Field Notebook: Arizona, Texas. 1923, 1924
Page 36
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Transcription
Older Paleogric the town lies on an extensive plain and all about Marathon are high mts. To the north after miles the [illegible] igneous (drawn out) are steep and vertical while further north is the eroding Permian ceries, only slits dips. It is one of the first exposures known to me of an angular unconformity. As I get further afield it appears to me that the central cratered chote is the centre for that appeared distal uplift after the proliferation of the older series. The Paleogric Series rise from the central nucleus and Old Paleogric crest, the rest on this central nucleus and to descend to the eastward as I saw earlier and noted above. I don't if any of these mts are much higher after the Palaeops than 1000 ft. and yet they are shrouded in cords that make me the mts all melt away as the bear away from them. They made out the high sun light a peculiar illumination. At mile last 96 east of Marathon some rocks to the south of the track appear to stand over-