Field Notebook: Texas 1957b
Page 77
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Transcription
In the second bioherm are less numerous although of the same type (probably the same species). Some of the fossils from Collection 8/3/58/4 which were loose may be from the terrace alluvium, but certainly not all of them. The relation still probably exists that these folded rocks to the west are younger. The trend of the “high” would pass beneath the windgap section and above so it is possible that either the bioherms are 1) in place in the “Wolfcamp” sequence; 2) They are folded and/or faulted on the top of the Gaptank or 3) were folded with the Gaptank beds and the whole sequence is an overturned anticline and the steep east dipping beds are the west limb. I would favor explanation 3 most at the moment. The collection from north end of Payne hills is from a limestone similar in color to the Dimple. If the nearby Fusuline beds and PG. 116 (and the ammonoids are Mid Penn) it would suggest the Pennsylvanian rocks of the area should be reconsidered. As it is they are not usable except in a vague general way. PG. 117 8/4/58 Dugout Mt. (North end) King has mapped a fault along the NE face of Dugout Mt., but it is a rather minor thing. The area west of the “Wolfcamp” conglomerate escarpment seems to be Wolfcamp cyclic deposits. The “Hess” ledge seems to be west of {note: illustration followed} PG. 118 the creek draining Dugout Mt. for the most part. 8/4/58/1 - Anthill at top of NE exposure of “Hess” Ledge. Dugout Mt. These fusulines and bryozoans couldn't have come far. The upper portion of the “Hess” ledge at the windgap at NE flank of Dugout Mt. is beginning to shale out toward the NE. 8/4/58/2 - from an anthill and shale slope from middle portion of “Hess” ledge on the north flank of Dugout Mt. when the stream cuts down through the Hess. Loaded with fusulines and bryozoans, but not much else. 2 bags. 8/4/58/3 - from a bed of dark calcarenites about 50' below limestone ridge forms, about 300 yards northeast of collection 8/4/58/2. PG. 119 The lower Leonard shale and siltstone sequence is almost entirely brown-orange weathering siltstones as one goes south along Dugout Peak. PG. 120 8/5/58