(22) At this time I'm not too sure of the data, but the deal about shifting and cooling reefs maybe a partial answer to the big picture. Perhaps in well logs we could get the needed 3D perspective on the facies shifts. After briefly looking at the lower Nexas, I wonder at what silt, sandstones, and cemented siltstones, with a few interbedded ls. might mean with relation to the cyclic Wolfcamp and the circular and peculiar Uddendites zone. The [illegible] phasing of the bivalve growth in the Wolfcamp must have had other types of deposits elsewhere - could they not be represented in either the Uddendites facies (no because of fossils?) or the lower Nexas (which is not well known faunaally). The Nexas section I saw in the afternoon needs to be restudied in greater detail. The massive cliff former on the Hill is probably all Nexas, but King reports some Wolfcamp and so the face of the hill needs to be studied. Section 23 6/28/57 23 Near Centring WCHs - Section III in line N30W of Taylor (Neal) Ranch 1.) Upper Gaptank ls - same unit as 3 in Section II. Here it is less massive, about 8' feet, with the middle modular zone of unit 3 in Section II thickening up to at least 10', about 12' more is covered and it looks as if the lower massive zone of unit 3 such that it is either missing one modular line. The upper 2 to 3' is a nodular ls, in 6 to 8" layers - becomes sandy Collection 6/28/57/1 covered 23-1 3' Top of Gaptank 8' to about 5' 10' covered 12' 13'