Chapteb v. 



SILURIAN. 



GoloT, violet. 



Symbol, 16. 



Distribution: General tlirougliout northern and eastern North America, east of the Great 

 Plains; represented by the Devonian color (15) in the Appalachian zone south of latitude 



38°; known to be present in the CordiUera and Alaska but not generally distinguished by 

 separate color, except in Mexico, Nevada, and British Columbia. 



Content: In the Appalachians in general includes Medina to Cayuga; in the southern Appa- 

 lachians is mapped with Devonian ; in eastern Canada and New York Helderberg is included 

 on th? map ; in the interior, includes strata of Niagara age ; in the Arctic the Silurian color ' 

 covers areas of the limestone series known to include Ordovician and SUurian. 



Silurian areas. 



Page. 



G-H 12 Sonora, Mexico 227 



H13 Western Texas; trans-Pecos Texas 227 



1 12 Arizona (not mapped) : , 228 



1 13 New Mexico 228 



1 14 Oklahoma 228 



I-J 16-17 Alabama, Georgia, Tennessee, West Virginia, and Virginia (mapped with 



Devonian) 230 



I-K 16 Indiana, Ohio, Kentucky, and Tennessee (mapped with Devonian in Tennessee) . 232 



J 15 Eastern Missouri and southern Illinois 236 



J-K 11-12 Nevada and Utah (not mapped in Utah) 236 



J-K 17-18 Eastern New York, New Jersey, Pennsylvania, and Maryland 237 



K 10 Taylorsville district and Klamath Mountains, Calitomia (not mapped) 242 



K 15-16, L 16 Iowa, northern Illinois, and Wisconsin 242 



K-L 12 Southwestern Montana and western Wyoming (not mapped) 244 



K-L 17-18 Ontario and western New York 244 



L 16-17 Northern Michigan and Ontario 245 



L 17 Lake Temiscaming, Ontario 250 



L 18-19 '. Southern Quebec 250 



L 19 New Hampshire 250 



L 20 Nova Scotia 250 



L-M 19-20 Maine, New Brunswick, and Gaspe 252 



L-M 21 Newfoundland 256 



M 11 Rocky Mountains of British Columbia 258 



M20 Anticosti Island 259 



M-N 13-14 Lake Winnipeg, Manitoba, and Saskatchewan 261 



N-O 8 Southeastern Alaska (not mapped) 262 



N-0 10 Finlay and Omenica rivers section (not mapped) 263 



N-O 16-17 Southwest coast of Hudson Bay 263 



P6-7 Southern Alaska, Cook Inlet to Yakutat Bay (mapped with Paleozoic 



undivided) 263 



P 19 Ungava Bay 264 



P-R 9-10 Bear River and Mackenzie Valley 264 



P-S 10-17 Arctic region 264 



Q 3 Sewaid Peninsula (mapped with Paleozoic undivided) 265 



Q 5-6 Yukon-Tanana region (not mapped) 266 



Q-R5 Endicott Range (not mapped) 266 



S 27 See Chapter IV, p. 224. 



T 16-17 EUesmereland 266 



48011°— 12 15 225 



