336 GEOLOGICAL SURVEY OF THE TERRITORIES. 



But I was especially anxious to ascertain if the conglomerate formation, 

 remarked at the other localities, had here left some traces as indication 

 of its superposition to the upper Lignitic strata. Nothing like it is seen 

 cither at the top of the hillocks or in the broad bottoms of the valley in 

 crossing it northward in a direct line from Kock Springs. Near this 

 station only, the top sandstone is, here and there, strewn with loose 

 pieces of silicified and finely opalized wood ; but I have seen no pebbles 

 with them. This exploration, however, was tdo rapid and superficial 

 to afibrd positive evidence. It should be repeated under more favor- 

 able circumstances, and pursued in different directions, especially toward 

 the upper end of the> valley. 



§ 8. Green Eiver Station. 



All that can be said in a general way on the succession and the com- 

 l)Ounds of the strata of the Green Eiver group is already published in 

 the reports. As I shall have, however, to remark upon the composition 

 of the numerous beds of bituminous shale of this formation in exam- 

 ining- the value of the combustible mineral of the Lignitic, and also to 

 consider the relation of the fossil-plants which have been found in some 

 of its strata, it is convenient to have for future reference a detailed sec- 

 tion of the measures. The following is taken from near Green River 

 Station, where the succession of strata is clearly seen and exposed in a 

 comparatively great thickness. This section is from top of Pilot Hill 

 downward. 



Feet. 



1. Hard, red ferrnsinous sandstone in layers -" 50 



2. Shaly, reddish, laminated argillaceous sandstone, -with abundant remains of 



tisbes 55 



3. Black bituminous calcareous sbale 7 



4. Red shaly sandstone 5 



5. Black bituminous whale, with remains of fishes 5 



6. Hard, shaly, argillaceous sandstone 7 



7. Black bituminous shale in bank 25 



8. Calcareous thin beds of shale and black bituminous layers alternating 70 



9. Soft, white, calcareous shale 5 



• 10. Hard, white, calcareous shale 5 



11. Bituminous shale and remains of fishes 5 



12. White, soft, calcareous shale 15 



13. Shaly yellow sandstone .> 13 



14. Clay shale, topped by half a foot of bituminous shale 20 



15. White calcareous shale, interlaid by green sand 72 



16. Bituminous black shale 2 



17. Argillaceous shale 33 



18. Sandstone shale 15 



19. Soft, laminated clay shale 17 



20. Shaly sandstone 5 



21. Soft calcareous shale 20 



22. Harder laminated shale, mixed beds 22 



23. Hard calcareous rock - 5 



24. Soft shale and white clay 25 



25. Covered space to bed of river 45 



548 



This section indicates a thickness' of about 40 feet of bituminous 

 matter distributed in thin beds, besides the 70 feet thick bed No. S, com- 

 posed of alternate layers of calcareous and bituminous shales. All 

 these shales are more or less iinpregnated by bitumen, and sometimes 



