121 



Borda. Part of it, called tHe Freestone Eange, is by contrast 

 %ritli the rest of the island bold and picturesque, and is clothed 

 with timber. Mount McDonnelMs 9S-1: feet eleTation : from 

 this point the general elevation falls to the westward, though 

 the heights bv the sea coast still maintain considerable altitude, 

 such as between Middle and "Western Eivers at 65S, Cape 

 Forbin 560, Cape Borda 506. Between the two watersheds 

 there intervenes the valley of the Cygnet Eiver, which, after a 

 course of 40 miles, enters Xepean Bay. It has its source in 

 several lar^e lagoons. Excepting the .Stun' sail-boom and rivers 

 to the westward of it, none of the watercourses on Kangaroo 

 Island are perennial. 



G-EOLO&T. 



From personal observation. I classify the rocks as in-iicated 

 by the subjoined table : — 



TEETIABT. 



1. Eecent sand-dunes. Lacustrine deposits. 



2. Pleistocene. Calciferous sand-rock of the south coast and 



marine beds. 



3. Pliocene. Pluvial drifts. 



4. Miocene. Bryozoal limestone of Boll's Point. 



PALEOZOIC. 



5. Diorite and intrusive granite. 



6. Pre- Silurian schists and associated strata. 



Peron had notified the presence of Xo. 6. Xo. 4. Xu. 1 and 

 Xo. 2, about which last he devotes several pages to the con- 

 sideration of its origin, and that of the petrified re main s 

 entombed in it. 



Mr. Brough Smyth, in his Geological Map of Australia^ 1875, 

 colours Kangaroo Island to represent Tertiary, except the 

 eastern half of Dudley Peninsula, which is shown as Silurian. 

 I know not whence he derived his information, but. like that 

 for much of our province, it is very erroneous. Had Peron been 

 consulted, such adverse criticism would have been uncalled for. 



Pee-Silubiax Schists. — ^As correctly observed by Peron, 

 Kangaroo Island " is composed essentially of different kinds of 

 primitive schists, between which are found some veins of opaque 

 quartz. All the eastern part of Bougainville Bay Xepean 

 Bay] is principally composed of a red and very hard ferrugin- 

 ous sandstone : it is to this singular rock that Kangaroo Head, 

 Cape Geographe, Bed Cape and Vendome Cape owe the reddish 

 and sombre tint which distinguishes them from afar A primi- 

 tive sandstone, quarrzose and very compact, forms some parts 

 of the coast." The prevailing rock is a mica schist, which is 

 displayed in magnificent sections along the north coast of 



