272 
of a purple colour, and is frequently ripvle-marked. ‚ Occa- 
sionally quartzites are developed, but they do not attain any 
considerable thickness. 
The limestone, corresponding to that worked at Brighton 
and the Field River, is greatly disturbed and faulted in this 
district. In composition and structure it is identical with 
the outerops further north, but the severe mechanical strain 
it has been subjected to is shown by the limestone being often 
ramified in all directions with veins of calcite and other 
minerals, which have filled and healed the rents produced 
by the crushing of the stone. 
About three-quarters of a mile south from Hackham the 
limestone is seen on the east side of the road, in Section 40, 
forming a round hill, which has been extensively quarried. 
The stone exposed in the quarry is abou* thirty feet in 
height and is a dark blue limestone, thickly studded with cal- 
cite, which is frequently mixed with fluorite and pyrite. It 
is extensively used for road metal, but the readiness with 
which the calcite breaks down on the rhombohedral cleavage 
makes it less serviceable for this purpose than the more uni- 
form stone of Field River. On the rise of the hill, above 
the quarry, the stone passes up into pink-coloured limestone 
and yellow dolomitic varieties, characteristic of these beds in 
other localities. 'The dip is east-south-east, at a low angle, 
the quarry being situated near the axis of an anticlinal fold, 
the western limb of which has been denuded. In a small 
creek on the south side of the hill an old quar:y, worked on 
the same line of stone, gives an exposure of both limbs of 
the anticline. Тһе limestone has an outcrop of only about 
half a mile in length, being cut off at both ex»remities by 
faults; a strike fault (A) runs nearly parallel with the lime- 
stone, on its eastern side, and cuts it off just north of the 
Hackham quarry, and a dip fault (B) cuts it off near the dis- 
trict road on the south. 
The limestone and associated beds have a south-west 
trend, skirting the agricultural ground which occupies the 
bottom of the valley. From the main quarry they can be 
traced across the first creek, in which the anticlinal fold, 
referred to above, is seen; they then follow the hase of the 
next rise and are well exposed in the next creek (Section 39), 
as strong beds of blue limestone, forming a small waterfall. 
Dip, east-south-east, at 34°. From this point, and through 
Section 47, the outcrop has to be followed chiefly by a thick 
erust of travertine, which ends on the district road running 
north and south, at a point about 200 yards ssuth of the 
main road. Неге the limestone beds are cut off to the south 
by the dip fault, already referred to, and purple slates 
