. Bulletin of the British Museum (Natural History), Geology. ORDOVICIAN-SILURIAN BOUNDARY IN AUSTRALIA 185. Fig. 2 Correlation chart of Ordovician-Silurian boundary sections in Victoria. For location of columns, see Fig. 1. Graptolite horizons are shown by asterisks. and 95m higher in the same section (VandenBerg et al. 1984: fig. 3), and contains Cli- macograptus normalis, C. angustus, and Glyptograptusl persculptus or a species very close to it. This assemblage is considered to correlate with the British persculptus Zone at Dob's Linn (Williams 1983). The next graptolite zone, the Zone o
. Bulletin of the British Museum (Natural History), Geology. ORDOVICIAN-SILURIAN BOUNDARY IN AUSTRALIA 185. Fig. 2 Correlation chart of Ordovician-Silurian boundary sections in Victoria. For location of columns, see Fig. 1. Graptolite horizons are shown by asterisks. and 95m higher in the same section (VandenBerg et al. 1984: fig. 3), and contains Cli- macograptus normalis, C. angustus, and Glyptograptusl persculptus or a species very close to it. This assemblage is considered to correlate with the British persculptus Zone at Dob's Linn (Williams 1983). The next graptolite zone, the Zone of Parakidograptus acuminatus, is based on a single described specimen of P. acuminatus cf. acuminatus (VandenBerg et al. 1984) which came from the core of an anticline north of Darraweit Guim, low in the Deep Creek Siltstone, but unfortunately structurally isolated from the more complete sections west of Darraweit Guim. Its precise stratigraphical relationship with the persculptus Zone is therefore not known. The same applies to an assemblage from PL665, low in the Deep Creek Siltstone NW of Darraweit Guim, consisting entirely of Glyptograptusl venustus (Legrand nan Mu) (figured as C. normalis in VandenBerg et al. 1984: fig. 10A). Little work has been done on the sparse graptolite fauna higher in the Deep Creek Siltstone (Harris & Thomas 1937, 1949), and much of it is in need of revision. Sufficient material has been collected, however, to indicate that the graptolite record is far from complete and can only be correlated with reference to the standard British sequence. Mount Easton In the Mount Easton Province, farther east in the Melborne Trough (Fig. 1), VandenBerg (in Webby et al. 1981) has recognized a nearly complete Upper Ordovician sequence of graptolite faunas in the Mount Easton Shale (Fig. 2). Faunas range from the Darriwilian Zone of Pseudo- climacograptusl decoratus to the Bolindian Zone of Dicellograptus ornatus and Climacograptus latus. VandenBerg (1975)
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