Field Notebook: SD, WY 1961
Page 19
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Transcription
Section 3, Measuring up from bentonite at top of unit 3, section 1. (1) 8.0 Silt, clayey becoming silty clay, dk. grey chiefly blocky but becoming somewhat shaley at top. In basal foot two small egg-shaped ls. concs, some up to grapefruit size, mostly brown, 2 few large Protocladia in one. Unit has some silt at top grades abruptly to shale above (unit 2) (2) 6.4 Shale, black, very finely silty, becoming grayer upwards, + increasingly more fissile Sample 7 from upper 2' (3) 2.2 Sand, v.f.q. and grey to dk grey shaley interbedded. Jerosite concentrated in sand, chiefly at top + base, shale has dark frags. (Sample 8) Irish cr banded boils (4) 3.0 Hard grey silty shale +shaly silt with pznt frags. Popcorn crust over it, suggests bentonite content. At top is Fe weath OB streaky silt with red brn conc. Scat. sparsely zoned strika (5) 3.7-? Popcorn as in (4) below, more weathered but appears some stuff Grass roots. 8