays Carbon and carbonaceous deposits. .15-38 

 (ix) 



