216 



greater part of these later rocks, and has thus exposed the 

 older rocks upon which they orginally rested. Boulders 

 derived from these Upper Palseozoic rocks are found in the 

 King River. 



Mount Lyell and the Linda Goldeield. 



Through the kindness of Mr. Jas. Grotty, and Mr. Belstead, 

 Secretary of Mines, I have recently received a very fine collec- 

 tion of rocks from the neighbourhood of Mount Lyell and 

 Mount Owen, which, with "former collections from the same 

 locality, afford valuable information respecting the geology of 

 this interesting auriferous region. Since these were received, 

 Mr. Thureau's report of the Linda Goldfield has been pub- 

 lished, and his observations confirm the accuracy of the des- 

 cription given already by Messrs. T. B. Moore, J. Crotty, and 

 others. 



Prom the various sources of information, wo learn that the 

 major axis forming the West Coast Bange, including the 

 lofty peaks already named, are mainly composed of the 

 following rocks in ascending order : — 



1. Hydro-mica schists and slates, frequently^ 

 of a soft unctuous nature, grandular and J 



laminated in structure, with a prevailing J flipping t0 t j le 

 silvery white or pearly lustre. _ ! "West at an 



2. Indurated laminated hydro - mica schists V angle of f rom 

 frequently with fine tubular markings, and 60 g eo , tQ 80d 

 containing imperfect impressions of marine I 



organisms (Strophomena, Spirf era, Fenestella J 

 etc.), overlying No. 1. / 



3. Indurated bands of granular or crystalline -> _ 



quartz of an igneous appearance, and of a dipping to the 

 pinkish colour on weathered surface, in- 1 South, at an 

 timately associated with bands of a friable Tangle of from 

 decomposed grit also of a pinkish, hue, com- 25deg. to4 0deg. 

 posed mainly of quartz and felspar. J 



4 Coarse breccias and conglomerates, white and pinkish, 

 forming the caps of Mount Owen, Mount Lyell, and other 

 lofty crests, worn, furrowed and often isolated from con- 

 tiguous masses, by long continued denudation. 

 It is evident that JSTos. 3 and 4 are of a much later age than 

 1 and 2, and in all probability more recent than the 

 Brachioped sandstone of the Queen Biver group, which may 

 probably succeed Nos. 1 and 2. 



It is not improbable, therefore, that the capping con- 

 glomerates of Mount Lyell and Mount Owen may be of the 

 same horizon as the Dial Bange and Table Cape con- 

 glomerates, which are known to contain similar fossils. 



The rich auriferous deposit, now famous as "The Iron 

 Blow," occurs on the low ridge connecting Mounts Lyell and 



