548 Prof. S. H. Reynolds—The Rocks of the Avon Section. 
affects the fossils of upper K,, 8, and Z,, and the Litho- 
strotiont corals, and occasionally the Seminule at many levels in 
the Seminula beds. . 
(c) Argillaceous rocks. 
Thick shales are met with at three levels :— 
(1) Throughout the Clezstopora beds. 
(2) In the upper part of C, (Canina dolomite) and in the lower 
part of §,. 
(3) In the upper part of D, and of D,. 
Thin shaly partings occur in upper 4,, in §, (c), and throughout 
the more calcareous parts of the D beds, where they are often 
associated with pseudobreccias. 
