58 Harris and Crawford : 



Bendigo, Steiglitz, or Castlemaine, and there cannot be the com- 

 plete succession of beds between the D. bifidus beds and the 

 Djerriwarrh Diccllograptus beds. The Uniformity of the junc- 

 tion — a line running nearly north and south for several miles — 

 suggests that we are most likely dealing with a fault. The 

 Djerriwarrh valley appears to follow the fault line for some dis- 

 tance. All that can be said as to the age of the fault is, that it 

 seems to be much older than the tertiary faults of the Werribee 

 District. It is certainly pre-Newer Volcanic, and so old that, 

 though it must have meant a considerable vertical displacement,. 

 the contour of the area is not dominated by it, though its effect 

 on the physiography has been important. The throw is probably 

 small in the north, and increases southwards. The down-throw 

 or eastern block seems to have pivoted on the Macedon platform,, 

 and the break in the continuity of the shales north of Gisborne is- 

 probably small. 



Vlll.-Riddell Grits. 

 (a) General Survey. 



Two miles south-east of Gisborne, a small stream known 

 locally as Watson's Creek, crosses the Mount Alexander Road. 

 On QS. 7 NW. there is the following note on this locality: 

 " Hard gritty sandstone, grey . and pinkish-white, containing 

 minute fragments of fossils, is used for road metal." On some 

 copies of QS. 7 NE. the word " Fossils " appears in white letters, 

 on the coloured background south of Mount Holden, but it is 

 absent from others, probably of another edition. The absence of 

 fossiliferous Ordovician sandstones of Ordovician age in Vic- 

 toria, as far as we were aware, led us to examine the Watson's- 

 Creek outcrop carefully. The resemblance the rock bore to that 

 which occurs at Allot. 11, Kerrie, referred to the Upper Silurian, 

 by Mr. Chapman, 32 was at once apparent, but the chief fossils 

 were only casts of crinoid stems and obscure fragments of 

 brachiopods. Our partial success led us to examine carefully 



32. 17, p. 225. . 



Note. — While this Paper was in course of preparation, fossils were discovered 

 in Lower Ordovician grits or coarse sandstones at Castlemaine by Mr. A. L- 

 Hopkins, at that time a student at the Castlemaine High School. The com- 

 monest fossil has been identified by Mr. Chapman as an Orthis comparable with 

 Orthis jlcihelluliim, Sow. or 0. pectinella, J. Hall. Trilobite remains, pi-obably 

 referable to Agnostus, also occur, while impressions of phyllocarids are common. 

 The writers have discovered indeterminate brachiopod remains near the Cain- 

 paspe River, west of Woodend, and it is probable that Ba 75, QS. 10 NE. refers^ 

 to a similar occurrence. All these outcrops are in the Castlemaine series. 





