248 



Notes on the Geology of the moorlands (South 

 Australia) Brown Coal Deposits. 



By A. C. Broughton. 

 [Read October 13, 1921.] 



Carbonaceous shales and lignitic material were located 

 in a well sunk by Mr. Turner in the Hundred of Sherlock, 

 about the year 1907, situated about 100 yards east from 

 the Hundred of Seymour and 2,500 yards south from the 

 Hundred of Hooper. 



Several attempts were made to determine the extent of 

 the formation, and investigations were carried out with a 

 view to its utilization. It was not until the early part of 

 1920 that systematic and extensive work was undertaken 

 to thoroughly test the locality. This is now being done by 

 a private company — the Tailem Bend and Murray Coal 

 Company — as well as by the South Australian Government. 

 The results are made the subject of the present notes. 



The area is being tested by bores every 300 yards, and 

 where results justify every 150 yards, or closer. By this 

 means very complete geological sections may be obtained. 

 In the case of the company's bores, cores were collected every 

 few inches from the surface to bed rock. The South Aus- 

 tralian Department of Mines has a calyx drill working on 

 this area, and the cores obtained by this drill are analysed 

 by the Department. To date (September 18, 1921) the com- 

 pany has sunk 73 bores and the South Australian 

 Government 20. 



The following four particular bores will indicate the 

 method of tabulating the records. The first three, i.e., 

 Bores A, B, and C, were sunk by the company, The fourth, 

 D, shows how the coal is analysed, as the figures have been 

 made available by the South Australian Department of 

 Mines. The analyses were made by Mr. W. S. Chapman, 

 of the School of Mines and Industries : — 



Bore A. 



Surface sand ... ... ... ... , 



Travertine limestone 

 Pale-green and dull yellow-brown sand 

 Hard compact limestone ... 

 Pale-green clay, inclined to be arenaceous 

 Dull-yellow arenaceous clay, pale-green 



clay, yellow sandstone ... ... ... 2| 16 



Thickness. 



from 





Surface. 



Ft. 



Ft. 



... 3 



3 



... 2 



5 



... 3 



8 



... 4 



12 



is U 



13± 



