20 
FLANGES OF AUSTRALITES (TEKTITES) 
Spiral flow ridges were probably caused by combined rotary 
and translator^ motions; these involve complications far beyond 
the scope of this article. 
Acknowledgments 
My thanks are due to D. J. Mahony, Director of the National 
Museum, for helpful criticism of the manuscript and to J. Spencer 
Mann, Geology Department, Melbourne University, for taking 
the excellent photographs used in the Plates. 
Keferences 
Baker, G., 1937. Tektites from the Sherbrook River District, East of Port 
Campbell. Pr. R. Soc. Viet., 49 (n.s.), pt. 2, pp. 165-77, 2 figs. 
1940a. An Unusual Australite Form. Ibid., 52 (n.s.), pt. 2, pp. 312-14, 1 fig. 
1940b. Some Australite Structures and their Origin. Min. Mag., 25, pp. 
487-94, 1 fig., 1 pi. 
Baber, G., and H. C. Forster, 1943. The Specific Gravity Relationships of 
Australites. Amer. Journ. Science, 241, pp. 377-406, 9 figs. 
Barnes, V. E., 1940. North American Tektites. University of Texas Publication 
No. 3945, pp. 477-656, 17 figs., 5 pi. 
Dunn, E. J., 1912a. Pebbles. Robertson & Co., Melbourne, pp. 30, 34, 45, 63 
and 64, pi. 57 and 58. 
1912b. Australites. Bull. Geol. Surv. Viet., 27, pp. 21, 17 pi. 
1916. Additional Notes on Australites. Pr. R. Soc. Viet., 28 (n.s.), pt. 2, 
pp. 223-27, 1 pi. 
Durand, F. W., 1935. Aerodynamic Theory, vol. 3. Julius Springer, Berlin, 
pp. 212-243, figs. 26-31. 
Fenner, C., 1934. Australites, Part 1. Classification of the W. H. C. Shaw 
Collection. Tr. R. Soc. S. Aust., 58, pp. 62-79, 4 figs., 6 pi. 
1935. Australites, Part 2. Numbers, Forms, Distribution and Origin. Ibid., 
59, pp. 125-140, 3 figs. 
1938. Australites, Part 3. A Contribution to the Problem of the Origin 
of Tektites. Ibid., 62, pt. 2, pp. 192-216, 3 figs., 2 pi. 
Smith, T. Hodge, 1939. Australian Meteorites. Mem. Aust. Museum, Sydney, 
7, pp. 65-70, pi. 19. 
Walcott, R. H., 1898. The Occurrence of so-called Obsidian Bombs in Australia. 
Pr. R. Soc. Viet., 11 (n.s.), pt. 1, pp. 23-53, 2 pi. 
Explanation op Plates 
Plate I 
Fig. 1. Radial section of button-shaped australite showing turbulent flow 
patterns in the core and variations in pattern in the two portions of 
the flange. Flow lines from anterior surface of core pass upwards into 
flange. 
2. Radial section of button-shaped australite. The dark irregular bands 
are cracks infilled by ferruginous clay containing quartz grains. 
