21 
FLANGES OF AUSTRALITES (TEKTITES) 
3. Cross section of boat-shaped australite with well-marked rim. Internal 
flow lines near anterior surface truncated in flow troughs at right 
hand end. 
4. Tangential section of button-shaped australite ; ferruginous clay (black) 
fills the gap a. A bubble crater on anterior surface has a central 
pyramid of glass. Neck of flange vertical. 
5. Longitudinal section of oval australite. Flow lines parallel to posterior 
surface. Remnants of former flange (top right). Flow lines trending 
from both posterior and anterior surface regions into a new flange. 
Irregular bubble cavity on anterior surface. 
6. Radial section of lens-shaped australite showing directions of major 
flow lines trending from anterior to posterior surfaces. Rim poorly 
developed. 
7. Radial section of lens-shaped australite with bubble crater on anterior 
surface; jagged outline of posterior surface due to numerous bubble- 
pits. Flow pattern complex but flow lines in equatorial regions trend 
towards rim. 
8. Cross section of oval, plate-like australite showing spiral flow lines 
in flange. Flange and core separated by well-marked line of union c 
from which bubbles are nearly absent. Complex flow pattern in core. 
Truncation of flow lines in left hand portion of flange probably due 
to ablation. 
9. Longitudinal section of boat-shaped australite showing flow lines 
partially parallel to its length. Rim pronounced at left hand end; 
abrupt termination of structures at other side probably due to loss 
by ablation. 
10. Cross section of oval, plate-like australite with spirally coiled flow lines 
in flange. Small bubbles (dark areas) along the line of union c. 
11. Longitudinal section of canoe-shaped australite showing flange-like 
ends curving away from anterior surface, and flow lines trending from 
the body into this structure. 
12. Cross section of button-shaped or oval australite showing segmented 
bubble cavity. A crack passes from posterior almost to anterior surface. 
Internal flow lines truncated in flow waves on anterior surface. In 
flange, flow lines in posterior surface regions are contorted in concertina 
fashion. 
Plate II 
Radial sections of flanges. 
Fig. 1. Line of union c sharply defined. Colour bands (darker areas in the 
chin region) parallel with the flow lines. Seat wanting. 
2. Line of union c short, seat separated from base of flange. Flow lines 
in anterior surface regions of core continuous with those in seat. Flow 
groove in outer edge of flange. 
3. Line of union c well marked; flow troughs well defined on anterior 
surface of flange; seat continued well up the flange. Concertina-like 
flow lines in chin regions of flange. 
4. Flow lines near outer edge of flange coiled into a plane spiral, those 
in chin regions normal to outer surface. Accumulations of bubbles 
at line of union c shown by dark areas on core side. Flow lines of seat 
truncated in flow trough. 
