Field Notebook: Arizona 1925b
Page 70
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Transcription
65 E. Li Oonstme -deorinien Granite Natural Bridge Tharntine Faults are immense here a fault down the Quartizite and near something let 100 ft. W Proterozie acer of Quartzites, Granite When one get outy Natural Bridge onto the Pine road we see at this lift level again the Dev. - Min section showing that that down in the gulch has been faulted down to the lower level, Faulted down 700 ft.at least. About 2 or 3 miles from Pine we examine the Dev. sandstone with thinngs of limestone (often intrafomational engl.) and sandy shale gums. Some of the lii. have angular dembs of the red Proterozie quartzite up to 10 inches acros. These lll isolated, or in small groups. Almost none like it diffused in. Near the top of the hills in sandstone we get an abundance of dark brown casts of Cetypon minornia ovis, and A. bystric occidentalis. On the other side of the road to Dr. is the highly inclined quartzite Proterozie series making a high ridge all the way down to Natural Bridge. Here the relation is not faulted. Therefore the Devonian shale lay against the quartzite ridge. In the Dev. lii. at one horizon I saw many pieces of the red Proterozie quartzite; they are of all sizes up to 6 inches across and angular. Stone not come far.