216 
]\I AlTLAXD. — il'rslcni it.sf ra/ Id ii (Innugij. 
i' i/iTS(Mit,'iri\cs {)t‘ i-;icli ocelli' in in-orly ovory volt. Tlie basic I’ocks 
- ‘ ‘ o'l oriisl c.HOs ’ - proliab.ly ori „-i i\,]| v iic-li‘rir''s - arc of variable 
litbolo^'ical IvjM's ao-l iu c'»ii'nh>n with the other memliers of th;' 
Pi'-'-t aiiibi iaii foimations liaw' iiii'h'rfvoiu' exUaisive and widespreau 
iiietanioT])liism, proiliiciu^>; on the oik' hand rocks of tiu' e])idiorite 
1yi>e, and on the otlier the carbonated ,L,'re(’iistoiie type. Idtrad)asic 
rocks are i-epresc .uted bv aerpcoitiae, talc-sidiist, etc. An extensive 
d<‘V(d<i]nii('ni of tin* ra.re tyi>e of liypcrsthene-iieariiie' rocks, with 
a marked persistent mineral liandin^' siiiiilai' in (diaraidei* and mode 
(.!’ occurrenci' to those of tin* (diainockite Series of West Africa, 
India, Norway and p.irts of the North American Chnitinent, has 
b(‘eii recoj^'iiised in tlu' Frasi'v’s 1‘an^e, to tli(‘ north of Israelite 
liay. 
T||,. Pred’amindan rocks have been invaded iiv liirye composite 
batlufbths ami veins of e;iani+(' wdiiidi exdend over some hundreds 
(d' s'jiiarc' mil's. They freoneiitlv have a schistositv develojiel. 
abnio' tiadi' lines of e(aitaet with, tins rocks into which they intrude. 
The acid badholilhs and their satidlitic intrusions aro larg'oly blotitc'- 
e'ranile‘', nsiialb' nanh' uo of vjdoaudine. oUroidasc and (piartz, witli 
a markf'd miia'ral bandino' or ;j;'noissic structure well develojied. 
These extensive granite masses arc travio-sed bv many g-reat dyk«''- 
liKe masses of whit'' (piartz which represent tin' end nltrn-a d 1 
piaclmd of the diffc'ri'iitiation of the granitic ma^yanas. The in- 
trusion of the c'raiiite ami its allies is iierhaps the most imjiortaid 
( vent iu the c‘eoloc’jca: history of the State at this early ])eriod, 
inasmuch as wdth them are associated, areally and ,^■mletically, the 
most imviortant ic'old and other metal-heaviiiiLi' de])osits whiidi place 
Western Australia in tlu- front rank of mining countries in the 
Itritish Empire. 
\'i'wve 1 bn -dn dyht of i'^'s ‘••S’nctural n'eoloc'v, coujded 'wivU 
the nature, ■'.an-iety, and wddn distribution of its mineral deiiosits, 
Western Australia apjH'ars to Ix' one of the most lA'inarkalde mineral 
ren’ious on tlie Australian continent. According To researches which 
have been cai'ried out, it ati])ea.rs that 2d..d mineral species have 
Im'v'ii alrea'iy met with in the State. Of tin' raier minerals, -wliicli 
occur as accessory constituenls iu the a]) 0 !)liyses of the granites, 
and haw' a wide distribution iu tlie State, tliirty-six are contined 
tf' Western Australia and liav'- so far not bec'U recorded from other 
]iarts of the Oommon wealth. \\'liilst Dr. Simpsmi, l>y wdiose re- 
:-'':mhes our kiio-wledge of tl;e nrineralogy of the State has been 
so much advanced, notes that the three mirn'rals hitherto unknown 
to science, discovered by him, viz: Pilbarite (one of the uranium 
minerals), Goongarite (an argentiferous sulphide of lead and bis- 
muth), and Tantalofergusonite (a rare mineral of the yttrium group) 
have not yet been met udtli anywhere else. The taiitalate and 
