Fig. 3. 



1 mk ^M 



~r.Tr*- 



v «i Aili 









TVie "Lower Beds.' 1 



Fig. 3. Looking south up Mazon Creek. The pebbly banks are cov- 

 ered with nodules and the stream bed is filled with them. They are 

 easily collected by wading. Just above the rushes in the upper right corner 

 the nodules are non-fossiliferous. Note the high bluff to the back. This 

 continues along the west bank for some distance. 



Fig. 4. 



Ihe "Lower Beds." 



Fig. 4. A nodule just weathering out of the shale (at the head of the 

 hammer). Others may be seen at the base of the slope. This shows the 

 shales in position. The nodules contain, for the most part, species of 

 Neuropteris. 



