82 
Rex T. Prideb. 
mouncL The ferric sulphate minerals crystallising throughout the j^orous 
diatomite would probably supply sufficient force to cause the slow uplift of 
the mound that has been observed. 
ACKNOWLEDGMENTS. 
I wish to acknowledge my thanks to Mr. L. Burgess for drawing my 
attention to this deposit. The expenses entailed by a visit to the locality 
were met by a Commonwealth Research grant for work on the Pre-Cambrian 
rocks of W.A. My thanks are due also to Professor E. de C. Clarke for his 
assistance in connection with the visit to the locality and during the pre- 
paration of this paper. 
REFERENCES. 
Berry. L. G., 1939. “ Composition and Optics of Copiapite ” (abstract). Amer. 
Vol. 24, p. 182. 
Larsen, E. S. and Berman, H., 1934. “ The Microscopic Determination of the Non-opaque 
Minerals, 2nd Ed.” U.S.G.S. Bull. 848. 
