154 Udden — Castile Gypsum and Hustler Formation. 



Depth in feet 

 below surface. 

 From To 



Gypsum and dark gray dolomite. The sample con- 

 tains a few scattered grains of quartz. Sul- 

 phur and bituminous fumes were given off 

 when heated in closed tube 275 



Gypsum containing dark dolomite and a few scat- 

 tered grains of quartz and pyrite. Sulphur 

 and bituminous fumes were given off when 

 heated 296 



Gray dolomite, with a few fragments of gypsum, 

 quartz and pyrite. Fumes of sulphur and 

 bitumen noted on heating in closed tube 32*7 335 



White gypsum, some dolomite and a few quartz 



grains and scattered grains of pyrite, at 375 



Gray dolomite, white gypsum, and a few grains of 

 quartz. Fumes of sulphur noted on heating. 

 Below ? •_ 400 



The location of this boring is in the west slope of the Rustler 

 Hills, where the general dip of the Rustler formation clearly 



Figs. 1-14. 



W&i. 7 \ .irk. \ I f~\f i ... V t t 1 Hs *Vv 



scy ^'° 



w 



V 



TTlicro-ns 



Fig. 1. Foraminifera from marls interbedded with the Castile Gypsum in 

 the Troxel oil test No. 1, Survey 24, Block 110, Public School Lands, Culber- 

 son County, Tex. Tentative identifications, made by the author, are as 

 follows : 1, 2, Globigerina bulloides d'Orbigny (?), depth 141-145 ft. ; 3, same, 

 depth 209-213 ft.; 4, 5, Textularia globulosa Ehrenberg(?), depth 141-145 ft.; 

 6, 7, same, depth 209-213 ft.; 8, 9, 10, Bulimina pupoides d'Orbigny (?), 

 depth 141-145 ft.; 11, Bolivina punctata d'Orbigny (?), depth 209-213 ft.; 12, 

 Anomalina ammonoides Eeuss (?), depth 141-145 ft.; 13, 14, Nodosaria, 

 sp. , depth 141-145 ft. 



