Field Notebook: Texas 1959
Page 64
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Transcription
17.) Sandstone, orange-brown weathering, very silty, calcareous cement? 3"-6" beds 30' - stuff hard - rextallized, no fossils? but fine crinital columns, 42' 18.) Limestone, gray/brown weathering, 1" to 3" beds, pock marked. Wilt + f. calcareous foamed part. [22" rextallized, fossil debris abundant] [154' a 3" conglomerate bed, including quartz, quartzite, chalcedony pebbles to 1/2" diameters] Afternoon looked at the rest of the Leonard Fm., lower part of Wood Fm. There isn't much difference between the three facies and three upper units here far east. King's Sect. about 2 miles east is supposed to be quite markedly different in the 2 facies of the Leonard Fm., but I can't say that is true here. from the top of these hills, one can see beds in the Leonard Fm. thicken + thin within short distances. The units of brown-gray dolomitic ls. may change from 120' to 0' thick in 300 yards. Thus there seem to be few "key horizons" in this interval - we have 3 or 4 clay pebble conglomerate zones near the top of the Leonard, a couple of conglomerates in the lower facies - and that is about all. Even there are probably not of too great a regional significance as they are mostly 3 to 6" cobbles. Lenses (near the top, th. f.), at the once lower are calcirudites with locally denuded pebbles + cobbling limestone. clay frag. scattered throughout upper 150' 7/10/59 18cmt. [pebble bed at 190' - 3" pebble band] 293' 19.) Limestone-dolomite, light gray to light brown weathering, 1/16-1/8" laminae of ls alternating with dolostone - 2'