Field Notebook: SD, ND 1959
Page 39
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Transcription
conspicuous in upper part. At 2.0 above base is zone scattered cone-in-cone in thin brown bentonitic shale. At 6.5 from base large Sphenodiscus found in place in shale In upper few (2±) feet, a mixed silt-shale locally. At top is zone of purple-red exfoliating lons cones which are light brownish gray on fresh surfaces. ⑤ 25.0 Shale, gray, silty, weathers light gray slope. Chiefly a good flaky shale with silt laminae & thin beds and jerositic layers throughout. Shale is siltier upward, locally "mixed". At 4.4 feet from base is another layer purplish weath. Cones, and a few smaller ones are scattered in between it and base of unit. At 14.0± from base scattered gray-white weath dk blue lons cones, flextured irreg. Type. (Scripoid horizon) At 3.5 from top a brownish