THE GLACIAL BEDS OF LITTLE PEPPER- 

 MINT BAY, TASMANIA. 



A Paper read before the Royal Society of Tasmania by Professor 



E. G. Hogg, M.A. 



Little Peppermint Bay is a small arm of the sea on 

 the western side of D'Entrecasteaux Channel, abont 27 

 miles south of Hobart. The nearest point at which the 

 Channel steamers call is Woodbridge, or Peppermint Bay, 

 about half a mile south of the beds described in this 

 paper. 



The prevailing beds in the locality belong to thePermo- 

 Carboniferous series, and have, over a large area, a fairly 

 uniform dip to the S.E., at about an angle of 30^. They 

 are intruded into by two distinct types of igneous rocks, 

 viz., the Oyster Cove porphyries and the diabase green- 

 stone, and, near the contacts, are disturbed to a considerable 

 extent. 



The glacial beds are exposed on the beach at the 

 western part of Little Peppermint Bay, along the new 

 and old roads from Woodbridge to Kingston, where they 

 cross the Little Peppermint Bay Creek, and may be 

 traced along the course of the creek for over half a mile. 

 The greatest height at which they are found above the 

 sea-level is about 200 feet. This occurs at the most 

 westerly point at which they can be traced. The rock in 

 the neighbourhood at this spot is the felspar porphyry, but 

 no contact could here be found to determine the relations 

 of the glacial and the igneous rocks. 



The glacial beds are composed of an extremely tenacious 

 fine-grained matrix, in which are embedded boulders, 

 generally of small size, for the most part rounded, and 

 frequently striated. Photographs of some of the striated 

 stones are appended to this paper. No boulders to which 

 the term massive could be applied were found ; in fact, no 



