3G 
Here the clip is to the west at 25°, and as the outcrop occupies a belt of four miles in 
breadth, the total thickness of tlio limestone beds must be nearly 7,000 feet. From 
the limestone near the Old Station I obtained, besides Corals, a few specimens of 
Brachiopoda. A calcareous shale immediately above the limestone yielded, in addition 
to corals and mollusca, the only plant — Dicrano])h^lluni australicum, Dawson — yet 
found in the Devonian rocks of Queensland. 
The ring of limestone underlies a basin of stratified deposits, consisting for the 
most part of grey, brown, and greenish flaggy sandstones, and greenish and chocolate- 
coloured shales. A few oE the sandstone beds are white, and ivould be well suited for 
building purposes. From one of the.so white beds I obtained the specimen of 
Dicranopliyllum atistralioum which was described by Sir J. William Dawson. 
In the limestone of the scrubby hills above referred to are several large caverns, 
beautifully festooned with stalactites and stalagmites. 
The Broken Elver falls into the Clarke Eiver, one of the most important 
tributaries of the Burdekin, in Lat. 19° 30' S. and Long. 145° E. Mr. Daintree, in 
his Paper on the “ Geology of Queensland,”* wrote “ On the track from the Broken 
Eiver to the Gilbert Diggings, Devonian rocks, several thousand feet thick, may be 
observed, as they are continuous in dip, without being repeated, for at least five miles 
across the strike, with an average inclination of G0° .... On the Broken Eiver 
and its tributaries a breadth of thirty miles, with a length nf sixty miles, is occupied by 
a persistent outcrop of Devonian strata There the entire Devonian system, 
as developed in Queensland, could be easily and satisfactorily mapped. The branches of 
this river cut right across the strike, and the bare edges of the rocks arc often exposed 
over the intervening ridges from creek to creek. Well-marked beds of interstratified 
conglomerates seem to retain their character over large areas, and the loose pebbles 
from these can be followed readily over the ridges, whilst the rock from which these 
pebbles are derived crops out in the gullies aud ravines.” 
I had an opportunity of visiting this interesting locality in October, 1886, and 
traversed the river for about ten miles above the cros.sing of the road from Pcntland to 
Gilberton. The strata strike north-east and south-west, and dip on the whole at high 
angles to the north-west. In the first mile above the crossing there is, however, first a 
synclinal trough and then an anticlinal arch, so that the outcrops of some of the strata 
are seen three times. Allowing for this repetition, the following section (in descending 
order) can be made out : — 
Feet. 
1. (Ten miles up the river.) Hard .grey or white and yellowish sand- 
stone, sometimes weathering spheroidally, alternating with 
soft, thin, grey shales ... ... ... ... ... 5,280 
2. Soft, thin, grey shales (vertical; strike N. 35° E.) 1,000 
•I. Soft, grey, sandy shales or argillaceous sandstones, sometimes 
calcareous, and containing Corals, Crinoids, and Bracliiopods 
(nearly vertical ; strike N.E. and S.W., marked cleavage- 
pilanes, dipping to H. at 15° to 25°) 
... 1,000 
Ho section — room for 
... 300 
4. Limestone (strike H.N.E. to S.S.W. — traced for two miles) 
... 300 
5. Shales 
... 500 
6. Fine conglomerates 
... 200 
7. Limestone 
50 
Carried forward 
... 8,630 
Quart. Jonrn. Geol, Soc,, vol. x.xviii., pp. 290, 291. 
