CONTENTS. 



PART I. 

 PRINCIPLES OF PALEONTOLOGY. 



INTRODUCTION. 



PACK 



The general objects of geological science The older theories of 

 catastrophistic and intermittent action The more modem doc- 

 trines of continuous and uniform action Bearing of these doc- 

 trines respectively on the origin of the existing terrestrial order 

 Elements of truth in Catastrophism General truth of the doc- 

 trine of Continuity Geological time, .... l-io 



CHAPTER I. 



Definition of Palaeontology Nature of Fossils Different processes 



of fossilisation, 10-14 



CHAPTER II. 



Aqueous and igneous rocks General characters of the sedimentary 

 rocks Mode of formation of the sedimentary 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 Lime- 

 stone, varieties, structure, and origin Phosphate of lime Con- 

 cretions Sulphate of lime Silica and siliceous deposits of vari- 

 ous kinds Greensands Red clays Carbon and carbonaceous 

 deposits, 14-36 



CHAPTER III. 



Chronological succession of the fossil! ferous rocks Tests of age of 

 strata Value of Palceontological evidence in stratigraphical Geo- 

 logy General sequence of the great formations, . . 37-44 



