GRAPTOLITES OF AUSTRALIA 
47 
Monoclimacis Frecli), M. sp, (colonus group), M. sp. and (1) 
Monograptus or Cyrtograptus. 
From the Thomson River valley at a blazed tree, 23 chains 
south of the southern boundary of the map. Hall identified 
M. cf. diihius, and M. sp. 
The grajDtolites from the IJp]3er Ordovician have been 
reviewed (53, 56, 102). 
1926. — J. Harris (105) described and figured Didymo- 
graptus nodosus sp. nov., Cardiograptiis crawfordi sp. nov., 
Cry ptogra plus tricornis, Atopograptidae fam. nov., Atopo- 
graptus gen. nov., A. woodivardi sp. nov. He commented on 
an assemblage from a locality north of Gisborne and one at 
Bendigo East, both high in the Lower Ordovician and 
possibly the highest yet recorded. 
1927. — O. A. Jones (107) recognized the presence of Mono- 
graptus chimaera, M. colonus, M. romcri and M. varians at 
Studley Park, Melbourne. He showed that they indicated 
an horizon equivalent to that of the M. nilssoni Zone of the 
Lower Ludlow and were younger than the graptolites 
recorded from South Yarra, Macclesfield and Keilor. 
1928. — R. A. Keblc (108) examined two of the slabs from 
the Ring River, Tasmania, previously examined by T. S. Hall 
(48) and recorded a Dichograptid fragment, (?) Tetra- 
graptus sp., (?) Leptograptus sp., (?) Syndyograptus sp. 
W. J. Harris and R. A. Keble (109) described and figured 
Staurograptus diffissus sp. nov., Dictyonema campanulatum 
sp. nov., and 1). scituhun sp. nov., from a band of blue slate 
at Lancefield. They regarded the Ixid as the oldest graptolite- 
bearing bed yet found in Australia and later (121) placed it 
at the base of the Ordovician. 
E. W. Skcats (110) reviewed the field evidence regarding 
the occurrence of Silurian and Ordovician rocks in the IVal- 
halla-Woods Point District where Etheridge^ had noted 
traces of primitive plants in marine shales. As a result of 
the detailed study of the district by Herman, ^ Whitelaw," 
111111161’,“ and Baragwaiiath,® the Silurian formations had 
been divided into the Lower (Mt. Useful), Middle (Joidan 
1. Etheridge, R., Determinations of Palaeozoic and Mesozoic Fossils, Rec. Geol. Surv. 
HeJmaJ' H., iS^v- on the Walhalla Goldfield. Special Rep. Dep. of Mines, 
3. Whitelaw, O. A. L., The Wood’s Point Goldfield, Menn 3, Geol. Surv. Viet. 
1905, and The Topography, Geology and Mines of the Woods Point District, ibid., 13. 
^^4. Tunner, N. R„ The Geology of the Ore Deposits of the Walhalla- Woods Point 
Auriferous Belt Proc. Aust. Inst. Min. & Met. (n.s.) 39. 1909. ^ , c 
5. Baragwanath, W., The Aberfeldy District, Gippsland, Mem. IS, Geol. Surv. 
Viet. 1925. 
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