'■'> 1 2 77/ r American Geologist. November, 1893 
occur being occupied by drift material to the bank of the 
creek mentioned above. It is probably absent. 
7. Comanche Peak limestone. Along the west bank of the creek 
and in the well is an exposure of Comanche Peak limestone 
somewhat more siliceous than farther ea6t, but with its char- 
acteristic fossils, among which was: Schkenbachia acvto-car- 
inatus, etc JO 
8. Texana bed. The well material showed the top of the Texana 
bed to be a dark blue crystalline limestone composed of Gfryp- 
hcea pitcheri and Exogyra texana en masse. In its outcrops 
on the ravine it also showed its metamorphosed character, and 
on weathering showed ferruginated seams. The base consists 
of a yellow compact crystalline limestone well rilled with Ostrea 
crenulimargo Roeni., the shells of which retain their white 
color and are not altered to the color of the rock as is the case 
with the fossils of the upper bed i 
Bosque Division. 
9. The Paluxy sands are present, as is usual west of Double moun- 
tain, in the form of purple and red sands and brown pack- 
sands, and are interbedded toward the bottom with quartzitic 
layers. They contain but little gravel, and what there is is of 
small size 20 
The G. tucumcarii bed forms the top, or occurs in the slope. 
of the numerous spurs running- out from the hills proper, and 
it has for this reason a greater areal exposure, comparatively, 
than any of the beds above it. For the same reason the G. 
tucumcarii, although quite abundant in places, is also much 
broken, but several perfect specimens, showing both valves, 
were secured by digging. Where the G. tucumcarii were most 
abundant the other forms were rarer, but even where the (,. 
pitcheri formed the chief fossil of the bed the tucumcarii was 
not entirely wanting. The other fossils mentioned are for the 
most part well preserved and occur in considerable numbers, 
as may be seen from the fact that we have twenty specimens 
of - s '. leonensis from this horizon at this locality. In this 
bed the concretionary character of the limestone is quite 
marked, the center of the concretions frequently being formed 
by some fossil such as Schlaenbachia leonensis, and the strati- 
graphic continuity of the bed was proved by tracing it 
foot by foot around the entire area worked. No disturbances 
of any kind were found. 
