A NEW DINOSAUR. 
143 
fills in the body chamber ; but the earlier and sealed chambers contain coarsely 
crystalline calcite that rarely fills the whole space. Evidently the calcareous 
muds filled the large open cavities when the fossil was embedded, but was 
unable to gain access to the sealed cavities. Percolation of water at a later 
date through these calcareous beds has apparently been responsible for the 
deposition and crystallisation of calcite within the inner cavities of the fossils.” 
THE AGE OF THE BEDS. 
Dr. F. W. Whitehouse, Department of Geology, University of Queensland, 
and Hon. Palaeontologist on our staff, kindly contributes the following : — 
“ The matrix, as mentioned above, is typical of the Cretaceous beds of the 
Great Artesian Basin. These beds consist of a lower or marine suite and an 
upper or freshwater scries. The marine beds, the “ Rolling Downs Formation,” 
have been divided into two scries : — The Roma Series of Aptian age, succeeded 
by the Tambo series of Upper Albian age. 
“ Along the northern railway line from Hughenden almost to Cloncurry 
all the exposures are in beds of the Tambo Series. North and north-east of 
these beds, in the eastern portion of the region, beds of the Roma Series 
appear from below the Tambo Series, forming a marginal fringe to this part 
of the Cretaceous basin. Beds of this age, yielding Cretaceous ammonites, 
occur for example at Glendower Station (north-north-east of Hughenden) and 
Cambridge Downs (north of Richmond). No detailed mapping of the Lower 
Cretaceous horizons has been done in this area. ‘ Clutha.’ the locality for these 
fossils, although north of the railway line, from its position might be expected 
to be in the region of the Tambo Series. This is confirmed by the occurrence 
of other fossils in the matrix surrounding the bones. This has yielded 
Be.udantice.raa sp., and fragments of Inoceramus. Beuclanticeras is restricted 
to the Albian ; while in Australia Inoceramus is the commonest genus of the 
Tambo Series, but is almost entirely absent from the Roma Series. 
“ We may conclude therefore that the beds from which the fossils were 
obtained belong to the Tambo Series of Upper Albian age.” 
Mr. L. C. Ball, Chief Geologist, Queensland Geological Survey, has 
kindly drawn my attention to A. Gibb Maitland's traverses ( see G.S.Q. Publica- 
tion No. 121, published in 1898), as bearing on the stratigraphy of the locality. 
Maitland passed within a few miles to the north of ” Clutha ” over monotonous 
open downs entirely devoid of sections. 
Previous Records of Dinosaurs. — The only previous record of a 
Cretaceous Dinosaur in Australia is the report by Sir Arthur Smith Woodward 
of a “ tooth and a posterior caudal vertebra of a small Megalosaurian ” from 
“ the Upper Cretaceous opal-bearing sandstone of Lightning Ridge, near Walgett, 
New South Wales,” in 1909. 1 The same author described and figured “ an 
- vVoodwai'cl, A. Smith, Rsp, Brit. Assn., 1909, p. 482. 
