Devonian sharks from Antarctica 
291 
antiarch and crossopterygian material from the 
upper fish horizons in this section (units 54 and 62, 
187-212 m above base) were described by Ritchie 
(1975), Young (1988) and Young et al. (1992) 
respectively. Askin et al. (1971) also recorded fish 
remains in the A4 section from lower units 37 and 
44 (137 m and 158 m above the underlying Beacon 
Heights Orthoquartzite), which were not collected 
in 1970/71. New material from this section 
collected in 1991/92 comes from a newly 
discovered site about 120 m above the base in a 
coarse pink-buff quartzose sandstone, labelled in 
the field as horizon "M". 
Portal Mountain 
Site 11 (Young 1988) 
Portal Mountain, 68/69 locality. Fish remains 
were discovered here on the southern face near the 
end of the eastern ridge from the summit of Portal 
Mountain by VUWAE 13 in 1968-69. The small 
collection, including shark teeth, was briefly 
described by Ritchie (in McKelvey et al. 1972). This 
is section 10 of Barrett and Webb (1973), and the 
original teeth of Portalodus bradsliawae gen. et sp. 
nov. came from unit 17, about 40 m above the 
lowest exposure of the Aztec Siltstone (base 
obscured by ice). A fin-spine recorded from here 
was provisionally referred to Antarctilamna prisca, 
as was another from a higher horizon in the same 
section (unit 26, 70.8 m above lowest exposure), 
where more 'xenacanth' (Portalodus bradshawae gen. 
et sp. nov.) teeth were found (Young 1982). 
Site 12 (Young 1988) 
Portal Mountain, 70/71 locality. The adjacent 
section PI of Askin et al. (1971) was measured up 
the eastern face of this outcrop, and shark scales 
and teeth were referred to Antarctilamna prisca by 
Young (1982). 
Portal Mountain, 91/92 locality 
New material was collected from the eastern face 
about 200 m west of locality 11. The specimens 
came from about 70 m from the base of the Aztec 
Siltstone in a red mudstone which has lenses of 
fish bones and scales. 
Lashly Range 
Site 8 (Young 1988) 
Mount Crean. The original in situ material from 
this locality (Gunn and Warren 1962) was 
described by White (1968). Section L2 of Askin et 
al. (1971; also McPherson 1978) was measured here, 
and stratigraphic levels for seven collecting sites at 
this locality (MC 1-7) were discussed by Young 
(1988:12,13). 
Site 9 (Young 1988) 
Lashly Mountains, southeast of Mount Crean. 
The type locality and horizon for the holotype of 
Antarctilamna prisca Young, 1982, is from about 15 
m above the base of the Aztec Siltstone, probably 
units 8-10 in section LI of Askin et al. (1971). 
blew locality, third outcrop of Aztec Silstone southeast 
of locality 8 
This is the type locality for Aztecodus harmsenae 
gen. et sp. nov. This section (field name "LA") is 
the second exposure of sediment south of the main 
L2 section (locality 8, text-figure 4 of Young 1988). 
Two horizons yielding fish remains were located 
during 1991/92. The lowest horizon (field name 
LA-1) occurs about 38 m from the base and is a 
medium-grained clean quartzo-feldspathic 
sandstone containing Bothriolepis cf. askinae, 
Portalodus bradshawae gen. et sp. nov., a low- 
crested, finely tuberculated species of 
Groenlandaspis, with the notable absence of 
thelodont scales. The holotype tooth of Aztecodus 
harmsenae gen. et sp. nov., along with several other 
specimens came from a slightly higher horizon 
about 68-70 m from the base of the Aztec Siltstone. 
The lithology exposed here is a buff-coloured pink 
medium-coarse quartzose sandstone with 
interspersed green silts. Fish remains occur as 
scattered debris consisting largely of isolated, and 
commonly fragmented placoderm plates 
(Bothriolepis sp.), acanthodian spines and scales, 
and shark teeth. In addition Portalodus bradslmwae 
gen. et sp. nov. also occurs in this horizon, 
although teeth of Aztecodus gen. nov. are more 
abundant. 
Mount Feather 
10. Gunn and Warren locality (57/58) 
This locality has not been recollected. The 
original material obtained by B.M. Gunn and G. 
Warren included a single shark tooth described by 
White (1968) as the holotype of Mcmurdodus 
featherensis. Its horizon within the Aztec Siltstone is 
unknown. 
SYSTEMATIC PALAEONTOLOGY 
Class Chondrichthyes Huxley, 1880 
Subclass Elasmobranchii Bonaparte, 1838 
Antarctilamna Young, 1982 
Antarctilamna cf. prisca Young, 1982 
Figures 3, 4,13 
Material 
Seven isolated teeth, mostly complete: WAM 
90.2.37, 92.2.2 - 92.2.6, 92.3.68. 
