20 Transactions. 
rocks, which Andrews (1913) considers to be pre-Silurian. These are 
followed eastwards by a widespread series of graptolitic slates and (rarely) 
radiolarian cherts, which, however, belong entirely to the Upper Ordovician. 
In the north-eastern corner and extending thence into Queensland are the 
very altered phyllitic rocks known as the Brisbane schists, and these, 
together with some slaty rocks near Rockhampton, contain phosphatic 
minerals which, in the absence of better evidence, has caused them to 
be grouped with the Ordovician rocks of Victoria (Dunstan, 1916). The 
graptolitic Lower Ordovician rocks in Victoria were divided by Hall 
(1899, 1914) into four major groups, termed, in ascending order, the Lance- 
fieldian, Bendigonian, Castlemainian, and Darriwillian beds respectively. 
Harris (1916) and Keble (1920) have divided parts of this succession into 
numerous subzones, the latter finding these to be of considerable economic 
| mu: ul | | xg : БАГ c 
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er Re T., 
Sve Ө зл @ оь 
| TERT 
«a 
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Cine е ММ” Е 
ggg | UPPermést Ordovician Sea >: И... af M 
р (Macdonell Range Series) PEE DUM к: е ii | 7. 
ca ш Sea ond >>, Vea cll 2 
| 8 Lower exposures of sediment [| | ill Е ; с: 
significance in the study of the Bendi ; oe of 
he hac „шау endigo region. Characteristic genera 
beds, wherein the second two are subordinate, but the first pair also ascend 
as high in the series as the Castlemaini eras d : 
than the highest to which they EM non is on олие habs 
ascend in Europe and America, where 
ovician formation. The Upper Ordovician 
faunal succession has not yet been so closely studied and subdivided, but 
А ; e ‘ E . E 5 
occur with andesitie (or spilitic) la КИ неш оосайо ну 
va-flows. The chief fossils 
