18 



C. t>. WALCOTT ALGONKIAN FORMATIONS OF MONTANA 



Algonkian Sections of Northwestern Montana and Northern Idaho 



THE PRINCIPAL HORIZON FOR CORRELATION IS THE FOSS1LIFEROUS NEWLAND LIMESTONE OF THE BELT MOUNTAIN9 SECTION 



Belt Mountains, 

 Montana. 

 Walcott 



Dearborn Area, 

 Montana. 

 Walcott. 



Lewie and Clark 



Area, Montana. 



Walcott. 



Lewis and Living- 

 ston ranges, 

 Montana. 

 Willis. 



Camp Creek, 



Mission Range 



Section, Montana 



Walcott 



North and North Boundary 



east of Caeur Section east from 



d'Alene, Idaho. Kootenay River 

 Calkins. Daly. 



Cambrian. 

 Unconformity. 



Cambrian. 

 Unconformity. 



Cambrian. 

 Unconformity. 



No superjacent 

 strata. 



Cambrian. 

 Unconformity 



No superjacent 

 strata. . 



No superjacent 

 strata. 



Camp Cheek Series, 



Arenaceoue-gray. 

 1,782 feet. 



Calcareous and 

 arenaceous. 



1.&80 feet. 



KlNTLA. 



Sbkppard. 

 Quartzites. 



1.200 feet. 



Arenaceous, 



mostly 

 reddish color. 



4,491 feet. 



Marsh, 300 feet. 



Siyeh limestone. 



Hblena. 



Calcareous. 



2,400 feet. 



Arenaceous. 

 1,015 feet. 



Siliceous and cal- 

 careous. 



945 feet. 



Limestone, 285 feet 



Greenish and 



purple, arenaceous ' 



and siliceous 



strata. 



5,772 feet. 



Arenaceous. 



1,210 feet. 



Empire, 600 + 

 Greyson, 3,000 + 

 Arenaceous etrata. 



5,100 feet. 



Total section, 

 2,510 feet. 



>f section of Algonkian 

 na and northern Idaho 



Grinnrll. 

 Appkkiwny. 

 Siliceous. 



3.800 feet. 



Arenaceous 



red and gray colors. 



198 feet of limestone 



near 700 feet from 



summit 



3,887 feet. 



Striped peak. 

 2.0C0 feet. 



NttWlAND. 



Calcareous. 



A200 + feet. 



Base concealed. 



Total section, 

 6,718 feet.. 



Total thickness < 

 western Monte 

 37,000 feet. 



Altyn calcareous 

 and siliceous. 



700 feet. 



Blackfoot. 



CalcareouB and 

 siliceous., 



4,805 feet. 



Wallace. 



Calcareous and 

 siliceous. 



5,000 4- feet. 



Base concealed. 

 Total section* 



9,700 feet. 



rocks in north- 

 , as now known. 



Chamberlain. 

 Siliceous. 



1,500 feet. 



Nkihart sandstone. 



700 feet, 



Unconformity. 



Archean. 

 Total section, 



12,000 feet. 



Ravalli. 



Siliceous and 

 arenaceous. 



Purple, greenish, 

 and gray beds. 



8,255 feet 



BuhKB- 



Saint Regis. 



Siliceous and 

 arenaceous. 



Purple, greenish, 

 and gray beds. 



£.000 feet 



Yahk, 500 feet. 



MOYIB 



argillite. 



3,200 feet. 



Kitchener 

 quartzite. 



t,4O0 reel 



Base concealed. 



Total section, 

 24,770 feet. 



Pbichard. 



Bonded, dark 

 blue gray, blue 

 black and gray. 



Siliceous series. 



W.000 feet 



Cbeston 

 quarttite 



9,600 4 feel. 



Base concealed. 

 Total section. 



25.000 feet 



Base concealed. 



Total section, 

 80,600 feet. 



