I9I4.] CONCEPTION AND TRINITY BAYS, NEWFOUNDLAND. 423 



as infrequent disseminations and individual platy crystals and prob- 

 ably once formed the Hyolithcs-l'ik& rods now replaced by chlorite 

 and a carbonate. Pyrite and hematite are found. The nodules of 

 this bed, subspherical in shape, show under the microscope a compact 



Fig. 40. View of the manganese beds (a) dipping into the sea on the 

 east side of Brigus South Head. 



structure and an almost impalpable fineness of grain. Under crossed 

 nicols an occasional angular fragment of quartz is found but the 

 groundmass as a whole appears to be isotropic. It is possible that 

 these pebbles are analogous to the phosphate pebbles of Manuels, 

 Topsail, and Long Pond. 



