52 
LUDWIG GLAUERT, F.G.S. : 
In the Northern Territory the results of Hardman’s 
discoveries have long been applied to practical use. The 
Cambrian rocks of the Territory, unlike those which have 
been provisionally classed as Ordovician, may be divided 
into two groups — the Southern facies, extending from South 
Australia proper as far as Tennant’s Creek, in the N.T., 
contains mudstones or compact shales which carry a Trilobite 
fauna, including Olenellus and two diminutive genera, 
Agnosius and Microdiscus ; and the Northern and Eastern 
facies, which is essentially a limestone formation pure and 
simple, though interbedded sandstones are found at the 
Fergusson River. 
Mr. H. Y. L. Brown has described a typical outcrop 
in the following terms (l.c., p. 14) : — 
“Outcrops of the rock two miles north of Noltenius Billabong, and 
about nine miles from the Daly River, consist primarily of a compact blue 
grey and yellow subcrystalline limestone, parts of which are rich in pteropod 
tests of Sallerella, weatheiing slightly in relief. The beds are horizontal, 
and the line of outcrops trends north westerly. No deep section is 
available, and wherever encountered the ouLcrops rise but a few feet above 
the surface. The physical features are low, banked, denuded tables 
separated by horizontal joint planes and piled one upon the other, the 
uppermost being veiy much smaller than the iowest visible, which rest upon 
massive beds of the same rock below. The exposed surfaces have been 
eroded in a remarkable manner by the atmosphere, and appear in the 
form of sharp confluent serrated ridges grading downwards on all sides ; 
the whole giving the effect of a model of mountain chains on a small scale. 
The rocks thus decompose comparatively readily and produce a rich red 
clay soil. 
“ The beds overlie unconformably the schistose Pre-Cambrian rocks on 
the East and West. On the West of Mount Shoobridge the beds rise to 
greater altitude, as isolated outliers, and are overlain by more recent 
sandstones. 
“ In lithological characters this formation is similiar to that covering 
large areas between (1) the Katherine Station and Flora Falls, also to that 
at (2) jasper and Timber Creeks, off the Victoria River ; (3) between the 
Elsey and Daly Water Stations on the Transcontinental Telegraph line, and 
(4) Anthony’s Lagoon, (5) Brunette Downs, (6) Alexandria Station, and 
other places. It is most probably continuous beneath the basalt, sandstone 
and other later formations. The occurrence of Cambrian fossils near the 
Daly River and Alexandria Station prove that these widely separated 
expanses of limestone are identical in age.” 
Glancing at the description published in the various 
reports dealing with the geology of the eastern portion 
of Kimberley we find the Ord River district presents numer- 
ous patches of limestone 
Dr. jack (in G.S.W.A. Bulletin 25) maps and describes 
two bands of hard limestone of undetermined age dipping 
at a steep angle ; these he regards to be the summits of an 
ancient range almost entirely submerged by the lava flows 
which now form the well known Argyle Downs. Similar 
bands of limestone are seen in the flank of the Albert Edward 
Range, a considerable distance to the South West, where 
