SEDIMENTARY ROCKS OF THE LOWER SHOALHAVEN RIVER. 323 
water in origin, and can therefore hardly be said to belong 
to the Upper Marine Series, the Permo-Carboniferous rocks 
of the district are confined entirely to that formation. From 
Nowra to Yalwal Creek they fall naturally into a threefold 
subdivision. Further to the south a similar division occurs. * 
To avoid duplication of names it is here proposed to retain 
the local names applied to the various formations further 
south, for the several series discussed. It is probable that 
the mudstones at Burrier, the sandstones of Grassy Gully, 
and the grits of Yalwal Creek, are connected with the 
Wandrawandian sandstones, and are only their western or 
north-western extension. The topmost members of the 
Upper Marine Series are the Crinoidal Beds, which are 
well developed on Cambewarra mountain. For purposes 
of convenience I have also made a horizontal division in 
two of the series, owing to the different characters and 
fossil contents of the same formation in different localities. 
This will be best seen on studying the section. The names 
however are oi a purely local nature, and it is not intended 
that this nomenclature should hold good elsewhere. 
Sub-Division I—The Conjola Beds. 
These beds are probably of the same age as the extensive 
series at Conjola, though formed under different conditions. 
However it is the nature of these conditions which makes 
me incline to the view that the freshwater beds, though 
containing Glossopteris, are yet of later age than, and there- 
fore were formed when the Clyde Coal Measures further 
south had already been submerged. 
+ Professor T. W. E. David, Progress Report, Annual Report Depart- 
ment of Mines of N.S.W., 1890. The following subdivisions of the Upper 
Marine Series are made south of Nowra:—(1) Nowra Grits, (2) Wandra- 
wandian Sandstones, (3) Conjola Beds. The second formation is described 
as consisting of dark grey mudstones with abundant fossils, which have 
the original shell matter preserved, and with a thickness of 550 feet. The 
Conjola Beds consist of sandstones and conglomerates with a thickness 
of 1,400 feet, and coatain a strongly carinated Meonia in abundance. 
