REPORTS OF RESEARCH COMMITTEES. 3( *1 



likened to a nail wiih a large rounded bead. The IMain Juke^j and 

 Lake Jukes cirques are both of mature age, and are in reality com- 

 posite in character. At the head of the Lake Jukes cirque two 

 glacial lakes occur. 



On the south-eastern })ortion of Mt. Read a glacial cirque 



occurs, the basin of which is occupied by Lake Johnston. On the 



eastern side of Mt. Tyndal a cirque of large dimensions occurs, 

 which the writer proposes to name the Rolles'ton Cirque. 



Recently the writer has recognised a large cirque on the south- 

 eastern slopes of Mt. Owen. 



Professor W. N. Benson, D.Sc, has described three large 

 cirques on eastern and north-eastern sides of Cradle Mountain, in 

 a paper read before the Royal Society of Tasmania. Each is 

 characterized by the presence of a lake, named, respectively, Lakes 

 Rodway, Dove, and Grater. 



The moraines from the glaciers on the eastern side of the Jukes- 

 Darwin ridge have been definitely shown not to descend below 

 420 feet above present sea level. The Clark Valley, between Mts. 

 Darwin and Sorell, is a typical U-shaped glacial valley, and its 

 terminal moraines cannot be observed below an elevation of 700 

 feet above sea level. 



The moraines at Williamsford and Rosebery are not observed 

 to descend below 1,170 and 750 feet respectively.* 



The Gormanston moraine, in'the Linda Valley, has not been 

 observed below 800 feet. 



The extensive moraine in the Boco valley and plain has its lower 

 limit at the 1,200 feet contour. (Geol. Surv. Tas., Bull. 28.) 



Pi-ofessor Benson's obseTvations show that the moraines in the 

 vicinity of Cradle Mountain do not extend below the 2,900-feet 

 contour. 



A. Mcintosh Reid has recognised a glacial valley running north- 

 westwards from the valley of the Macintosh River towards the 

 Boco plain. The present maximum height of the glacial erratics 

 is 1,700 feet, and the terminal morraine, as indicated above, does 

 not descent below 1,200 feet. (Geol. Surv. Tas., Bull. 30.) 



(lencidl Ohxerrnfions. 



The geneiral impression that has been formed as the result of 

 these observations as to the location of the glaciers and their 

 moraines is that there did not exist, at least on the West Coast 

 range, a sufficiently extensive and continuous area of ice which 

 coufd be termed an ice-sheet. The ice seems to have been restricted 



* Geol. Surv. Bulls., Tas., 19 and 23. 



