252 PROCEEDINGS OE THE GEOLOGICAL SOCIETY. [Nov. 30, 



features of the district. These are preserved in the library of the 

 Society, only one of them being now published. 



Sketch No. 1, illustrative of the geology of the northern shore of 

 Auckland Harbour, is here lithographed as Plate XIII., in which 

 the different volcanic soils are indicated by lighter and darker tints. 



Sketch No. 2 is a view of Manukau Harbour, from Pahakura, 

 looking west. No. 3. Mount Richmond (No. 25 on the Map) and 

 the neighbouring hills and craters. No. 4. Manukau Entrance. 

 No. 5. Tarang'a, or " The Hen," and neighbouring rocks. No. 6. 

 Barrack Hill and Mount Eden. No. 7. Castle Hill, Coromandel Har- 

 bour. — Editor Q. J. G. S. 



3. On the Geology of a part of South Australia between Adelaide 

 and the River Murray. By T. Burr, Esq. 



[The following is an abstract of the second of two Reports on the Geology of 

 South Australia, by Mr. T. Burr, communicated by the Colonial Office in 1847 

 and 1848. In the first Report were described two sections traversing the coun- 

 try higher up to the north (one in the latitude of Mount Remarkable, 32° 44' S.; 

 and the other in that of the Burra Mines, 33° 41'). The chief points treated of 

 in the Reports have been published in some detail in a little book entitled, " Re- 

 marks on the Geology and Mineralogy of South Australia," by Thomas Burr, 

 Esq., Deputy-Surveyor-General of the Province : Adelaide, 1846.] 



The lowlands about Adelaide on the west and along the River 

 Murray on the east consist of horizontal beds of limestone and cal- 

 careo-siliceous deposits, yellowish and reddish in colour, full of 

 marine fossils, and of Tertiary age. Sometimes gypsum and ferru- 

 ginous sand replace the limestone. These plains are arid — except 

 where granite protrudes from the surface, presenting cavities in 

 which rain-water collects. The author observed a similar Tertiary 

 formation on Yorke's Peninsula, at Port Lincoln, and to the S.E. to 

 beyond Rivoli Bay ; and it probably forms vast tracts in New South 

 "Wales and "Western Australia. None of these Tertiary districts 

 appear to exceed an elevation of 300 feet above the sea. 



In describing two volcanos in South Australia, Mount Gambier 

 and Mount Schanck, Mr. Burr remarked that, coming from the west 

 or north-west, at about 20 miles from these hills a white " coral 

 limestone " [Bryozoan limestone] containing flint or chert takes the 

 place of the limestones and calcareous sandstones with recent sand- 

 formation previously passed over. This white limestone is remark- 

 able for the numerous deep, well-like water -holes in it, within about 

 twelve miles of the volcanic mountains, and about east or west of 

 them. 



Mount Gambier has a height of 900 feet above the sea (600 feet 

 above the plain), and has three craters lying- nearly east and west 

 and occupied with lakes of fresh water. Mount Schanck, at a distance 

 of about nine miles magnetic south, is circular and has one large and 

 two small lateral craters. 



