588 GEORGE I.: FINLAY 
many points in the lower 118 feet, but the upper 148 feet are not 
fossiliferous. It may well be that the Millsap has no equivalent in 
the section at this point. 
Resting on the limestone, and separated from it by an erosional 
unconformity, are 4o feet of gray and buff, finely laminated sandstones, 
made up almost entirely of quartz grains, with thin bands of black 
shale near the bottom of the series. This formation is below the 
unconformity at the base of the Fountain. ‘Typical exposures are 
met along the stream-bedin Quarry Canyon, a mile to the northeast of 
Manitou, where the upper contact with the Fountain is exposed. 
The basal contact with the highest brecciated limestones of the 
Manitou Canyon section may be seen on the right hand just at the 
entrance to Manitou Canyon. Small fragments of the limestone 
occur in the lowest beds of the sandstone, which rest on an uneven 
limestone floor. Southward from this point the formation is covered 
by overlap of the Fountain. It may be traced northward as far as 
Glen Eyrie Creek, where it is well exposed, although the Fountain 
comes down to the basal granite a short distance beyond, to the north. 
’ The sandstone formation in question is therefore of no great thick- 
ness, and its outcrop, an eighth of a mile or less in width and but 
three miles long, is of small extent. It possesses considerable interest, 
however, because of the fossil plants which are found in the shaly 
layers irregularly distributed through it. A collection of these 
fossils was made and forwarded to Dr. David White, of the United 
States Geological Survey. Lepidodendron obovatum and Lepidoden- 
dron aculeatum were identified by him. Dr. White has pointed out 
to the writer that these species indicate a horizon equivalent to the 
Pottsville of Pennsylvania. ‘These plant remains are the only ones 
of Pennsylvanian age recorded up to the present time from the Rocky 
Mountain region. The shales which contain them are bands four 
feet and less in thickness, black from contained carbonaceous matter 
and traces of coal. ‘They occur near the base of the formation, are 
at times lens-shaped, and quickly thin away. ‘They indicate swamp. 
conditions near the level of the sea. Lepidodendron markings have 
also been found in the sandstones. Concretionary markings are 
common in certain layers. The formation has not up to the present 
time received a name. It is proposed to call it the Gleneyrie 
