59 



and for the most part occupy inconspicuous and low positions. 

 The only exception occurs about five miles eastward from the 

 settlement, where two parallel strips of clay-slates occur, 

 perched on the granite base, and culminating in hills about 

 1,000 feet in height. An area of about five miles in length, 

 and four in breadth, is chiefly occupied thus by clay spates 

 and sandstone ; these are traversed by thin quartz strings, and 

 occasionally by veins of quartz of tolerable dimensions. 



Other outliers of slatey rocks occur on Badger Island, occu- 

 pying about one half of it ; upon the shores of Franklin Inlet 

 adjoininj^ Adelaide Bay, upon the north side of Cape Barren 

 near Deep Bay, and at Cape St. John. 



These have hitherto proved barren in metals with 

 the exception of pyrites veins. And their chief in- 

 terest is derived from the proof which they offer of 

 the continuation northward and eastward of the great 

 system of anticlinal and synclinal folds, which I have at various 

 times shown before this Society to pervade and completely con- 

 trol the disposition of all the oldest formations in the colony. 

 Thus we may readily conceive the outliers at Brougham's 

 Sugar Loaf, and at Badger Island, and Cape St. John, 

 to be on the respective slopes, if the expression is intelligible, 

 of the anticlinal axis whose continuation traverses the main 

 land south of Waterhouse Point, in the direction indicated on 

 the chart, while the outlier fronting on the Franklin Inlet 

 may show a continuation of the line of flexure on the extreme 

 east of the colony, passing through Mt. William and the 

 Scamander tier. 



Trap rocks are exceptional altogether among the islands, 

 hut occur to a limited extent, and most unexpectedly in a 

 few widely separated spots, either in the form of narrow 

 dykes traversing the granite or of overflows of basalt— such 

 as those marked at Killicrankie Bay, and in the nei _ hbourhood 

 of Mount Eliza and Sanfra Island ; these are chiefly compact 

 hard basalts, but on the surface vesicular and zeolitic. 



The following is a list of minerals met with by myself, or 

 reported to me, as occurring among the islands, to which I hay© 

 appended the localities and the formation in which they 

 occur : — 



1. Gold was obtained by me in traces on Cape Barren Island. 

 None whatever was found on any part of Flinders, and the stories 

 current as to the discovery of gold there have not been sub- 

 stantiated. It is almost needless, however, for me to add that it 

 is always possible that some may be discovered iu the Silurian 

 outliers near Brougham's Sugar Loaf, but the general aspect of those 

 rocks is certainly unfavourable. 



2. Copper Ores. — Stains of copper ore are said to occur on Pruin, 



