LOWER SILURIAN SYSTEM OF EASTERN MONTGOMERY CO. 435 



O- Covered with soil and debris to river level. 

 From no. 3 of this section good specimens of O p h i 1 e t a 

 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 4J 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 6J feet of dark blue, light-weathering limestone contain- 

 ing corals and Rafinesquina alternata (Con.) Hall and 

 Qarke. On the upper surface of this exposure is a beautiful ex- 

 hibition of glacial striae. The striae run N70°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 loj feet in thickness, while 

 the upper layers are thin, irregular and somewhat distorted and 

 also aggregate about loj feet in thickness. The dip here is 4°N, 

 6o°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 ofiF by the 



