64 INDEX TO THE STRATIGRAPHY OF NORTH AMERICA. 



Hastings and Grenville (22a). 



L 17-18 Ontario and Quebec. 



Middle and Lower Huronian (22b). 



K 14-15 South Dakota, Minnesota. 



L-M 15-16 Wisconsin, Michigan, Ontario. 



L 17 Ontario. 



late (?) pre-Cambriau unclassified (21). 



J 13 Colorado (Needle Mountains group ; mapped with Belt series, 21a) . 



K 12 Utah, Colorado (quartzites of Uinta and Wasatch mountains; mapped with Belt series, 



21a). 



K-L 19-20 Nova Scotia. 



M 18 Quebec. 



L-M 21-22 Newfoundland. 



N-P 18-19, N 20-21 Quebec, Northwest Territories. 



O 15 Northwest Territories. 



0-Q 12-13 Alberta, Saskatchewan, Northwest Territories. 



P-Q14, Q-R 10-13 Northwest Territories. 



Upper Huronian (21c). 



L-M 15-16 Minnesota, Wisconsin, Michigan, Ontario. 



Keweenawan (21b). 



L 15-16 Minnesota, Wisconsin, Michigan. 



M 16 Ontario. 



Belt series (21a). 



J 13 Colorado (Needle Mountains group, which is included with Belt series of map) . 



K 12 Utah, Colorado (late Algonkian, which is included with Belt series on map). 



L-M 11-12 Idaho, Montana, British Columbia, Alberta. In Montana the Cherry Creek group 



(early Algonkian) is mapped with the Belt series (late Algonkian). 



TJndiSerentiated pre-Cambrian (23b). 



H 13-14 Texas. 



1 11-13 California, Arizona, New Mexico. 



1 16-18 Alabama, Georgia, North Carolina, South Carolina. 



J 13 Colorado. 



J 15 Missouri. 



J 17-18 North Carolina, Virginia, Maryland, Delaware, Pennsylvania, New Jersey. 



K 12-13 Utah, Wyoming, Colorado. 



K-L 18-19 Pennsylvania, New Jersey, New York, Connecticut, Massachusetts, Rhode Island. 



L 11-13 Idaho, Wyoming, Montana. 



L-M 14-16 Wisconsin, Michigan, Minnesota, North Dakota (mapped with "Laureutian"). 



Gneisses, schists, and metamorphosed sediments (23o). (Supposed pre-Cambiian, possibly in part Paleozoic and 



Mesozoic). 



B 17-20 Panama, Colombia, Venezuela. 



C 19-20 Venezuela. 



D 14r-16 Mexico, Guatemala, Honduras, Nicaragua 



E 13-16 Mexico, British Honduras. 



F 13-14, G 13 Mexico. 



J 11 Nevada. 



K 10-11 Oregon, California, Nevada. 



L 11 Washington, Idaho. 



. M-N 10-11 British Columbia, Washington. 



O 9-10 British Columbia. 



P-Q 4-8 Alaska, Yukon. 



Q3 Seward Peninsula, Alaska. 



