STRIPED PEAK SECTION" 



15 



GENERALIZED SECTION FROM STRIPED PEAK, IDAHO 



The following is a generalized section of Algonkian rocks from Striped 

 peak, north and northeast of the Cceur d'Alene district, Idaho, prepared 

 by Mr F. C. Calkins : 



Formation down. 



Description. 



Approximate 

 thickness. 



Remarks. 



No. 



Name. 



5 



4 



3 



2 

 1 



Striped Peak for- 

 mation. 



Wallace forma- 

 mation (equiv- 

 alent to Daly's 

 Moyieargillite). 



Burke-Saint Re- 

 gis formation 

 (equivalent to 

 Daly's Kitch- 

 ener quartzite). 



Prichard slate 



Creston quartzite 

 (Daly). 



Sandstones and shales, 

 siliceous, purple, red, 

 and green, with shallow- 

 water features. 



Argillites, generally cal- 

 careous, blue gray and 

 greenish gray, with thin 

 beds of calcareous quart- 

 zite and impure lime- 

 stone ; general composi- 

 tion becoming more cal- 

 careous eastward. 



Shaly indurated siliceous 

 fine grained sandstones 

 and quartzites ; colors 

 gray, greenish, and pur- 

 plish ; some hard white 

 quartzite in Cabinet 

 mountains equivalent to 

 Revett quartzite of Coeur 

 d'Alene district. 



Banded dark slates, blue 

 black, blue gray to light 

 gray, with some inter- 

 bedded gray quartzite. 



Gray, more or less flaggy 

 quartzites, with argilla- 

 ceous bands. 



2,000 + 

 5,000 db 



8,000 =fc 



10,000 ± to 

 zero. 



2,000 near 

 Idaho-Mon- 

 tana bound- 

 ary. 



9,900 + 



Near Heron 



No complete 

 section. 



Thickness east- 

 ward not rec- 

 ognized bv 

 Daly. 



Daly's figure. 

 Probably thins 

 out eastward. 



N. B.— Ripple marks, sun cracks, etcetera, abundant in all formations but Prich- 

 ard and Creston. 



NOTE ON LIMESTONES NEAR KALISPELL 



Massive bedded, drab, light colored limestone, breaking up on weather- 

 ing into shaly layers in some of the beds and in others into irregular frag- 

 ments with a conchoidal fracture. A few layers of shaly limestone with 

 some arenaceous interbedded layers occur in the series. Near the town, 

 at the quarry, there is about 300 feet in thickness of the limestones ex- 

 posed. They dip south at an angle of 5 to 10 degrees. The limestones 



