peale.] GEOLOGY SECTION OF CARBONIFEROUS STRATA. 115 



soon crosses the river, as the underlying formations do, and extends to 

 the southward into the district worked over in 1873. Its occurrence 

 there was treated of in the report for that year. 



A section of the strata on Eagle River, as shown in the bluffs, will be 

 given in the section below. This section is compiled from two sections 

 I made in 1873. A portion of the beds being exposed at the base of 

 the bluff below the mouth of Roche-Moutonuee Creek, I had to make a 

 section of the lower beds in the bluff above the mouth of the creek 

 where they were exposed. 



No. 2. — Section of Carboniferous strata on Eagle River. 



Top. Thickness. 



Ft. In. 



1. Pink conglomeritic sandstones 37 5 



2. Conglomeritic sandstones and gray shales 92 9 



3. Light-gray shales with hard sandstone bands 3 9 



4. Blackish micaceous shales 3 9 



5. Sandstones and interlaminated micaceous shales, some of the sand- 



stones conglomeritic 367 2 



6. Sandstone conglomerate with pebbles of quartz from one to two 



inches in diameter. This bed is the base of a bluff-like wall, and is 

 10 feet in thickness. Above are beds of shale and coarse sandstone 

 in alternation. On top is a greenish micaceous sandstone 252 



7. Coarse, grayish sandstone,with interlaminated shales ; near the top is a 



layer of red sandstone, succeeded by a conglomeritic layer 25 1 



8. Fine-grained, reddish-brown sandstone 27 4 



9. Coarse-grained hard sandstone, spotted with green, general color gray.. 4 



10. White and greenish-gray conglomerates and shales. First we. have 



a conglomeritic sandstone, and then green micaceous shales, with 

 black carbonaceous layers; followed by more conglomeritic layers, 

 above which is about 15 feet of hard sandstone, with interlaminated 

 soft shales ; then 5 feet of compact gray micaceous sandstone. Next 

 are very soft greenish-gray micaceous shales, extending for about 10 

 feet, followed by from 10 to 12 feet of alternating shales and sand- 

 stone (some of the latter conglomeritic) in beds from 2 to 4 feet in 

 thickness. Above these are conglomeritic sandstones with shales in 

 the center. The total thickness is about 511 



11. Coarse white sandstone, with a band of hard fine-grained sandstone near 



the top. The micaceous character is marked between the layers 



12. White conglomeritic sandstone 



13. Red conglomeritic sandstones - 



14. Dark-red micaceous shaly sandstones 



15. Brownish-red sandstones, conglomeritic 



16. Fine-grained sandstone, generally white, but becoming pink in places, 



with two or three layers of gray micaceous shale, each from two to 



four inches thickness ---- 4 



17. Coarse white sandstone, with grains of quartz and some decomposed 



feldspar 71 3 



18. Soft greenish sandstone in fine layers, with a few hard bands, each a few 



inches in thickness 99 3 



19. Red sandstone 11 4 



20. Brownish sandstones 99 8 



21. White granular brown-spotted sandstone 8 



22. Greenish-gray micaceous sandstones, partially conglouseritic 352 



23. A space in which the beds were so much concealed that it was impossi- 



ble to make a detailed section ; the upper portion is probably filled 

 with a prolongation downward of the micaceous shales and sand- 

 stones, while the base is limestone. In the latter I found Aviculopec- 

 teri, Pleurophorus, and an Avicula or Bakcvellia. The total thickness 

 of strata as indicated by the space is 408 4 



Total thickness of supposed Carboniferous 2, 504 20 



The remainder of the section to the beds I included in the Devonian ? is as 

 follows : 



24. A laminated trachytic rock 15 feet. 



f- Space probably filled mainly by limestones .. .... > 1000 to im feet 



26. Black iluity limestone, with pieces of pyrite and fragments ot > ' estimated 



Sjpirifcr or Sjpiriferina j 



40 







o 







38 



8 



6 



8 



30 



10 



