138 GEOLOGICAL SURVEY OF THE TERRITORIES. 



Base. Thickness. 



Feet. 



5. Light gray sandstone 1 



6. Space covered with a brownish debris in which are nodular masses of brown 



limestone ; near the center of the space is a band of white sandy debris.. 45 



7. Black argillaceous shale \ c 



8. White sandstone i 



9. Space covered with debris, in which are occasional outcrops of black and 



reddish shales Sfi 



10. Rather massive light greenish-gray sandstone 8 



11. Greenish and purplish shales 6 



12. Bluff of yellowish sandstone, massive below, becoming shaly above, con- 



taining fragments of stems and leaves 104 



Total, about . 217 



In layer No. 12 I found an indistinct Aralia, which Professor Lesquereux considers 

 Cretaceous. The section ou station 26, still farther south, was given in chapter III. 



On tbe ridge dividing " Oh be Joyful "' Creek from Anthracite Creek, 

 near station 32, I made the following section, the letters corresponding 

 with those in the illustration in Plate X : 



Section No. 18. — Head of "0 hejoyfuV Creelc. 



Thickness. 

 Base. Feet. In. 



f 1. Massive white sandstone, reaching from the base of the cliff for sev-^ 



I eral hundred feet | 



E. { 2. Gray shales, succeeded by massive sandstone } 500 



I 3. Black shales and rusty sandstone I 



t 4. White sandstone succeeded by hard bluish sandstone J 



' 5. Bluish-gray laminated sandstones 7 9 



6. Cougloraeritic sandstone, gray below, becoming yellowish toward 

 the top. There are pebbles of red jasper 15 9 



7. Purplish and yellowish argillaceous shales 11 6 



8. Metamorphosed conglomerate 3 



9. Metamorphosed sandstone, white and greenish below, purplish above ; 



D. ■{ some of the layers are conglomeritic 77 9 



I 10. Fine-graii ed, very compact, purplish sandstone, breaking into small 



I cubical blocks 4 5 



I 11. Greenish and purplish argillaceous shales, in thiu laminae 11 10 



I 12. Purple sandstone resembling that of No. 10, more laminated at the 



I top... 12 



1^ 13. Purple and yellow argillaceous shales 10 



C. 14. Greenish trachyte in massive layer 18 



r 15. Greenish aud gray shales, partly argillaceous 11 8 



■o J 16. Dull greenish coarse sandstones 17 



^ 17. Greenish and purplish mottled sandstones, generally compact, break- 



l^ ing into irregular pieces ; some layers are conglomeratic 35 



18. Compact purple sandstones, in bands of eight inches to a foot thick- 

 ness, breaking at right angles to the plane of deposition. Ou the sur- 

 faces quartz crystals are numerous. This bed forms the top of the 

 bluff 88, 



Total, about 883 8 



Most all these sandstones have a metamorphosed appearance, and 

 the ridge in which they are exposed is intersected with dikes, which, 

 will be described in a subsequent portion of the report. Below the, 

 strata of the section just given there are probablj^ 1,000 feet of shales 

 and sandstones to a series of coal-bearing strata on "Oh be Joyful" 

 Creek. The latter, according to Mr. Holmes's estimates, is about 2,000 

 feet above the Dakota group. The upper portion of these beds may 

 possibly have to bf referred to the Lignitic group, but for the present 

 1 refer them to the Upper Cretaceous. 



On one of the small southern branches of Anthracite Creek, near its 

 head, is an outcroj) of autbi-acite coal. We found tbe float in the creek- 



