132 
Feet. 
15 
15 
10 
12 
35 
12 
10 
35 
Blitisli calcareous shales, witli Lepidodendron — west brancli of Sandy 
20 
332 
Creek 
(jap 
Grits and conglomerates — Horse Creek and MU to south, Dinner 
300 
Creek and Little Star Biver 
Total 
... 1,353 
White sandstones, pebbly grits, and conglomerates of considerable thickness, 
belonging to the Star Beds, overlie the mica-schists and slates of the Argentine Silver 
Field” They are inclined at comparatively low angles, and form cappings on the higher 
hills of the district such as Camp Hill, Ben Lomond, and the hiU lying between the 
Bonanza and Caroline Alines.* The section (PI. 54, fig. 1) shows the relations of the 
sandstones, &c., overlying the silverfield to the Star Beds, as developed in t e ype 
district, and to the underlying rocks. It will be observed that the Star Beds some- 
times overlie the slates and schists of the silverfield, and sometimes rest directly on 
^ In my Handbook of Queensland Gcology,t I described, under the name 
of the “ Dotswood Beds,” a series of strata largely developed in the valleys 
of the Fanning and Keelbottom, which I then believed to succeed the Fanning 
(Burdekin) Limestone (Middle Devonian), conformably. To this horizon I referred 
the plant Bicranophjllum australicmn, Dawson, occurring in a bed of sandstone 
immediately, and conformably, overlying the Fanning Limestone. I have since as 
already stated, ascertained that the Fanning and Burdekin Limestones are succeeded by 
a great thickness of strata belonging to the same period (Middle Devonian), to whic ■ 
have therefore relegated the plant in question. Aloreover, I have since foun(i m the 
“ Dotswood Beds,” as originally described, an abundant series of fossils which leave no 
doubt that the “ Dotswood Beds ” are identical with the “ Star Beds,” or at least are 
part and parcel of the same formation. ,, i n t> j. 
In Keelbottom Valley, near Dotswood, the strata of the so-called Dotswoou 
Beds ” dip to E. at 30°, and form a series of ridges across the valley. Taking into 
account the high dip and the extent of ground occupied by the outcrop of the strata, 
they must be some thousands of feet in thickness. Beds of brown felspathic sandstone 
alternate with conglomerates and red shales which are marked conspicuously with white 
spots The conglomerates contain pebbles, up to six inches in diameter, the majority o 
which are of pink porphyry, a few being of hardened white sandstone or quartzite. 
The porphyry pebbles, as well as the felspathic sandstones and the gritty felspathic 
matrix of the conglomerates, clearly prove that the deposit was derived, as a whole, 
from the waste of volcanic or metamorphic materials. It bears a striking resemblance 
to the Lower Old Bed of Perthshire, Scotland. 
Map attached~to Report by R.L.J. on the Argentine (Star) Silver Mines. Brisbane : by 
Authority : 1886. 
t Brisbane : 1886. 
