that the brachiopods and the fusulines may indicate different eyes in comparison to other areas. Robby gave me a couple of samples from near Shafter, Tex. He believed of Pm. age. They contain orbituloida and couple of Mollusca of undoubted Upper K age, probably Georgetown. PG. 141 My theory on the cyclic bedding in the upper Wolfcamp is as follows at the present time: 1) Downwarp of Wolfcampian basin to north Deposition of gray and tan shales and a few siltstones gradually filling edge of basin, but beyond "reef" facies. 2) Biohermal activity encroached on this more or less flat bottom "mud" flat from reef (to south) in a northward direction. This accumulating until wave action takes over control. 3) The wave action sorts and worked the later deposits of the biohermal deposits to reduce grain size, increase relative % of quartz and form laminar bedding in upper inch or so. Bypass was important and represents a considerate time of a lost record. Repeat back to condition 1. {note: illustration followed}. There is more to this than just this simple diagram. The east west facies change leave room for more questions than I have answers at this time. PG. 142 7/28/57 trip to Big Bend Park. Collection 7/28/57/1 - 27 m south of Marathon - Glenn Rose upper marl zone; Orbitolina texana. 7/30/57 Collection 7/30/57/1 - light gray shale beneath freshwater limestone in spur between Calamity and Sheep Cks about 26 miles south of Alpine. See ref. Goldich and Elms (CI of Tex. Bull?)- They assign Eocene age to this limestone in Pueth tuff sequence. Stop 14 Big Bend Guide Book. Collection 7/30/57/2 - limestone part of freshwater sequence above. PG. 143 7/31/57 Section 8 (cont) - dip 10°NW. 11) Covered 30', probably gray-brown shale for most part. 12) Calcarenite, greenish and orange-brown weathering, poorly sorted at base, includes dark "light-colored" cherts; very fine green quartz sand, Brach, Crinoid and fusuline frag. The lower part is near a granular or fine pebble conglomerate. Upper 4" becomes well sorted. Collection 7/31/57. Wood frags. common, bryozoans common. Slightly undulate upper smooth surface (3.5'). 13) Covered, 13', probably gray shale. 14) Gray shale, with brown tinge. Collection 7/31/57/2; 5'.