Field Notebook: Texas 1957a
Page 244
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Transcription
PG. 113 7/18/57 East of Texas Highway 51, beds of what I believe are Wolfcampian age (at least lithology) are folded and faulted quite badly. The axis of a syncline strikes N74W from peak of K on NW sides of road up a valley in K on SE side or road. [Slides read 7-18-57-11.] 7/18/57/1 is from a sandstone in the creek in this syncline. This "syncline" is probably drag resulting from faulting NE of locality 7/18/57/1. 50 yards NE of locality 7/18/57/1, beds are on end; probably another fault, not same one. These structures predate K, although the K is jointed or even faulted (1' through) in this zone of weakness. This little area is very complex - 2 sets of faults; one N74W or so and one N3 to 5°E. PG. 114 Gaptank locality Section 17 - This begins in Wolfcamp, concealed fault or faults - Near the base of W.C.. There are 1) A number of chert and quartzite pebble conglomerates and quartz sandstone - 8' orange-brown weathering, Chaetetes and tetracoral parts - 8/24/58/1. 2) Covered and faulted (probably) distance problematical, +/- 20'. 3) Calcarenite, orange-brown weathering, dark gray fresh many fusulines; crinoids, very fine ss matrix. (Collection 7/18/57/2 coarse in slope) 4" to 2' beds, shale partings; 9'. 4) Covered 33', passed one upturned outcrop - marks N74-75°W fault of about 10' throw, south west side up: at 63' the outcrops strikes nearly north south - apparent cut by a fault in that direction, east side. [faults add about 30' to this interval better exposed north of old road]. 5) Calcarenite, orange-brown weathering, shell hash 1.5'. 6) Mostly covered - a 6" unit like 5 seems to crop out in middle of unit. [5']. PG. 115 {note: illustration: bed 2: 7/18/57/2 bed 5: 7/18/57/3 bed 7: 7/18/57/4} 7) like unit 5, in 3" to 8" beds, 4'. The back of this unit has been faulted off. 8) To the best of my ability I believe I found the same beds as 5, 6, and 7, covered for 13', then 9) Calcarenites, orange weathering with an increasing % of quartz sand, upward; Interbeds of conglomerate quartzite and cherts common but with some limestone, many beds are dominantly limestone 24' - upper part dominantly conglomerate - lower part ss. 10) Covered probably the same as 9. Collection 7/18/57/5 - P.King Chaetetes limestone at base of Gaptank along old road. (N dip of anticline is type area).