264 EXPLORATIONS ACROSS THE GREAT BASIN OF UTAH. 



2. 5 feet, light brownish-gray, loose, middle fine-grained sandstone, with some 



harder seams, especially on top, where there is also a thin calcareous ledge, 

 like 9. 



3. 10 feet, similar loose, middle fine sandstone, free of harder seams and concre- 



tions, and of light brownish-gray color. 



4. | foot, seam of hard, finely-grained sandstone, of irregular thickness. 



5. 12 feet loose sanclstone, like 3. 



6. 30 feet, like 2, with irregular, harder seams and concretions, capped by such 



a harder ledge, varying in thickness from J to 1 J feet. 



7. J foot bluish-gray, not very compact, sandstone. 



8. 7 feet like 3. 



9. \ foot white seam, areno-calcareous, parti v chalkv, partly snbcrvstalline. 



10. 12 feet, like 3. 



11. \ foot, white seam, like 9. 



12. 15 feet, like 3. 



13. 1 foot, like 3, but dark gray. 



14. 19 feet, like 3, but light gray and laminated. 



15. 2 feet, like 3, in places more or less whitish and shiihtlv calcareous. 



c. 223 feet — the conic base and the pedestal 



16. 45 feet; dark buff-colored, purely arenaceous shales, so largely developed in the 



sections given above, and forming also the pedestal. 



17. 110 feet; the same, light buff-colored. 



18. 8 feet ; white, very light rock, chalky and irregularly interspersed with fine 



sand. It is a mixture of sand with silicate of lime, and quite similar to the 

 rock from the South Platte, an analysis of which has been given on page 261. 



19. 60 feet, like 17 ; the upper portion more argillaceous. 



d. Below the base in a ravine. 



20. 35 feet, like 7. 



21. 5 feet middle fine, gray, loose sandstone. 



The total altitude of the Chimney Rock from the base is, therefore, 338 feet; that 

 of the whole section 506 feet; and the elevation of No. 21 above the river may be put 

 down at 60 or 100 feet 



The white stratum, No. 18, may still be seen at the foot of the Perpendicular 

 Bluff, some miles farther west. In Scott's Bluffs it is a few feet above the highest point 

 of the road in the gap, but is there mere grayish and arenaceous. Below it we again 

 find the buff argillo-arenaceous strata, Xo. 19, but here rather more clayey; and the 



stratum here is estimated at 200 feet above the river, about the same as at Chimney 

 Rock; the stratification, therefore, appears to correspond to the fall of the river. The 

 total altitude of Scott's Bluffs is about 525 feet, including nearly the whole of the pre- 

 ceding section, and some lower strata. 



stratified with a few irregular scams of calcareous or harder and coarser arenaceous 

 material. In these strata highly-interesting organic remains have been discovered 



