124 Coal- Seams of Van Diemens Land. 



From Prosser's Plains to the Bay, the road follows the 

 course of the river through a narrow defile, crossing and 

 recrossing the river several times in a few miles. 



With the exception of one point ahout eight miles from 

 Spring Bay, where the fossiliferous limestone crops out, the 

 entire distance is occupied by massive crystalline green- 

 stones, rising on either hand into high ridges and abrupt 

 escarpments. This extends to the N.E. corner of Prosser's 

 Bay, where we again come on the coarse, gritty, yellow, and 

 white sandstones of the carboniferous series ; and these 

 extend uninterruptedly to the Township of Triabunna on 

 the north-east side of Spring Bay. 



3.— SPEING BAY AND THE TOWNSHIP OF 

 TEIABUNNA. 



The vertical sections, PI. II., figs. 1, 2, 2>, 4, are drawn 

 from data furnished by Mr. Vicary. 



The works are all abandoned for the present, and the 

 shafts full of water. I was, therefore, unable to examine 

 any of them. 



As I had no map of the locality, the plan is merely a 

 sketch of the surface, in which I have attempted to show the 

 position of the difierent workings, and the general relation 

 of the beds as seen on the surface. 



The shaft marked D was the first work executed, and was 

 sunk with the intention of cutting the 3j-foot seam of coal, 

 which is seen cropping below high-water mark on the west 

 bank of the estuary, and which but for the existence of the 

 fault A B, of which the parties do not seem to have been 

 aware, would have been successful. Owing to this circum- 

 stance, however, they sank and bored two-hundred feet in 

 beds immediately underneath the crop of the coal, and which 

 are exposed to view on the surface to the south along the 



