PEALE.] GEOLOGY SECTION OF CARBONIFEROUS STRATA.' 115 



soon crosses the river, as tbe 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 Ea.sile Eiver, 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-Moutoijiijee Creek, I had to make a 

 si^ction of the lower beds in the bluff" above the mouth of the creek 

 where they were exposed. 



iiiro. 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 iuterlamiuated micaceous shales, some of the sand- 



stones conglomeritic 367 2 



6. Sandstone conglomerate Tvith 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 interlamiuated shales ; near the top is a 



layer of red sandstone, succeeded by a conglomeritic layer 2.5 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 tine-grained sandstone near 



the top. The micaceous character is marked between the layers 40 



12. White conglomeritic sandstone 5 



13. Red conglomeritic sandstones. 38 8 



14. Dark-red micaceous shaly sandstones 6 8 



15. Brownish-red sandstones, conglomeritic 30 10 



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



with two or three layers of graiy 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 



10. Red. sandstone 



20. Brownish sandstones 



21. White granular brown-spotted sandstone 



22. Greenish-gray micaceous sandstones, partially conglonieritic 352 



2:3. A space in which the beds Vvcre 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 a.nd sand- 

 stones, while t*he base is limestone. In the latter I found Aviciilopec- 



ten, Pleuropkorus, and an Avicula or Bakevellia. 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 trach vtic rock 15 feet, 



£■ Space probably filled m;nnly by limestones "-vh^OOO to 1,500 feet, 



26. Black llinty liuiestQue, with pieces of pyrite and fragments ot > ' estimated 

 tSpiriJer or Spirifsnna j 



99 



3 



11 



4, 



99 



8* 



8 







152 







