182 



DEPARTMENT OF THE INTERIOR 



2 GEORGE V.„ A. 1912 

 Table IX. — Showing Walcott's correlations in the 'Belt Terrane.' 



Belt Mts., 



Montana. 



Cambrian, 

 (Flathead ss) 



Unconformity. 



Marsh, 800' 



Helena, calcareous, 

 2,400' 



Empire, 600' + 

 Spokane, 1,500' + 

 Greyson, 3,000' + 



Aienaceous, 5,100 



Newlancl, 

 Calcareous, 2,200' + 



Chamberlain, 

 Silicious, 1,500' 



Neihart, 700' 



Unconformity. 

 Archean. 

 Total, 12,000' 



Lewis and 



Claeke ranges, 



Montana. 



No superjacent 

 3trata. 



Kintla, 

 Sheppard, 

 Quartzites, 1,200' 



Siyeh, 

 Limestone, 4,000' 



Grinnell, 

 Appekunny, 

 Silicious, 3,800' 



Altyn, 

 Calcareous and 

 silicious, 700' 



Base concealed. 



Total, 9,700' 



Camp Creek, 



Mission bange, 



Montana. 



Cambrian, 



Unconformity. 



la, arenaceous 

 ■<ray, 1,762' 



2a, calcareous and 

 arenaceous, 

 1,560' 



3a. to 3g. 

 Arenaceous, 



mostly reddish. 

 4,491'' 



4. to 7e. 



Arenaceous, red 

 and gray,. 3,887' 

 (198' of li. near 

 summit.) 



Blackfoot, 

 Calcareous and 

 silicious, 4,805' 



C<eur d'Alene 

 District, Idaho. 



purcell range, 



Idaho-Brit. 



Columbia. 



No superjacent 

 strata. 



Striped Peak, 2,000 



Ravalli, silicious 

 and arenaceous, 

 purple, greenish 

 and gray beds, 

 8,255' 



Base concealed. 

 Total, 24,770' 



Wallace, 

 Calcareous and 

 silicious, 5,000' + 



Burke— St. Regis, 

 Silicious and are- 

 naceous, purple, 

 greenish and 

 gray beds, 8,000' 



Prichard, 

 Banded, dark 

 blue gray, blue 

 black and gray, 

 silicious series. 

 10,000' 



No superjacent 

 strata. 



Moyie, 

 Metargillite and 

 quartzite, 3,500' 



Kitchener, 

 Quartzite, 7,400' 



Creston, 

 Quartzite, 9,500' + 



Base concealed. 

 Total, 25,000' 



Base concealed. 

 Total, 20,400' 



