GEOLOGY OF THE JENOLAN CAVES DISTRICT. 333 



The Jenolan Caves form such an important tourist centre 

 and are visited by so mauy who are interested in geology, 

 that it will no doubt serve a useful purpose if the inform- 

 ation thus gathered together be now placed on record. 



The Jenolan Caves occur in the Parish of Jenolan, in the 

 County of Westmoreland, N.S.W., and are situated on the 

 Jenolan River a short distance from its source on the 

 eastern fall of the Main Divide. They are about thirty-six 

 miles from Mount Victoria, which is the railway station 

 from which visitors usually journey to the Caves, and from 

 which there is a splendid motor road. 



The scope of the present paper is limited to a description 

 of the geology and petrology of the country immediately 

 adjoining the Jenolan Caves, but in order to completely 

 solve some of the geological problems of this region, a 

 detailed examination of a much more extensive area would 

 be necessary, than we have had time or opportunity to 

 carry out. 



B. Previous Observers. 

 In 1892 Mr. R. Etheridge, Jr., 1 recorded the occurrence 

 of Pentamerus Knightii and other fossils in the Jenolan 

 limestone, and expressed the opinion that the geological 

 age approximated to the Aymesbury Limestone of England. 

 In 1896 Prof. T. W. E. David 2 in a paper on "Radiolaria 

 in Palaeozoic Rocks," gave a brief description of the geo- 

 logical features of the Jenolan Cave District with particular 

 reference to the occurrence of the radiolarian cherts. 



In 1911, one of us (C. A. Sussmilch) 3 contributed a pre- 

 liminary note on the geology of the Jenolan Caves District 



1 Records Geological Survey, N.S. Wales, Vol. in, part ii, 1892, p. 57. 



2 The occurrence of Radiolaria in Palaeozoic Rocks in N.S. Wales by 

 Prof. T. W. E. David, b.a., f.g.s., Proc. Linn. Soc. N.S.W., 1896, Vol. xxi, 

 pt. iv, p. 553. 



3 Note on the Geology of Jenolan by C. A. Sussmilch, f.g.s., Austr. 

 Assoc. Adv. Sci., 1911, p. 120. 



