LIST OF ILLUSTRATIONS. 



Unconformable junction 



of Chalk and Eocene 



rocks, ... 49 

 Erect trunk of a Sigillaria, 54 

 Diagrammatic section of 



he Laurentian rocks, 66 

 Microscopic section of 



Laurentian limestone, 67 

 Fragment of a mass of 



Eozoon Canadense, . 69 

 Diagram illustrating the 



structure of Eozoon, . 70 

 Microscopic section of 



Eozoon Canadense, . 71 

 Nonionina and Grotnia, . 72 

 Group of shells of living 



foraminifera, . . 73 

 Diagrammatic section of 



Cambrian strata, . 78 



Eophyton Linneanum, . 8 1 

 Oldhamia antiqua, . 82 



Scolithus Canadensis, . 83 

 Group of Cambrian Trilo- 



bites, ... 85 



Group of characteristic 



Cambrian fossils, . 88 

 Fragment of Dictyonema 



sodale, ... 89 

 Generalised section of the 



Lower Silurian rocks 



of Wales, ... 94 

 Generalised section of the 



Lower Silurian rocks 



of North America, . 96 

 Licrophycus Ottaivaensis, 97 

 Astylospongia framorsa^ . 98 

 Stromatopora rugosa, . 99 

 iptus octobrachiatus , 101 



