Little Colorado Valley, Arizona. 501 



Moencopie formation : 



3. Shale, arenaceous, muscovitic. Excessively fine- 



grained ; grey and purple in tone, blotched with 



white 1 "5 feet 



4. Sandstone in 3-5 irregular beds, separated by films 



of shale. Contains thin lenses of red clay pellets 6 



5. Shales, arenaceous and argillaceous in thin beds, 



banded dark brown and chocolate. The parting 

 planes exhibit sun-baked surfaces, mud cracks, 

 muscovite flakes, and minute imbrications. Many 

 impressions of twigs and branches were noted . 20 



Total _ 57*5 



About one mile below the suspension bridge, the angular 

 unconformity between the Moencopie and the Shinarump con- 

 glomerate is again exposed as indicated in the photograph (tig. 

 7). At this point Mr. K. C. Heald found the red-brown shales 

 and sandstones of the Moencopie overlain by 97 feet of Shina- 

 rump conglomerate, "about 40 per cent heavy conglomerate, 

 the rest coarse sandstone with occasional pebbles." 



