Upper Ordovician conodonts from the Bowan Park succession, central new South Wales, Australia

Some 2379 conodont specimens have been recovered from 50 samples through th e 560 m thick Bowan Park Group and the basal part of the Malachi's Hill Bed s of Late Ordovician age, from the western side of the Molong high, in cent ral New South Wales. These have been assigned to 32 species including three new species, Panderodus nodus nov. sp., Paroistodus? nowlani nov. sp. and Yaoxianognathus ani nov. sp., and a revised multielement apparatus of the s pecies, Yaoxianognathus? tunguskaensis (MOSKALENKO). Two stratigraphically distinct conodont assemblages characterised by the first appearances of T. blandus and T. tumidus, respectively, are recognised. They are correlated w ith similar faunas in the mid-upper part of the Cliefden Caves Limestone Gr oup and the lower Malongulli Formation of the eastern Molong High in centra l New South Wales. The Bowan Park fauna as a whole is dominated by Panderod us gracilis (BRANSON & MEHL), Yaoxianognathus ani nov. sp., Belodina conflu ens SWEET, Protopanderodus liripipus KENNEDY, BARNES & UYENO and Drepanoist odus suberectus (BRANSON & MEHL) (72% of total fauna), and shows a mixture of North American Midcontinent and North China affinities. However, influx of some species of North Atlantic Realm aspect mainly occurs in the T. tumi dus assemblage which, exhibiting a significant increase in diversity, is pr eserved in a relatively deeper water facies.