308 THE STRUCTURE AND SUCCESSION AT 



beds converge, but they do not meet within the limits of the 

 section. 



Indian Cove seam. — About eighty feet of strata, in part 

 concealed, separate the last named seam from the Indian Cove 

 seam. This is four feet thick, has a micaceous underclay, and 

 a bituminous shale roof. The roof is calcareous and fosil- 

 ferous, containing large numbers of shells of Cytherea. The 

 seam is worked by the Sydney Coal company, under the name 

 of the " Greener mine." The coal contains a large amount of 

 pyrite, which has decomposed near the outcrop. The rusty 

 water from the opening on the shore is rapidly cementing the 

 beach material into a conglomerate. On the Big pond end of 

 the same seam is the long abandoned Ingraham mine, which 

 was worked nearly thirty years ago for local use. In the old 

 trenches remaining from this early work, a considerable (quan- 

 tity of iron has been deposited, resembling ordinary bog iron in 

 appearance. 



Section to Lloyd's cove. — Above the Indian Cove seam, there 

 is a continuous rock cliff almost to Lloyd's cove, a distance of 

 about two miles, and representing a vertical stratigraphical 

 height of 1125 feet, including 215 feet largely concealed, on 

 the east end. The argillaceous and arenaceous layers alternate 

 rather regularly, and contain a few thin limestones. The 

 approximate proportion of each is: — sandstone 316 feet, shale 

 534 feet, marl 36 feet, limestone 10 feet, Vjituminous shale 3i 

 inches, coal 16 feet, concealed 215 feet. 



To show the relative arrangement of these beds, a condensed 

 section of this part of the field may be of interest. Sandstone, 

 shale and marl are here grouped under the general term 

 " strata." Indian Cove seam, with its fossiliferous roof con- 

 taining Cytherea, etc., has been described. Above this the 

 section is as follows : 



