Xll 
From fossil evidence obtained from artesian l)ores in the North-western 
District of New South Wales, there can he little doubt that the Triassic Coal 
Measures are continuous under the Cretaceous rocks from Moree to the South 
Australian border (a distance of between 500 and GOO miles) or even further. 
It is dilTicult, therefore, to realise that there can he, as stated by Dr. Jack, an 
unconformability between the two series, and it appears probable that the 
evidences of unconformity, observed by him in Queensland, were merely local, 
and were due to contemporaneous erosion of the Upper Triassic l)eds. It 
seems more reasonable to assume that the Triassic Coal Measures and the 
Cretaceous beds form parts of a continuous series, and that they succeeded 
one another regularly without marked break ; that the depression in which 
they were laid down extended from the Gulf of Carpentaria southwards to the 
Darling River and was subject to alternations of elevation and subsidence, so 
that it became by turns a freshwater lake or an inland sea. 
EDWARD E. RITTMAN, 
Government Geologist. 
Sydney, 29th September, 1902. 
