446 8ir W. Daicson — The Animal Nature of Eozo'on. 



but comprising a considerable amount of intrusive material. He 

 regards it as either the remains of a primitive crust penetrated by 

 much igneous matter, or as a series of altered rocks older than the 

 Grenville Series, and formed under different conditions. In any 

 case it seems to want the evidences of ordinary aqueous deposition 

 presented by the limestones, ironstones, quartzites, and schists of 

 the Grenville Series. Similar views were advocated in my address 

 on the " Geological History of the Atlantic," before tlie British 

 Association, in 1886.^ 



Fig. 1. — Distribution of Grenville Limestone in the district north of Papineauville, 

 with section showing arrangement of the beds. Scale of map 7 miles to an 

 inch. (See also Dr. Bonney's paper, Geol. Mag., July 1895, p. 295.) 



Dotted area : Limestone. 



Horizontal lines : Upper gneiss (fourth gneiss of Logan). 



Vertical lines : Lower gneiss (third gneiss of Logan) . 



Diagonal Unes : Overlying Cambrian and Cambro- Silurian (Ordovician) . 



The Upper Laurentian of Logan (Labradorite, Anorthosite, or 

 Norian Series), supposed by him to overlie the Grenville Series 

 unconformably, is now stated by Adams to consist of eruptive 



- See also Museum Memoir on Eozoon, pp. 2, 3. Montreal, 1888. 



