. Bulletin of the Natural Histort Museum. Geology series. 148 MARSICANO AND A. WARREN. Fig. 1 Trucheosaurus major, holotype MMF 12697a. Skull. Scale bar represents 20 mm. Diagnosis. Rhytidosteid amphibian apparently lacking tabular projections and otic notch; markedly small orbits located laterally on the anterior third of the skull table; extremely anteroposteriorly elongated parietal bones, which are nearly three times the length of the frontals and apparently without pineal foramen. Holotype. Skull table (MMF 12697a), the partially complete and articulated postcranial skeleton (AMF 509
. Bulletin of the Natural Histort Museum. Geology series. 148 MARSICANO AND A. WARREN. Fig. 1 Trucheosaurus major, holotype MMF 12697a. Skull. Scale bar represents 20 mm. Diagnosis. Rhytidosteid amphibian apparently lacking tabular projections and otic notch; markedly small orbits located laterally on the anterior third of the skull table; extremely anteroposteriorly elongated parietal bones, which are nearly three times the length of the frontals and apparently without pineal foramen. Holotype. Skull table (MMF 12697a), the partially complete and articulated postcranial skeleton (AMF 50977), and the counterpart of both skull and postcranial skeleton (BMNH R3728). TYPE LOCALITY AND HORIZON. Glen Davis Formation of the Charbon Subgroup, the lower deltaic facies of the Illawarra Coal Measures, Airly, near Capertee in the west of the Sydney Basin (New South Wales, Australia). The whole of the Illawarra Coal Measures are Late Permian (Young & Laurie 1996). The Glen Davis Forma- tion, which is placed mid-way through the Illawarra Coal Measures (McMinn 1985), contains the palynomorph Microreticulatisporites bitriangularis, the index form for the base of the Interval Zone (Burgerem/. 1992), making it middle Dzhulfian correlation for the middle part of the Illawarra Coal Measures was confirmed in the most recent survey of evidence for the placement of the Permo-Triassic boundary in Australia (Foster et al. 1997). Description Skull. As mentioned above, the specimen is only preserved as a thin layer of bone on two slabs (part and counterpart). Although obvi- ously part and counterpart of the same specimen, the two halves do not meet cleanly when fitted together as several millimetres of the bone is missing in places. Determining sutures was difficult as little detail remains, perhaps because the specimen was preserved in a torbanite. The clearest sutures are in the area of the left tabular, postparietal, supratemporal. parietal, postfrontal and
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