336 INDEX TO THE STRATIGRAPHY OF NORTH AMERICA. 



the Attawapiskat on the north but are confined to the southern part of James Bay 

 and the adjacent country extending a short distance north of the Albany. 



Parks "^^ describes the strata exposed on Kwataboahegan River as limestones 

 of a yellowish-brown color, literally filled with organic remains. A grayish lime- 

 stone, poorer in moUusks but richer in corals and brachiopods, also occurs, but the 

 relations of the two were not determined. Many species are described and figured. 



N 9, O 8. SOUTHEASTERN ALASKA. 



Devonian limestones occur intercalated with igneous rocks in the islands of 

 southeastern Alaska. The recent work of Wright and Kindle has resulted in col- 

 lections of fossils which have marked European affinities and represent Lower, 

 Middle, and Upper Devonian but which are not related to the American contem- 

 poraneous faunas. No complete section of the series is known. Exposures on 

 Long Island, Kasaan Bay (latitude 55°, longitude 133°), show 470 feet of Middle 

 Devonian limestone, conformably overlying bedded igneous rocks. Lower Devonian 

 limestone occurs at Freshwater Bay, Chichagof Island (latitude 58°, longitude 135°). 

 On the west coast of Prince of Wales Island fossUs of the Upper Devonian have been 

 collected."^" 



N-O 12-13. ALBERTA AND SASKATCHEWAN. 



Devonian limestone extends horizontally beneath the superficial deposits of 

 parts of Saskatchewan and Alberta, outcropping here and there in river gorges and 

 occasioning rapids in the streams. On the east it rests upon "Laurentian" and on 

 the west it is overlain by horizontal Cretaceous beds ("Tar sands," referred to 

 the Dakota by McConnell) .'^^'' The section on lower Peace River, according to 

 Macoun,^^^ exhibits thin-bedded limestone strata made up almost wholly of branching 

 corals and carrying beds of white gypsum. Higher up the stream the limestone is 

 evenly stratified, is light grayish or cream-colored, and alternates with softer, more 

 argillaceous bands. ^" 



O-Q 9-12. MACKENZIE BASIN. 



East of the Rocky Mountains in the Mackenzie basin Devonian rocks have a 

 wide distribution. The strata classed as Devonian may include Silurian below and 

 exhibit a transition phase toward the Carboniferous above. McConnell ^^° states: 



Devonian rocks * * * underlie the greater part of the country bordering the Mac- 

 kenzie, all the way from Great Slave Lake to below old Fort Good Hope, a distance measured 

 in a straight line over 700, mUes. They were found all around the western arm of Great Slave 

 Lake and were traced up Hay River to the falls and up the Liard to the "Long Reach." South 

 of the Liard and extending as far south as the Peace River, the Devonian outcrops at the surface 

 ia a broad band, averaging fully 150 mUes in width, striking in a northwesterly and south- 

 easterly direction, parallel to the western margin of the Archean axis. On the southwest it is 

 generally overlain by the Cretaceous and on the northeast overlaps all the older Paleozoic 

 formations and comes directly in contact with the Archean. In all this region the beds are 

 practically undisturbed and are seldom affected by dips exceeding a few feet to the mile. 



Throughout the Mackenzie district the Devonian is generally divisible lithologically into 

 an upper and lower limestone, separated by a varying thickness of shales and shaly limestones, 

 but in some cases limestones occur throughout. The upper division has an approximate thick- 

 ness of 300 feet and consists of a compact yellowish-weathering limestone, occasionally almost 



