SEDIMENTARY ROCKS OF THE LOWER SHOALHAVEN RIVER. 317 
Naturalist,’ but much additional data having been obtained, 
further conclusions arrived at are here placed on record. 
My indebtedness is due to Messrs. Youll, Blackmore, and 
Martin, who accompanied me at various times. To Mr. 
Blackmore, my thanks are particularly due for the trouble 
he took in obtaining photographs, and to Mr. Youll for his 
indefatigable assistance in the field. 
The Devonian fossils before collected, were very kindly 
named by Mr. W. 8S. Dun, Palzeontologist to the Mines 
Department. 
Previous Literature.—Literature on the district is very 
limited and chiefly confined to the comparatively small 
area covered by the Yalwal Gold Field. The Rev. W. B. 
Clarke’ in the sixties, touched on the main features of the 
district. Mr. H. C. Andrews, Geological Surveyor, did 
considerable work in the district, though his observations 
were more confined to the gold field at Yalwal.’ The 
Upper Marine Series, south of Nowra, were studied in 1890 
by Professor David,’and Messrs. Jaquet and Harper reported 
on the geology of Conjola in 1904.’ Practically no work 
has been done however in the study of the conditions under 
which the Upper Marine Series were deposited, of the 
relations of the various sub-divisions, one to the other, and 
of their fossil contents. 
Physiography.—The Shoalhaven River lies just beyond 
the edge and flows parallel to the plateau, which marks the 
southern limit of the great coal basin formed by the Upper 
or Newcastle coal measures, overlain by the Hawkesbury- 
* Volox, pt. 3, 1906. 2 Southern Goldfields. 
* Report on the Yalwal Gold Field, Geological Survey of N. S. Wales, 
Mineral Resources, No. 9. 
* Annual Report Department of Mines of N. 8S. Wales, 1890, Progress 
Report. 
* Records of Geological Survey of N. S. Wales, 1904. 
