Geology of the Barivon about Inverieigh. 297 



Bruce's Creek Junction. 



A good section is displayed on the river bank in Section IV. A, 

 Murgheboluc. The composition of the beds, as before, is grey, 

 sandy clays, and a fair number of fossils were obtained, including 

 a tooth of Cestracion, n.sp., and, as is usual in sandy beds, the 

 fossils have disappeared from the higher parts of the cliffs. 



From here to PoUocksford, a little over two and a half miles in 

 a straight line, the river gorge is narrow, and its sides are masked 

 by basalt from the plateau above. Here and there indications of 

 the underlying tertiaries are to be seen in places ; but, even 

 where sandy cliffs occur under the basalt, as in Section IV. C, 

 which is inaccessible, or in Section V. B, no fossils were obtained. 

 Just above PoUocksford an outcrop of yellow sandy clay was 

 found, forty-five feet above the river level, and then, a hundred 

 yards below this, columnar-basalt occupies the river bed for 

 nearly half a mile. 



Between PoUocksford and Fyansford the river skirts the 

 jurassics, which rise to over 400 feet to the south, and is hemmed 

 in on the north by basalt. We defer any discussion of this part 

 of the country to a later paper. 



The Age of the Marine Beds (Barwonian Series). 



An examination of the lists of fossils given shows that the 

 beds examined from Inverieigh to Murgheboluc are almost 

 identical with those of Red Hill, near Shelford, and of Orphanage 

 Hill, Fyansford. Lithologically the whole series, from Red Hill 

 and thence down the Barwon through Inverieigh, Murgheboluc 

 and so on to Fyansford (Orphanage Hill), are very similar, though 

 at the latter place there is far less sand, and the beds are really 

 grey marls. 



In the paper in which we proposed the names Balcombian and 

 Janjukian we indicated the existence of certain beds which 

 undoubtedly belonged to the older series comprised under these 

 two names, which are clearly distinct from the younger Kalimnan, 

 but which from the smallness of the collections available, we did 

 not care to refer definitely to either Balcombian or Janjukian. 

 In other words, the palaeontological differences between 

 Balcombian and Janjukian series, though of importance, are not 



