1914-] CONCEPTION AND TRINITY BAYS, NEWFOUNDLAND. 429 



manganiferous dolomitic ferruginous shale. The bed is somewhat 

 massive and nodular though the nodules are very irregular as com- 

 pared with those at Manuels and other localities ; irregular crystal- 

 line areas form the nodular portions while the matrix is made up 

 of more argillaceous matter. Thin sections taken from the bottom 

 and central portions of the bed were examined microscopically. 



Fig. 45. Exposure of manganese ore, 230 D27, on the Broad Cove shore, 

 near Smith Point, Smith Sound. This is a nodular ferro-manganese carbo- 

 nate-oxide bed. 



230 D 27aa is a reddish nodular and o51itic shale, with hematitic 

 carbonate making up the greater portion of the determinable 

 minerals ; aggregations of a fine-grained dark material suggest phos- 

 phatic nodules so common in the Manuels occurrence. Irregular 

 grains of quartz and aggregations of chlorite are found. Sections 

 of trilobites and other organic forms containing carbonate material 

 abound. Some hydrous manganic dioxide occurs (Fig. 47, Slide 

 299) . Sections from the middle portions of the bed, 230 D 276, 

 show a somewhat massive, nodular or oolitic reddish rock. Hema- 

 tite is found as a pigment and to a lesser extent as lustrous opaque 

 grains to which the color of the rock is due. A manganic oxide 

 occurs as irregular and infrequent grains. Carbonate occurs as 

 vein filling, as irregular areas, or as replacements of sponge spicules 



