198 GEOLOGICAL SURVEY OF THE TESRITORIES 

 I 



19. Pink mottled laminated shales, 9 ^ About 461 feet thick, 

 feet , 



1 20. White limestone, 2 feet 



f 21. Space 



I 22. Gypsum, 81 feet 



g. <J 23, White sandstone, 22 feet 



I 24. White limestone, 2 feet. . , 



I h. 1 25. Space, 100 feet 3 



i. — 26. Massive siliceous sandstones, yellowish, 213 feet. 

 j.— 27. Space. 



/t. — 28. Limestones, fossiliferous. 

 I. — 29. Space, valley of West Plum Creek. 



^ 30. Brown sandstone shales, 2 feet. 



I 31. Space. 



I 32. Yellow sandstone shale, 2 feet. 



I 33. Fine white sandstone, 6 feet. 



} 34. Yellow sandstone, 10 feet. 

 3o. Space. 



36. Yellow sandstone, 60 feet. 



37. Space. 



38. Yellow sandstone, 75 feet. 

 ( 39. Space. 



0. — 40. Sandstone conglomerates, 841 feet. 



2).— 4:1. Trachyte, 20 to 30 feet. 

 In this section I am inclined to consider all the beds from >To. 2 up to 

 the base of JSTo. 9 as Carboniferous, a total thickness of about 114 feet. 

 None of these lower beds seem to agree with the Silurian layers in Glen 

 Eyrie, nor with those found west of the range on Trout Creek. I have 

 therefore referred them all to the Carboniferous. Future investigation 

 may modify this view. The fossils found in No. 8 [Terehratida and 

 Spiriferina,) prove it to be Carboniferous beyond doubt. Layer No. 9 is 

 the same as No. 17 in the Platte Eiver section, (No. 1,) and is the lower 

 portion of the Triassic. Nos. 9, 10, 11, and 12, comprehend the beds that 

 we have in Nos. 14, 15, 16, and 17 of the Platte section, (No. 1.) Here, 

 however, they do not appear to be so thick. The difference may be ap- 

 parent rather than real, as the thicknesses in both cases are only esti- 

 mated. The red sandstones (No. 11) are massive, and present the same 

 characters we have seen in the same beds all the way from the Platte 

 southward. Space No. 10 is probably filled with an extension of these 

 beds into those of No. 9. The red sandstones in the upper part of No. 

 9 are of a dark purplish color. The angle of dip of the lower beds (No. 

 2 to 9 inclusive) is 10° ; at No. 12 the dip has increased to 30°. The 

 red sandstones are not abruptly succeeded by the yellow sandstones of 

 No. 12, but there is a gradual change, the upper part of No. 11 being 

 somewhat faded, while in the lower part of No. 12 we find streaks 

 and spots of red. These variations in color give the bluff on which they 

 are exposed a rich and beautiful appearance. In the upper part the 

 sandstones of No. 12 become very light colored. Space 13, as indicated 

 by several indefinite outcrops, must be filled with the continuation of 

 the sandstones of No. 12. The dip on the summit of the ridge is north 

 65° east. In No. 14 we have the lowest of the beds that I have con- 

 sidered as Jurassic, extending up to space 25. Near the top of No. 19 

 is a layer having a very irregular structure, and containing cavities lined 

 with crystals of calcite. The lamination is most decided at the bottom. 

 The gypsum bed (No. 22) is well exposed here. As we have it again 



