56 
LUDWIG GLAUERT, F.G-S. : 
Shales, sandstones, grits, etc., of Ordovician (?) Age, 
previously classed as Carboniferous, Fossili- 
ferous Limestones of Cambrian Age, previ- 
ously classed as Carboniferous, Indurated 
Sediments referred to as Pre-Cambrian 
previously classed as Devonian, 
and an altered and metamorphosed series, the gold-bearing 
beds of the District, which are much older than the pre- 
ceding and are termed Archaean to distinguish them from 
the later Pre-Cambrian rocks. 
These conclusions are confirmed by palaeontological 
evidence of fossils found and by the careful and thorough 
work done by Mr. H. Y. L. Brown in the Northern Territory, 
which enables us to trace several exposures across the 
border. 
Whilst admitting the difficulty of undertaking work 
of this kind from an arm chair, I feel thoroughly convinced 
that the foregoing conclusions are correct. 
