54 
LUDWIG GLAUERT, F.G.S. I 
Hardman reports that on the north bank of the Ord 
and Elvire the limestones are seen to pass conformably 
under other sediments which he describes as being “ micace- 
ous red shales and mudstones with a few bands of limestone 
and larger masses of white, red and grey flags and grits, 
in no section was any unconformity observed. 
These beds are of fair extent in the Elvire and Ord 
River valleys and from information which I have obtained 
from a reliable observer, differ in no wise from beds which 
extend from the Albert Edward Range and Mt. Timperlev 
to the South-East and South-West for some considerable 
distance. They present the same physical features and 
like them are almost, if not quite, horizontally bedded. 
The age of these beds cannot as yet be determined by 
their fossil contents, for up to the present no signs of animal 
or vegetable life have been discovered in them. I urning to 
Mr. Brown's invaluable report of work done in 1905, we 
find that similar rocks arc exposed over the border. An 
area of rocks, bounded on the North by the sandstone Mc- 
Adarn Ranges and on the S.E. by the Sea Range, presenting 
these characters has been mapped by Mr. Brown as being 
most probably of Ordovician Age. They have so far yielded 
no signs of ancient life, but their lithological character so 
closely resembles that of undoubted Ordovician beds of the 
McDonnell Ranges that this great authority, who knew his 
South Australia so well, provisionally assigned them to the 
same geological period. 
Mr. Brown’s map of 1906 shows that these rocks extend 
to the Western Australian border, where, of course, his 
work terminated. Placing his map at the side of that 
prepared by l)r. Jack, for G.S.W.A. Bulletin 25, we find 
that this same series extends westwards towards the C am- 
bridge Gulf, where the rocks rise to form the well-known 
House Roof Hill and the Bastion Ranges. 
Crossing the Gulf, they are shown by Mr. Maitland’s 
sketch map oi 1907 to fringe the coast as far as 127 E. and 
140° S. past w hich point they do not appear to have been 
traced. 
In a southerly direction they make their appearance 
at Mount Elder, south of the Negri River, and on the north- 
ern side of the Ord, extending from Glass Hill to the western 
end of the Dixon Range, both these patches lie conformably 
upon the limestones, which gradually pass into them. 
Opposite the southern end of the Albert Edward Range 
they are found to rest uncoil form ably against the older 
rocks of the range and to occupy the whole of the large 
basin or trough-like hollow which extends away to the 
south. It is therefore not surprising that no Cambrian 
