LOWER SILURIAN SYSTEM OF EASTERN MONTGOMERY CO. 435 
C! Covered with soil and debris to river level. 
From no. 3 of this section good specimens of Ophileta 
complanata Van. were obtained in considerable numbers and 
also a few specimens of Lingula (Glossina) acuminata 
Con.? and several well preserved specimens of two small 
lamellibranchs. The layers of this section correspond closely in 
stratigraphic position to those exposed in the mouth of Chucta- 
nunda creek. Calciferous sandrock is exposed in the bed of the 
creek to the gorge above Sandford’s carpet mill. Just north of 
the dam at Sandford’s mill are 44 feet of thick bedded, grayish, 
fossiliferous limestone weathering lighter gray. The base of the 
exposure is 10 feet above the Calciferous sandrock exposed in the 
creek bed below the dam. Near the large warehouse on Willow 
street are 64 feet of dark blue, light-weathering limestone contain- 
ing corals and Rafinesquina alternata (Con.) Hall and 
Clarke. On the upper surface of this exposure is a beautiful ex- 
hibition of glacial striae. The striae run N7o°W. The rocks 
at this point dip about 3° S, 24° W. Following the branch of the 
creek from this point the Calciferous sandrock is again exposed 
in the creek bed, the layers being in the main thinner than those 
farther down stream. At approximately 60 feet above the ex- 
posures at Sanford’s mill the course of the creek becomes more 
easterly, and on the north side of the creek at this point there is 
a quarry in Trenton limestone in which the basal layers are mas- 
sive, thick bedded and aggregate about 104 feet in thickness, while 
the upper layers are thin, irregular and somewhat distorted and 
also aggregate about 104 feet in thickness. The dip here is 4°N, 
60°W. Where the course of the creek again becomes southerly 
the rocks are thin bedded, highly inclined and distorted and con- 
tain immense numbers of fossils. The creek flows in a trough 
formed by a small synclinal fold. These layers are separated by in- 
tercalations of black shale, specially noticeable in the highest layers. 
In the west bank of the creek at the dam of the reservoir just 
below the plank road were found loose fragments of Utica shale in 
such abundance as to suggest that they came from rock in place. 
Layers were not found however and it may be that the shale was 
placed there as ballast for the road, a supposition which would be 
perfectly in accord with methods of highway construction in this 
part of the country. All exposures of rock are cut off by the 
