•.nade up of rounded ellipsoidal, or sul)-ang'ular fragments of the 
underlying beds, d'he conglomerate often in.cliides boulders which 
reach lengths of 1 to '» feet, though the bands containing the large 
fragments are merely local. Figure shows a portion of this 
Fi{?. T2. 
Auriferous Conglomeu-te, Grant’s Hill, Nullagine. Pilbara GoIdBePb 
conglomerate at the entrance to one of the mine workings, reef 
quartz identical in character with that forming the auriferous 
dct)osits in the underlying strata. Ifcing a very common constituent. 
The ])el)l)les arc imltcddcd in a matrix, which is princi])allv sandv. 
though sometimes aluininotis. Idmonitized pyrites up to two inches 
in length, often forms an important constituent of the conglomerate 
or consolidated shingle; owing to the climatic conditions these 
pseudomorphs offer very great resistance to atmospheric influences 
and retaining the exact form of the original ])yritos, crystals accu- 
mulate in fairly large (juantities on the surface. 
The flats in the neiglihourhood of Nullagine arc covered with 
a heterogeneous collection of boulders and blocks, derived from 
the disintegration of the basal conglomerate, of which a good view 
may be seen in Fig. V>\. 
Considerable interest attaches to the nature of ])ortions of the 
basal conglomerate as exposed in the vicinity of Kadgehut Spring, 
a watering place some miles to the south of Nullagine township, 
where the conglomerate is seen to contain some llattened and 
striated ]jel)bles of rocks identical with those forming the under- 
lying strata. 1’he special interest attaching to these striated pebbles 
lies in the fact that a glacial origin had been assigned to them by my 
