50 



TE 



containing pebbles of quartz and other varieties of hard rock ranging 

 from grains of sand to pebbles 2 inches in diameter. In a cut about 



tone ^ (see fig. 8) 

 on a yellow shaly 



1^ miles east of Harper this conglom 



uneven 



that is^ unconformable 



sandstone that contains marine shells. 



The section house called Harper (see sheet 10; p. 62) is built on a 

 sandy shalo in which have been fomid numerous fossil shells of 



ks. In the deep rock cut 



Harper. 



Eleration 7,073 feet. 

 Omaha 606 miles. 



mollu 



m 



about 3 feet 6 inches thick. This coal thickens 



some extent for local use. 



mine 



A 



B 



FiGCKE g.-An unconformity in a railroad cut about 4 miles west of Lookout, Wyo., showing con- 

 glomeratic sandstone (A) of Tertiary age resting on marine shaly sandstone (B) of Cretaceous age. 



Pine Ridge, 



named 



a few scrubby piiions, or nut 

 grow on tiie sandstone cliffs, consists of a liirlit-ffray cliff- 



g ledge 

 TTest of the 

 mment ridges formed by large recldisb-brown lime- 

 numbers of marine shells 



making sandstone tbat forms a prominent nortbward-facin 

 and belongs near the base of the Mesarerde formation. 



stone concretions that 



am 



great 



These are in the transition beds between typical Steele shale and the 



base sand 



contains 



concretiona in which 



fossil -nlants that. HPf^TYi 



Tertiary 



rocks have usually been r^arded aa a part 

 of the Montana group of the Tpper Creta- 

 ceous. These plants indicate that here, 

 as elsewhere in this region, Tertiary beds 



lie unconformably on older rocks. The 



discussed 



the footnote on p. 2 and also in the foot- 

 note on p. 42. The conglomerate caps the 

 hill south of Harper station, where it 

 rests on rocks containing marine shells, 



owing to surface debris. 



determined 



