138 The Nuevo separated in Page Swires' area is a dark fited dolostone, schistoid spines and some productive cracks are silicified prior to dolomitization, but nearly all other possible have been dolomitized and either completely lost or lack any structures; just outlines. In the Van Horn sects there is about 600-900 ft of Nuevo - about 40-50' of Paw Paw Congl and transition zone. It is similar to the basal conglomerate of the Wapca p and contains siltstones and sandstones possibly the equivalent to the clastics zone, but not the same series.) In James Underwood's area the Nuevo - about 600-700' in the eastern locality (7/25/57/1) and perhaps thicker in the NE locality (7/25/57/2 + 7/25/57/3). These last 2 localities are near the base of the base of the unit but the exact longer was not determined. There is some structure complications in this area and so more detailed work is need. The presence of siltstones & shales and sandstones in the first locality suggest the lower Vs a lower Vs are deep seated dep basin dep as to like the middle Vs 139 7/26/57 Coll. 7/26/57/1 from heavily sugurous rock - above Boguillas ls (K) - this is a possible freshwater ls in pre-volcanic times. Black Peak east of Wylie's Nat. Coll. 7/26/57/2 - SE. of Van Horn about 15; The S-anticline, western most peak - 7/26/57/2 trachyte 10' calcicorite + tuffa 200' water bedded tuffa trachyte but rather are near the margin of the basin, probably the SE side. I've promised Jim to let him know what juelines are from the 273rd locality. I judged a measured section in this larger region came to promise little in the way of juelines. See: Baker, W. & Fed Bull 2745 (?) Wichita, 1963 USGS PB 887