Geology of the Paleozoic area of Arkansas south of the novaculite region / by George H. Ashley.

  • George Hall Ashley
Date:
1897
Catalogue details

Licence: Public Domain Mark

Credit: Geology of the Paleozoic area of Arkansas south of the novaculite region / by George H. Ashley. Source: Wellcome Collection.

    92/106 page 304
    FEET. {c, d) A bed of fine gravel (c') into which there run thin layers (cT) of sandy clay without gravel, the fine gravel being the size of a pigeon’s egg and smaller 4 {e) Talus to level of road 2-4 As the cut was but a few days old when noticed, it seems highly probable that the red color at the top of (a) is due to the oxidation of the iron, the color where freshly exposed being gray; the grada- tion from the pure gray at the bottom to the deep red at the top exhibits very nicely the process of oxidation. The relation of the bed of firm sand to the other beds of that period is shown on Antoine creek in 8 S., 23 W. In section 14 it forms a ten-foot bluff for a thousand feet, overlying two or three feet of gravel. At the Antoine crossing of the military road to Fort Towsen and Fig. 37.—Section at the crossing of the Fort Towson road and Antoine creek (8 S., 23 W., section 24). above, section 24, it appears again. Fig. 37 being a cross section at that point. We have : FEET. (a) Bed of gravel dipping east or southeast and ly- ing on a soft, friable sandstone dipping 45° south 8 ((^) Bed of firm sand with same dip 8 (tr) Outcrop on east bank of soft yellow or brown sandstone dipping 70° south, 25° west 3-5 (d) Thin bed of novaculite gravel 2 {e) Bed of very firm sand 8-10 (/) Gravel ? The age of the sand in this case depends somewhat on the age of the uppermost gravel, which is evidently the younger. But the gravel on top may be a very recent deposit made by the creek. The beds of gravel attain no great thickness in the Paleozoic
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