Chapter VII. 



PALEOZOIC UNDIVIDED. 



Color, light reddish purple. 



Symhol, 19. 



Distribution: Little-known regions of the northern Cordillera, Montana, and Canada. (See 



fig- 9.) 

 Content: Paleozoic in general, where data do not suffice to map the diyisions separately. 



Includes some known marine Triassic in the Canadian Rockies. 



METAMORPHIC PALEOZOIC UNDIVmED. 



Color, light reddish purple with light dashes. 



Symhol, 20. 



Distribution: Venezuela, northeastern Appalachian region, northern Cordillera, California to 

 Alaska. (See fig. 9.) 



Content: Metamorphic sedimentary rocks of known or supposed Paleozoic age, together with 

 possibly pre-Paleozoic schists and some igneous intrusive rocks, which have not been 

 separated. Includes some known marine Triassic in the Canadian Cordillera. 



Areas nnapped as Paleozoic undivided. 



Page. 



B-0 18-19 Venezuela 342 



C20 Trinidad 344 



D 16 Nicaragua and Honduras 345 



E 19 Santo Domingo and Porto Rico 345 



F 17-18 Cuba and Isle of Pines 348 



K 10 Klamath Mountains, Oregon 349 



K-L 11-12 Idaho and southwestern Montana 350 



K-L 18-19 New England". 350 



M 9-10, N 8-9 Vancouver Island and Queen Charlotte Islands 350 



M 10-11 Washington and British Columbia 352 



N 10-11 to Q 7-9 British Columbia and Yukon 353 



0-R 2-8 Alaska 353 



B-C 18-19. VENEZUELA. 



For the geology of Venezuela, we refer to Sievers's work '^^^ on the Cordillera de 

 Merida. Under the heading Archean, Sievers describes the granite, gneiss, mica 

 schist and other crystalline schists, and clay slate. After describing the distribution 

 of the granite, gneiss, and crystalline schists and giving in particular many local 

 details which are beyond the scope of this work, he says of the clay slates that they 

 constitute the uppermost division of the Archean, are of general occurrence, and rest 

 as a rule upon crystalline schists, but in part upon the gneiss and also directly upon 

 the granite. From these relations it is apparent that the clay slates are distinguished 

 from the other rocks of Sievers's Archean by an unconformity. The compilers of the 

 map of North America have endeavored to maintain the distinction which appears 

 on Sievers's map and have mapped the clay slates and the underlying crystalline 

 rocks as separate divisions, assigning the former to the metamorphic Paleozoic and 



342 



