REPORT OF THE STATE PALEONTOLOGIST 1902 1021 



dark shales 

 with large 

 concretions 



The base of the Portage formation is 12 feet above the lake 

 level. 



Small Lingiiias of two species occur in the black slates. 



The lower part of the Cashaqua shales is not exposed along 

 Pike creek, but above the highway bridge, ^ 

 60 rods from the lake, the upper part is 

 well exposed in the bottom and sides of 

 the channel. 



Fossils are common in the numerous 

 concretions and some of the soft layers. 



The contact with the Rhinestreet shale 

 is at the bottom of a low cascade, and <&s 

 about 15 feet of the succeeding black 

 slates are exposed in the sides of the 

 ravine. 



In the ravine of Eighteen Mile creek the 

 Middlesex shale is exposed in the cliffs in 

 the vicinity of the two railroad bridges, 

 and it is at the water level on the east 

 side of the upper one. 



The lower part of the Cashaqua shales 

 is covered in the bed of the stream, but 

 the upper part appears in the escarpment 

 on the east side 40 rods above the upper 

 railroad bridge, and there is a large ex- 

 posure of the same horizon in the creek 

 bed above the highway bridge at North 

 Evans and for 50 or 60 rods eastward to 

 the old dam. 



In the cliffs at the west end of the dam 

 the contact with the Rhinestreet shale 

 and 50 feet of the black shales may be 

 seen. 



Impressions of goniatites are very common in the Casha- 

 qua shales, and in the concretions also a small Loxonema. 

 Buchiola speciosa is very rare, but a few other lamelli- 

 branchs appear frequently. The shale in the softer layers has 

 about the consistencv of dried clav and the onlv hard lavers 



black and 

 blue shales 



black shale 

 with few 

 concretions 



Cashaqua 

 shale 



Fig. 9 Section on Eigh- 

 teen Mile creek from North 

 Evans to the railroad bridge 

 at Eden Valley. Station 51 



