24 : 
Keith l\. Miles. 
indicates that, unlike th(‘ Camel Humi)'s type^ shearing stress was largely 
inelTective (luring rec-rystallisation and when at all ap[)reciable occurred only 
in the closing stages. The miueralogical compositions point to closely similar 
chemical compositions J'or th(‘ Camel Humps and Mt, Leonora rocks. 
Two other interesting varieties of meta-sedinumts fi'om Mt. Kcmneth in 
the Valgoo Coldtield, and from Quinn’s in the Murchison Goldfield are kyanite- 
bearing (luarlz-cliloi'lte schists and andalusile-bearhig (|uart/-chiorite schists 
respectively, the lattm’ containing incipient kyanite. Comparisons of tin* 
chemical analyses of these with the Mt. la‘onora rock indicate that the two 
formej* (consisted oi'iginaily of \{‘ry similai- sedinumtary mat(U'ial — argilhu-eous 
sands or line grits— and that whih* this may hav(‘ differed in minor details 
from the original Mt. Leonora (and Camel Humps) sediments, all these rocks 
Avere of ess(mtially similar chemical composition. The existing miueralogical 
differences have been i)rodu('ed ]Aartly by slight chemical variations in the 
original sediments, and partly as the result of differences in thf‘ type ami 
degree of metamoi'phisrn which they have suffered. 
Tile (liscovtM’v of a kyanite rock associated with the (Jidcu* Greenstone 
Series in the Mt. Margaixf Goldfield is of (-onsiderable interest in that it 
provides e\'idence of the existem-e in this district of an hitherto unsuspected 
high grade of I'egioual metamoriiliism comi>arable with that found in such 
plact's as tlu' (dHtt(*ring Valley and the '^'ilgarn Goldihdd. 
ACKNtnVLKDGMENTS. 
The writ(‘r gratcd'ully acknowledges his indebtedness to Dr. 1C T. Crider 
of the Depai'tmenl of Geology, Ciiivci'sity of Western Australia, for the 
inspiration of his (mthusiasti(' inter(‘sl and in\’aluablc jiractical assistance', 
and for adA'ice in distnissions and I'evision of the text of this jiaper. In 
additiem he wishes to thank Profe'ssor E. de (C Clarke, Avho made available 
hand-sp(‘cim(*ns and sections from th<‘ I 'uiv(‘i'sity G(‘m'ral (\)lh*ctiou, and Mr. 
H. J. Smith for *])ra('tical help Avilh tiu' pliotogvaphs. Einally, acknowledg- 
ments are also due to tlu' Govcu'iinumt Geologist for permission to mak(' us(' 
of s])ecim(ms and thin slict's from tlic Geological Sur\'(‘y collections, and to 
publisii this papei' and the acemnipanying maj), and also for leave to reprodin-e 
a photograph (Fig. Ik) fi‘om the exc-ellent Survey collection. 
G(‘ological Snrv(‘y of Western Australia, 
I^erth. 
HEFEKENC^ES. 
( 1 ) Tilley, C. E.; ‘^Tlie Eole of Kyanite in the TTornfels Zone of the Cam 
('liuhiiieiig (iraiiite, Koss-sliire. ^ ’ Min. Maff. 1935, 24, p. 92. 
(2) “ Metaiii()i‘]ihic Zones hi tlie Sonthei-n Highlands of Scotland.'^ Qtiart. 
Journ. OroK Soc. 1925, 81. i»)j. 100 - 1 ( 1 . 
(3) Harrow, G. ; ‘‘The Geology of Lower Deeside and the Southern Highland 
Border.' ’ PrOr. Gcol. A.s‘soc. London. 1912, 23, pp. 274-90. 
(4) Harker, A.; “ Metainorphistn. ’ ' London. 1932. 
(5) Simpson, E. S.: “Contributions to the ^liueralogy of W.A. Ser. 1 (4).^' 
Jour. Loll. Soc. W. AuM. 1925-6, 12, pp. 62-6. 
((i) ‘‘The Oecurreni'e ()f Andalnsite, Kyanite, Sillinianite and Staiirolite 
in the Cliittering \'allev.'’ Jour. Pay. Soc. II'. Anst. 1931-2, 18, 
p. 75. 
(7) ‘ ‘ Kew Mineral Records — Kyanite, Middle Cliittering Valley." Ann. 
Pept. Chew. Branch Dept. Mines JV.A. Perth. 'l934, p. 78. 
(S') “ Coiitril)iitions to the Mineralogy of ^^\A. Ser. 9." Jovrn. Poy. Soc. 
7V. Au.st. 1935-6, 22, ])p. 10-13. 
