Typed from original by C. Ross in 2002± C.A. Ross Peabody Museum Yale University New Haven, Conn. FIELD NOTES BOOK 1 Marathon, Texas, Summer 1957 Study of Wolfcamp Hills and Wolfcamp sediments along south front of Glass Mts. - C.O. Dunbar visited me on the field on the 22,23,24 and 25th of June, 1957. June & July, 1957 PG. 1 6-22-57 (Neal) Taylor Ranch-Wolfcamp Hills-Sunny-Warm. Collection-6-22-57-1- Upper of P.King bed 2- point over Geologist Canyon- 200 yards north of Uddenites Saddle. {note: illustration: P.King's Bed 2: layer 1: 20' layer 2: 4' layer 3: 6' layer 4: 4'} Collection 6-22-57-2- From about middle of P. King bed 4- 100 yards east of turn of Creek Geol. Canyon. PG. 2 Hess is a limestone sequence and under lies the Leonard which is siliceous-The Leonard just beneath the sill and top of Wolfcamp is calcarenites, and often very silty- well bed. The Hess Conglo. is "white". The western end of the Wolfcamp looks like a good place to measure the Hess Conglo. and to determine fusulinid sequence in the Lower Hess (or Leonard) - Check this section against the conglo. sequence on the north fork of Geol. Canyon. Question to think about: What is the nature of the cyclic deposition of the Wolfcamp sequence? The limestones start off with rumble and then go up through clastics which become finer and finally are present as finely laminated sand (calcareous). These laminae are similar to the individual sets of beach deposits in Lyons Ss. What cause cycles? What conditions changed to cause deposition of Hess Conglo. and Leonard silt and claustic beds?