54 WILLIS T. LEE 
to be described in this note, and discussion of them is reserved for 
the more extended report to follow. Dr. G. H. Girty,* of the Geo- 
logical Survey, who has examined them, states that the faunas from 
the Red beds are Upper Carboniferous, although they are sharply 
distinct from those of the underlying limestones which are also Upper 
Carboniferous. He states further that the fauna of the limestone 
overlying the Red beds is also clearly Carboniferous and probably 
older than the Guadalupian fauna. In other words, all of the 2,000 
feet or more of the Red beds just described in the Rio Grande region 
are Carboniferous, and probably older than the Guadalupian or 
so-called Permian of western Texas. 
No red sediments were observed immediately overlying the upper- 
most Carboniferous limestone. In some of the southernmost expos- 
ures, particularly in the Caballos Mountains, this limestone is over= 
lain by dark-colored shales in which Benton fossils‘ were found 
about 200 feet above the Carboniferous limestone. 
At the northern end of the region in Galisteo canyon the triple 
division of the Carboniferous Red beds is characteristically developed, 
although the exposed thickness is much less than it is farther south. 
Only the upper 250 feet of the lower or massive sandstone division 
is exposed. The gypsum is here about rqo feet thick; and the 
upper or pink division, consisting mainly of sandstone, is 300 feet 
or more in thickness. No fossils were found in the Red beds at 
this place, but large collections were obtained from the lower 
division near Tejon, about 12 miles south of Galisteo Creek. 
The limestone which overlies the pink sandstones in the southern 
part of the region, and which has just been described as the highest 
horizon at which Carboniferous fossils were found, does not occur 
in Galisteo canyon. About 200 feet of variegated shales and sand- 
stones, having the same general appearance as the Morrison forma- 
tion, overlie the pink sandstones and are separated from them by 
what appears to be an unconformity of erosion. This was seen in 
only one place. The variegated shales are overlain by a massive 
white friable sandstone about 60 feet thick and similar in appear- 
t Personal communication. 
t The Cretaceous fossils referred to here and elsewhere in this paper have been 
identified by Dr. T. W. Stanton. 
