x CONTENTS. 



CHAPTER III. 



Chronological succession of the fossiliferous rocks Tests 

 of age of strata Value of Palaeontological evidence in 

 stratigraphical Geology General sequence of the great 

 formations 38-45 



CHAPTER IV. 



The breaks in the palaeontological and geological record 

 Use of the term " contemporaneous " as applied to 

 groups of strata General sequence of strata and of life- 

 forms interfered with by more or less extensive gaps 

 Unconformability Phenomena implied by this Causes 

 of the imperfection of the palaeontological record 45~53 



CHAPTER V. 



Conclusions to be drawn from fossils Age of rocks Mode 

 of origin of any fossiliferous bed Fluviatile, lacustrine, 

 and marine deposits Conclusions as to climate Proofs 

 of elevation and subsidence of portions of the earth's 

 crust derived from fossils 53-58 



CHAPTER VI. 



The biological relations of fossils Extinction of life-forms 

 Geological range of different species Persistent types 

 of life Modern origin of existing animals and plants 

 Reference of fossil forms to the existing primary divi- 

 sions of the animal kingdom Departure of the older 

 types of life from those now in existence Resemblance 

 of the fossils of a given formation to those of the for- 

 mation next above and next below Introduction of new 

 life-forms 58-62 



PART II. 

 HISTORICAL PALAEONTOLOGY. 



CHAPTER VII. 



The Laurentian and Huronian periods General nature, 

 divisions, and geographical distribution of the Lauren- 

 tian deposits Lower and Upper Laurentian Reasons 

 for believing that the Laurentian rocks are not azoic 

 based upon their containing limestones, beds of oxide 

 of iron, and graphite The characters, chemical com- 

 position, and minute structure of Eozoon Canadense 

 Comparison of Eozoon with existing Foraminifcra 

 Archceosphcerince Huronian formation Nature and dis- 

 tribution of Huronian deposits Organic remains of the 

 Huronian Literature 65-77 



