stanton.] THE CRETACEOUS. 29 
few other forms, followed by a band of hard limestone containing 
numerous specimens of Requienia. Then conies the " Quitman bed," 
composed of sandstones, clays, and thin beds of limestone, with a 
thickness of 330 feet, succeeded on the west by a great series of sand- 
stones and siliceous limestones, the " Mountain bed," with an ap- 
parent thickness of about 4,000 feet. The western end of the section, 
was thought to be the top, and the entire section was referred to th» 
Washita division of the Comanche series. My studies of more com 
plete sections farther south in the same range, especially the one near 
the Rio Grande, led to the conclusion that the beds at Quitman Can- 
yon and for a long distance southward are mostly overturned, and 
hat the oldest rocks are on the west side of the mountains. 
The Mountain bed, consisting mostly of coarse, varicolored sand- 
tones, forms the western portion of the mountain all the way to the 
Rio Grande at Hot Springs, where it dips to the east instead of to the 
west. Its apparent great thickness may be due in part to folding and 
faulting. It has yielded only imperfectly preserved Ostrea and a few 
pier forms that are insufficient for its correlation with established 
Formations. 
The Quitman bed has a similar distribution along the higher (west- 
rn) slope of Quitman Mountain. Its fauna shows a different facies 
nun any assemblage in the Central Texan section, including Exogyra 
pdtmanensis, Trigonia taffii, Trigonia stolleyi (?) , Eemondia, and a 
considerable number of forms that will be described in a monograph 
)f the Comanche fauna. Although some of the species show rela- 
ionship with later faunas the stratigraphic and paleontologic evi- 
lence as a whole is thought to justify its assignment to the Trinity 
ivision. The best localities found for collecting this fauna are on 
Juitman Mountain about 1 mile south of Quitman Canyon, and on 
he trail from Quitman Arroyo to Hot Springs, about 3J miles from 
he springs. 
The Orbitolina limestone for many miles forms the crest of the 
Juitman Mountains, with a bold escarpment on the east and a steep 
lope corresponding with the dip on the west. Its characteristic 
oraminifera, Orbitolina texana (Roemer), occurs only in the Glen 
lose beds of the Trinity division in Central Texas. Another species 
f the same horizon that occurs with it in the Quitman Mountains is 
he large Natica prcegvandis Roemer, which is usually treated as a 
ynonym of N . pedernalis. The Orbitolina limestone has here a 
hickness of at least 250 feet, and farther south on the Rio Grande it 
ppears to be still thicker, and the Orbitolina again appears in a 
hinner limestone about 300 feet higher. 
On the eastern slope of the mountain 1 to 2 miles south of Quitman 
Canyon there are exposures of several hundred feet of limestones, 
lays, and sandstones dipping toward the mountain and apparently 
