20 
found to contain from 12 to 22 per cent, of carbonate of magnesia, 
from 14 to tSO per cent, of carbonate of lime and of carbon dioxide 
from 21 to 47 per cent., in addition to varying proportions of silica. 
The limestones often have a characteristic surface not unlike 
an elephants hide. On account of its definite characteristics, and 
its mode of origin which serve to separate it from the bulk of the 
Nullagine beds, it has been deemed advisable to designate the 
group by a distinctive specific name, h^or this purpose 1 propose 
to ado])t for this lithological and stratigraphical unit, the nani-e. 7"^^^ 
Carawme Dolomite Series, from the name of that locality on the 
Oakover River, where the dolomite is so well developed and where 
the numerous beautiful clift-sections afford splendid opportunities 
for investigation. (Fig. 20). 
tig. 2U. 
Doloniilic Lirnesiune, Carawine Oakover River, Pilbara 
Goldfield. 
The thickness of the limestone in the Carawine Pool* section 
is as measured not less than 400 feet: the base of this bed of 
dolomite is exposed on the eastern side of the Pool, and is seen to 
rest upon a volcanic rock. The limestone contains bands of chert 
and jasper, which have not however, up to the present yielded any 
recognisable fossils, though in all probaliility their origin may be 
ascribed to the accinniilation of siliceous skeletons of sponges or 
diatoms. The limestone as exposed at Carawine covers a very 
wide extent of country, for It has been found to be continuous at 
least 2(t miles to the southward. In certain localities springs of 
water, highly charged with carbonate of lime, issue from the cliffs 
*Lands Department Litho. 108/300. 
