397 
The Eev. T. W. Eamm, in 1885, presented to the Geological Survey Collec- 
tion, a Ce 23 halopod iroin the Pliuders Elver, near Ilughendcn, which I took 
for Orthoeeras, but which my Colleague now identifies with Belemnites Selheimi, 
Ten. AYoods. . j i- i. 
The extracts above quoted appear to exhaust the stratigraphical and litho- 
logical information recorded by former writers on the Eolling Downs Eoimatiou, and 
I now add what I have myself observed in various traverses of the AYestern District. 
From the junction of Julia Creek with the Cloncurry north-westward to Gregory 
Downs, the strata of the Eolling Downs Formation can be traced. 
At Kamilaroy, on the Leichhardt Eiver, and the “ Grass Guuyah,” twelve miles 
south-west of Kamilarov, are extensive outcrops of magnesian limestone. At Kainilaroy 
the limestone yielded s'pecimeus, among which my Colleague recognised Belemnites- 
Otodus apendieulatus, Agassiz ; vertebra) of a Teleostean fish ; and a posterior costal 
plate of a Chelonian. 
On the Leichhardt, nine miles from the mouth of Gunpowder Creek, another 
limestone yielded Belemnites, a portion of the tooth of Lamna, and A:ucella liuglien- 
denensis, Eth. 
Eunuing up the Gregory Eiver, PalsBozoic rocks occupy the greater part ot the 
distance from Gregory Downs to the mouth of the O’Shanassy. Carl Creek Police 
Station is situated on the right bank oE Carl Creek, a fine rushing stream, which leaves 
the Gregory and runs into the O’Shanassy. Behind the barracks is a large open plain 
bounded on the south by cliffs of a hard yellow limestone, horizontally bedded. 
limestone evidently oceupies an ancient depression, and overlies (iiuconformably) 
nearly vertical Paleozoic sandstones, &c. The summit of this limestone forms a plateau 
which extends to Eocklands under the name of Barkly’s Table-land. The occurrence 
of Tellina on Barkly’s Table-land has already been noted. 
On tlie Upper Elinders, eighteen miles ISh 29° W. of Coalbrook Eailway 
Station, on the Northern Eail way, the Eolling Downs Formation is seen beneath the Desert 
Sandstone. The uppermost beds scon are soft crumbling dark-grey shales, about sixty 
feet in thickness, with bands of red ferruginous sandstone or arenaceous ironstone and 
grey limestone. Thence, down to the level of the river, are seen about ten feet of dark, 
fine-grained, felspathic sandstone. The surfaces of the sandstone beds in the river are 
ill ptlaces cov ered with obscure markings suggestive of the tracks of gigantic reptiles. 
The beds of the Eolling Downs Formation seen in this section, although nearly hori- 
zontal, undulate slightly, but their general tendency is to dip down the river, while the 
Desert Sandstone remains horizontal, thus affording a new instance of the uncontorm- 
nbility observed elsewhere between the two formations. The shaly beds of the inferior 
formation, with their bauds of ironstone and limestone, bear a close resemblance to the 
portion of the Eolling Downs Formation exposed in the neighbourhood of Hughenden. 
^ few hundred yards up the river, the rise of the strata exposes beds on a lower horizon 
than those above described. These are thick-bedded sandstones, partly of felspathic 
fiut mainly of siliceous materials, varying into grits, pebbly grits, and conglomerates 
About two miles further up the river the following section is seen on the ie.t 
hank : — 
Section No. 1. rt m 
(a) White gritty and pebbly sandstone ^ 
{l>) Laminated grey micaceous clay ^ 
(e) Coal „ .9" 
(d) Fine-grained brown siliceous shales, with plant-remains 
