Plate 9 



Photo by Mrs C. S. Phelps 



A. Ledge of basal Bucks Bridge calcareous saudstone with Heuvelton sand- 

 stone surface in foreground, at Stony Brook falls east of West Potsdam 

 (locality 35). (Looking east) 



See pages 26 and 28. 



Photo by Mrs C. S. Phelps 



B. Higher layers of the lower Bucks Bridge beds in the old mill race on west 

 bank of the Grass river at Bucks Bridge (locality 54) where gastropods 

 were secured. (Looking southeast) 



See page 30. 



