330 APPENDIX. No. XV. 



the basement beds in both areas indicate a period of denuda- 

 tion, shallow water, or at all events erosion of coast-lines, 

 that no older fossiliferous beds are known, and that the 

 conglomerate or grit bed rests directly on the fundamental 

 rock. Silurian limestones continued to Cape Norton Shaw : 

 both in this locality and at Cape Barrow they contain a 

 numerous assemblage of fossils, described in a very exhaustive 

 report by Mr. Etheridge. 1 Amongst them may be mentioned 

 Favosites alveolaris, F. gothlandica, Favistella reticulata, 

 Halysites catenulatus, var. feildeni, Eth., Fentamemis 

 coppingeri, Eth. 



On the northern side of Scoresby Bay the extension of 

 the limestone ceases, and the more ancient Cape Kawson beds 

 rise to day. Whether the line of junction is a fault, or a 

 natural boundary, is doubtful ; of whatever character it may 

 be, it is certain that it traverses Kennedy Channel, and 

 reappears on the opposite coast in Hall Land, where its 

 situation is determined within narrow limits, trending from 

 Polaris Bay to Newman Bay. These beds outcrop on the 

 north side of Thank God Harbour, and there is an exposure 

 of Silurian limestones at Cape Tyson and Offley Island to 

 the south : from this point southwards to the great Humboldt 

 glacier, the Silurians form the rock of the country, by way 

 of Petermann Fiord, Bessels Bay, Franklin and Crozier 

 Islands, and Capes Constitution and Andrew Jackson. 



Dana Bay Beds. — Green slates associated with meta- 

 morphosed rocks belonging to the Cape Eawson beds are seen 

 on the slope below the carboniferous limestone on the neck 

 of Feilden Peninsula, but the boundary is doubtful, and may 

 be faulted. 



On the south side of the valley in Dana Bay, at the head 

 of Porter Bay, the carboniferous limestone is repeated by a 

 strike fault, and the base is not seen. 



A small exposure of fossiliferous beds was observed in a 

 torrent course, the fossils are referred by Mr. Etheridge to 

 the Devonian era ; but as the nature of the underlying rocks 



1 [ Journal Geological Soc.,' London, 1878. 



