178 
C'LARKE AND \ViLLiA?»is. — G('<)h)(jii <)f IJarUiig Iictnge. 
Talbot, II. ir. B. H)!;"), Molylxlonite at Swan Vie^v: Ann. Prog-. 
Geol. Sui'v. W.A. for 1914. 
WoodicaycL IT P. 1916, Tlio building stones of Western Australia: 
Aim. I'rog. liep. Geol. Surv. W.A. for 1916. 
ll'ool nough, IT. (T 1918, The pJiysiograpliie signifieanee of laterite 
ill Western Australia: (reel. Mag. new ser. p. ;185. 
i\d)oliiongh, il'TT 1919, TJie Darling Peneplain of Western Aus- 
tralia: Jourii. & Proe. Boy. Soc. N.S.W. Vol. LII, p. 383. 
H'ool Hough , IT. (t. 1920, The physiograjihie elements of the Swan 
Coastal Plain: Journ, & Proe. Boy. Soc. W.A. Vol. V, pj). 
13-20. 
Explanation op PLxVTES. 
XXI — Looking west down Helena Valley from sjiur on left bank 
of (h)lum Brook. Shows eharaeteristie topography and vege- 
tation. 
XXII — i’hotograph of a model of the Darlington Area of whirli 
Jiorizontal seale is 10 chains to 1 inch, vertical 200 feet to 
1 inch. 
XXI n — Geological map of the Darlington Area. 
XXIA' — Geological map of the Koleystone Area. 
Printed for the Royal, Society of Western Australia by R. S. 
Sampson, 971-973 Hay Street, Perth. 
