115 
®Wking ; kut in nature they are more remarkable still. They can be followed from hilltop 
° hilltopj forming at times rough insurmountable walls a hundred feet in height 
for example, in the peaks west of Mount Tenison "Woods. In other places denuda- 
has left their remains on hillsides or hilltops in the form of huge cubes of hard 
•Itiartzite, from which tho surrounding softer rocks have crumbled away. These cubes 
j. Up Weird and solitary, like the “ iierched blocks ” of Alpine and Arctic lands. Tho 
Wear persistence of the veins in question is very remarkable. One, for instance, has 
ftaced (with a few breaks) from Mount McGann to the head of Tyrconiicll Creek, 
^ ^ istance of over six miles. The two veins intersecting Mount Eobert have been 
° iowed for four miles each. Tu those and many other cases the tracing of the veins 
abandoned for no other reason than that the limit of the map had been reached, 
^ttiilar veins, it may be hero observed, have been noted by the Writer in the Cloncurry 
th*^ ^^^'^^ihurdt region, where they attain still more gigantic propoi’tions. The veins of 
® Cloncurry and Ilodgkinson resemble the dolerite dykes of Scotland and Ireland 
than the ore-charged reefs of Australia. The Hodgkinsou veins, I have been 
contain rare and minute quantities of gold. I have not been able to verify 
^ information, and suspect that the gold may have come from reefs adjacent to the 
Specular iron ore, brown hmmatite, and binoxide of manganese are not uncom- 
^ y found in the cavities of the larger veins. 
^ In a conglomerate on tho hillside, opposite the Glen Mowbray Machine, there 
th'^'o large oval pebbles or shingles of black shale. The shingles strongly resemble 
Graptolite Shales of Victoria and the Uplands of the South of Scotland. But they 
<initc iindistinguishable from tho beds of dark shale which lie beside, and 
^Sieally both above and below, the conglomerate bed. I split open a great number 
Uu 1 ^ shingles in search of graptolites, biit without success. They yielded instead a 
® Gr of reed-like plant-impressions, invariably too indistinct for determin.ation. 
^^ear the northern boundary of the township of Thornborough is the Chance 
th 
Uriel, dljjg locality is about a mile south of the conglomerate in Glen Mowbray, and 
, ® strata 
“^^Wthatof the . 
^luonly but improperly known as slates), with alternations of hard, gritty grey 
cut in tho tunnel occupy a horizon which may be estimated at 4,620 feet 
conglomerate. They consist for the most jrart of dark-blue shales 
and a few bands of fine conglomerate. The fine-grained greywackes yielded a 
''’aeki 
« . -W ,, 
Q snake,” which was sent to the Queensland Museum, and pronounced by Mr. 
• de Vis to be a Lepidodendron, probably L. austmle, McCoy.* 
f^ui-wards, 
-C/i 
I visited tho spot 
. and saw some flattened stems and twigs, which may have belonged to 
^isit f>nt from which all the characteristic markings had disappeared. My 
artjojiff ‘luubt on my mind regarding the bona jides of the discovery. I found 
plant” ®liales numerous casts of crustacean or molluscau tracks, some reed-like 
^^P’’u®®jons, and a fragment of carbonised wood. 
Gl^jj , if the shale pebbles or boulders or shingle (as the case may be) of the 
I sho 1 or other similar conglomerate should in future yield recognisable fossils, 
'vhipu'^ neces.sarily regard tho fossils as “derived” from some older formation 
'ucn bad ’ 
de 
-position nf +1. ‘ 
P^’actipaii ^ conglomerate. 
Iieen upheaved and subjected to denudation during the period marked by the 
shi 
leally 
llornfaj.-* have been derived from a bed of shale which formed a part of the same 
sha^' 1 experience nothing is more certain than that fragments of a 
Contemporaneous I 
On the contrary, I should believe the fossils to be of 
I believe the plant-remains of the Glen Mowbray 
bed wiil be found in any succeeding bed of conglomerate. Tho ex])lanation 
®uice been confirmed by iny Colleague, who was allowed, by the courtesy of Mr. De Vis, 
specimens in the Queensland Museum, 
