22 
A. GIBB MAITLAND, F.G.S. : 
the other rivers further to the north. The Wooramel 
Permo-Carboniferous Rocks pass beneath what are believed 
to be strata of Jurassic Age, somewhere in the vicinity 
of the Errabiddy Hills, in the watershed of the Murchison 
River. 
The Glacial Conglomerate in the Irwin River. 
The Permo-Carboniferous Rocks do not make their ap- 
pearance again until the Irwin River valley is reached, about 
180 miles to the south of the Wooramel (Plate I). These beds 
occupy a fairly large area in the valleys of the Rockier and 
the Irwin Rivers, and the upper portion of Ivockatea Creek, 
but the northern extension of the beds lias not as yet been 
very accurately defined. The strata present an uninter- 
rupted series of shale, clay, sandstone, with occasional 
limestones, which are arranged in a very broad anticlinal 
fold, the axis of which trends generally north and south. 
As is the case in Kimberley anrl the Gascoyne, it seems 
possible to divide the strata into two distinct parts, viz., 
the lower, the limestone, and the upper, the sandstone series. 
The sandy series is well developed in the vicinity of Min- 
ginew, where, close to the railway line, are a series of fer- 
ruginous sandstones, which remind one very forcibly of 
the sandstone series as developed in the Kennedv Range, 
on the Lyons River. The Minginew beds have yielded the 
following fossils : — Dielastna nobilfa, sp. nov. ; Spirifera, 
sp. ind. ; Spirifera avicula, G. B. Sby. ; Cyftina carbonaria, 
var. Australica, eth. fil, ; Cleiothyris Macleayana, Eth. fil. ; 
Produclus subquadraius ; Productus brachythoeris ; ('honetes, 
sp. ind. ; Deltopecten subquinquehneatus , McCoy ; Modiola, 
sp. ind. ; Myalina (?) Minginewensis, sp. nov. ; and Fene- 
stella or Protoreiepora. On the whole, it seems that the 
aspect of the fossils from Minginew is that of the Permo- 
Carboniferous as developed in Eastern Australia. 
Beneath these beds, according to Mr. Campbell’s 
researches, there occurs about the middle of the Carboni- 
ferous Series a zone of clay and argillaceous limestones 
containing very man}- boulders with smooth surfaces, 
well defined grooves, and cross scratchings, such as ice 
action alone can produce. The boulders consist of granite, 
gneiss, amvgdaloidal lava, sandstone and limestone, identi- 
fiable with the rocks forming the plateau to the eastward 
of the main granite range. 
The most extensive outcrop of this boulder bed is near 
Nangatty Homestead, on the western. side of the Irwin River 
The same bed evidently occurs on the south side of the Irwin 
River, on Location i,go2, where there is a very large quartzite 
