134 J. W. Beede — Correlation of tlie Guadalupian 



stones and clays and only thin bands of limestone occur with 

 just sutKeient red material to suggest their relationship to the 

 rocks a few miles farther east, where the clays and sands are 

 more abundant. However, about ten miles northwest of San 

 Martine is an outcrop of a hundred feet or so of red sandstone 

 which may possibly be Triassic in age. 



East of Carlsbad, near the rim of the Staked Plains, red 

 sandstone overlies the gypsiferous beds. These beds were 

 reported to me by Professor E. O. Wooton, of the Agricultural 

 college at Las Cruces, who made a ti-ip up to the Plains at the 

 time of my visit. They are the Triassic beds of Drake.* 



The gypsiferous beds are excellently exposed in the high 

 bluff six miles south of Lakewood, south of the South Fork of 

 Seven Rivers and west of the Pecos river. In the northeim 

 scarp of the hills, near the eastern end, the gypsum is nearly 

 300 feet thick as measured by the barometer. The layers are 

 separated by thin bands of limestone. Red materials appear 

 on the eastern and western extension of these hills near their 

 base. There is a limestone above the gypsum beds varying 

 from ten to seventeen feet in thickness, but which is much 

 thinner a mile or two farther west in the same hills. About 

 ten feet below the crest of the escarpment and a little west of 

 its eastern end, fossils were found, some of. which are like 

 those occurring in the Quartermaster beds in the Texas Pan- 

 handle. 



On the east of the Pecos river two miles southeast of the 

 mouth of the South Fork of the Seven Rivers, Fisher finds 

 the following section :f 



Massive gray limestone 35 ft. 



Gypsum and red sandstone in alternating layers with 



occasional Hmestone ledge.- ..-- 50 " 



Gypsum with thin-bedded, porous limestone, and red 

 sandstone arranged alternately, the gypsum predomi- 

 nating 150 " 



Gypsum with thin layers of gray limestone 50 " 



Total 285 " 



This section exhibits the normal red beds conditions east of 

 the Pecos river and should be compared with the others from 

 east of the river given on the same page. Cummins has com- 

 pared the lithologic character of these beds with the gypsiferous 

 upper red beds east of the Staked Plains, as well as demon- 

 strated their stratigraphic continuity.;]: For the sake of illus- 



*Geol. Surv. Tex., Third Ann. Eep., p. 246, 1892. 



+ U. S. Geol. Surv., Water Supply Paper 158, page 7, 1906. 



iGeol. Surv. Tex., Third Ann. Rep., pp. 301-228, 1892. 



