Glacial Beds at Wynyard, Tas7)iania. 31 



These are like dense basalt, and show clusters of dark-colored 

 crystals, probably augite. 



The included rocks vary in size from mere gravel to blocks of 

 granite, quartzite, and sandstone, several tons in weight. One of 

 these granite blocks may be seen embedded in fine sediment in 

 Freestone Cove, and large blocks of highly-jointed quartzite occur 

 in the uppermost portion of the bed on the north-eastern point of 

 Sandy Cove Bluff. Small pieces of these quartzites are observable 

 in the immediately-overlying Eocene derived conglomerate. 

 Veins of calcite up to several inches in thickness traverse the 

 glacial beds in various places. 



Fossils have been found in some of the pebbles of the glacial 

 conglomerate. They have heen described^ by Mr. Robt. 

 Etheridge, jun., as Silurian types, comprising Pentamerus 

 tasmaniensis, R. Etheridge, fils; Spirifer, 3spp. ; Strophomena (?); 

 Tentaculites; Orthis; and Atrypa (?). No fossils, however, of 

 contemporaneous age have been noticed in the glacial deposits, 

 as has already been pointed out by Messrs; Stephens and 

 Montgomery. 



Mr. Stephens has described^ these Wynyard conglomerates 

 as follows: — "The horizontally bedded conglomerates and breccias 

 of very variable character and uncertain age which occur at 

 intervals between Port Sorell and Table Cape appear to come 

 next in geological order, but may belong to the last-named series 

 of rocks " (the Mersey Coal Measures ot Permo-Carboniferous 

 age). "... At the mouth of the Inglis .... large angular 

 blocks of granite and porphyry, the former sometimes weighing- 

 several tons, together with rolled pebbles of many of the Primary 

 rocks, are here seen embedded in a fine-grained mudstone, this 

 being evidently derived from the denudation of some of the softer 

 slates, and deposited as mud on the margin, or in the bed of some 

 ancient river or estuary, which occupied a basin with nearly the 

 same principal boundaries as the modern Inglis. These massive 

 blocks of granite and other x'ocks, which are not now found 

 tfi situ within several miles of their present position, I consider to 



1 R. Etheridge, jun. : Description of Remains of Trilobites from the Lower Silurian 

 Rocks of the Mersey River, and Brachiopoda from the Conglomerate of Table Cai)e— Proc. 

 Roy. Soc. Tasmania, 1882. 

 2 Loc. cit. 



