Chapter VI. 



DEVONIAN. 



Color, dark blue. 



Symbol, 15. 



Distribution: Eastern-central United States, eastern Canada, northwestern Canada, and 

 Cordillera of the United States, Canada, and Alaska. 



Content: Devonian as commonly defined through the Appalachians, including Helderberg 

 at the base and higher formations to Chemung and Catskill, inclusive; in the northeast, from 

 Gaspe to New York, Helderberg is included with the Silurian in mapping; in the Appalachian 

 zone south of latitude 38°, the Devonian color on the map includes Silurian; throughout the 

 Cordillera from Mexico to Alaska the Devonian where present is mapped with Carboniferous 

 undivided (14), except that it is distinguished in the Klamath Mountains, California. 



Devonian areas. 



Page. 



H-I 12 Southern Arizona and northern Sonora 271 



1 12 Arizona 272 



1 12-13 Southwestern New Mexico 273 



I 14-15 Southern Oklahoma (mapped with Silurian) 273 



I 15 Arkansas (not mapped) 274 



1 16, J 17 The Appalachian Valley 274 



I-J 16 Tennessee, Kentucky, and northwestern Alabama 275 



J 15-16 Missouri and Illinois 278 



J-K 11-12 Great Basin, Nevada and Utah 282 



J-K 12-13 Wyoming and Colorado (mapped with Carboniferous) 284 



J-K 17-18 Southeastern Pennsylvania, Maryland, and Virginia 285 



K 10 Klamath Mountains, northern California 288 



K15 Iowa 290 



K 16 Wisconsin 290 



K 17 Ontario 291 



K 17-18 Pennsylvania and New Jersey; New York 293 



K-L 16-17 Michigan, Indiana, and Ohio 313 



L 12 Southwestern Montana (mapped with Carboniferous) 319 



L 18 • St. Helens Island, Montreal (not mapped) 324 



L 18-19 Quebec, southeastern townships (not mapped) 325 



L 19 Southern New Brunswick and eastern Maine 325 



L 20 Nova Scotia 329 



M 11 Rocky Mountains of British Columbia (not mapped) 333 



M 19 Northern New Brunswick, -. 333 



M 20 Gaspe Peninsula 334 



M-N 14 Manitoba 335 



M-N 16-17 James Bay, Ontario 335 



N 9, 8 Southeastern Alaska (not mapped) 336 



N-0 12-13 Alberta and Saskatchewan 336 



O-Q 9-12 Mackenzie Basin 336 



P 4-5 Alaska Bange and southern Alaska 337 



P 8 Yukon Territory (mapped with Paleozoic undivided) 338 



Q3 ^. Seward Peninsula (not mapped) 338 



Q 6-7 Yukon-Tanana region 338 



Q 8 Peel River (not mapped) 340 



Q-R 5 Endicott Range (not mapped) 340 



R 3 Cape Lisburne 34] 



S 27 Eastern coast of Greenland 341 



S-U 15-20 Arctic Archipelago and northwestern Greenland 341 



269 



