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J.A. Long, G.C. Young 
Table 1 Vertebrate faunal list for the Aztec Siltstone, 
Antarctica. 
AGNATHA Turinia antarctica Turner and Young , 
1992 
PLACODERMI 
Antiarchi 
Arthrodira 
Phyllolepida 
Incertae sedis 
Bothriolepis antarctica Woodward, 
1921 
B. alexi Young, 1988 
B. askinae Young, 1988 
B. barretti Young, 1988 
B. karawaka Young, 1988 
B. kohni Young, 1988 
B. macphersoni Young, 1988 
B. mawsoni Young, 1988 
B. portalensis Young, 1988 
B. vuivae Young, 1988 
B. sp. indet 1-13. 
Pambulaspis antarctica Young, 1989 
Antarctolepis gunni White, 1968 
Groenlandaspis antarcticus Ritchie, 
1975 
Groenlandaspis spp. 
Boomeraspis goujeli Long, 1995a 
phlyctaeniids spp. 
lAustrophyllolepis sp. 
phyllolepid indet. 
Antarctaspis mcmurdoensis White, 1968 
CHONDRICHTHYES 
Mcmurdodus featherensis White, 1968 
Antarctilamna prisca Young, 1982 
Anareodus statei gen. et sp. nov. 
Aztecodus harmsenae gen. et sp. nov. 
Porlalodus bradshawae gen. et sp. nov. 
ACANTHODII Gyracanthides warreni White, 1968 
Antarctonchus glacialis White, 1968 
Byssacanthoides debenhami 
Woodward, 1921 
Culmacanthus antarctica Young, 1989 
Cheiracanthoides sp. (scales). 
Ischnacanthid gen. indet. 
OSTEICHTHYES 
Actinopterygii palaeoniscoid gen. nov. 
?palaeoniscoid indet. 
Rhipidistia Gyroptychius ? antarcticus 
(Woodward) 
Koharalepis jarviki Young et al., 1992 
Mahalalepis resima Young et al, 1992 
Platyethmoidea antarctica Young et al., 
1992 
Vorobjevaia dolonodon Young et al., 
1992 
Notorhizodon mackelveyi Young et al, 
1992 
porolepiform indet. 
Dipnoi ? Eodenodus sp. 
Howidipterus sp. 
?ctendontid indet. 
Antarctilamna prisca. Specimens are lodged in the 
Western Australian Museum, Perth (prefix WAM), 
the Australian Museum, Sydney (prefix AMF), and 
the Commonwealth Palaeontological Collection, 
Australian Geological Survey Organisation, 
Canberra (prefix CPC). 
LOCALITY INFORMATION 
Full details of all fossil fish localities known to 
that time from the Aztec Siltstone were provided 
by Young (1988). Information is given below for 
new localities and previous localities yielding 
described shark material. Numbers refer to 
localities 1-24 of Young (1988, figure 3). The 
regions are dealt with here from south to north. 
Cook Mountains 
Several new sites were discovered in the Cook 
Mountains during the 1991/92 field season (Figure 
1, left). Shark teeth were recovered from "Gorgon's 
Head" near Mt Hughes, the same area from where 
fish were first recorded during the 1988/89 season 
(Woolfe et al. 1990). Other material came from the 
Fault Bluff sections and at Mt Gudmundson. 
Stratigraphic sections of the Aztec Siltstone and 
Beacon Heights Orthoquartzite from these 
localities were measured by M. Bradshaw and F. 
Harmsen and are currently being compiled. Figure 
2 shows the provisional stratigraphic position of 
the fish faunas from the Cook Mountains referred 
to in the text, based on field measurement of 
stratigraphic sections. 
Fault Bluff, "fish hotel" section 
This stratigraphic section was measured along a 
low ridge running north-south outcropping 
immediately north of Fault Bluff (79°18'S, 157° 
41'E). The stratigraphic sections were logged by M. 
Bradshaw and F. Harmsen. A continuous outcrop 
of Aztec Siltstone approximately 91 m thick is 
exposed here, although the base of the section is 
covered by scree. By comparison with the 
surrounding outcrops, the top of the Beacon 
Heights Orthoquartzite would sit within 20 m of 
the base of the section. Several fossil fish bearing 
horizons were located: site "A", about 45 m above 
the base, contained isolated impressions of fish 
plates in hard white orthoquartzite; site "B", about 
67 m above the base, has rich accumulations of 
well-preserved fish remains in a medium-coarse to 
gritty quartzose sandstone; site "M", about 72 m 
above the base, is a fine, green siltstone with small 
fragments of well-sorted fish bone and scale debris; 
site "Y" about 85 m above the base, has occasional 
fish plates in quartz sandstone; and site "Z", at the 
top of the exposure about 88-90 m above the base, 
is a clean, indurated orthoquartzite rich in fish and 
plant remains. Lycopod stem axes are here 
