CONTENTS. 



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 im- 

 plied by this Causes of the imperfection of the paloeontological 

 record, 44'52 



CHAPTER V. 



Conclusions to be drawn from fossils Age of rocks Mode of origin 

 of any fossiliferous bed Fluviatile, lacustrine, and marine de- 

 posits Conclusions as to climate Proofs of elevation and subsi- 

 dence of portions of the earth's crust derived from fossils, . 52-56 



CHAPTER VI. 



The biological relations of fossils Extinction of life-forms Geolo- 

 gical range of different species Persistent types of life Modern 

 origin of existing animals and plants Reference of fossil forms 

 to the existing primary divisions of the animal kingdom Depart- 

 ure of the older types of life from those now in existence Re- 

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

 mation next above and next below Introduction of new life- 

 forms, , , 57-6l 



PART II. 

 HISTORICAL PALAEONTOLOGY. 



CHAPTER VII. 



The Laurentian and Huronian periods General nature, divisions, 

 and geographical distribution of the Laurentian deposits Lower 

 and Upper Laurentian Reasons for believing that the Lauren- 

 tian rocks are not azoic based upon their containing limestones, 

 beds of oxide of iron, and graphite The characters, chemical 

 composition, and minute structure of Eozoon Canadense Compar- 

 ison of Eozoon with existing Foraminifera Archceospharince 

 Huronian formation Nature and distribution of Huronian de- 

 posits Organic remains of the Huronian Literature, 65-76 



CHAPTER VIII. 



The Cambrian period General succession of Cambrian deposits in 

 Wales Lower Cambrian and Upper Cambrian Cambrian de- 

 posits of the continent of Europe and North America Life of the 

 Cambrian period Fucoids Eophyton Oldhamia Sponges 

 Echinoderms Annelides Crustaceans Structure of Trilobites 

 Brachiopods Pteropods, Gasteropods, and Bivalves Cephalo- 

 pods Literature, . . . . . . .- . 77-90 



