108 Proceedings of the Royal Society of Victoria. 



merri and Gnotuk, close to Camperdown. A mile further north 

 their existence has been proved by well sinkings at Brock's Hill. 



The volcanic area is thickly studded w^ith tuff cones, which 

 rarely rise to more than 500ft. above the level of the plain, and 

 the tuff beds are widely spread round the bases of the hills, 

 some of which are of beautifully perfect form. The tuff or ash 

 is locally known as sandstone, and is quarried for rough mason 

 work, no clays suitable for brick-making occurring near Camper- 

 down. The decomposition of tuffs yields the rich soil for which 

 the district is famous. 



Round the shores of Lake Colongulac the ash beds are well 

 developed, and .seem, judging by their steady dip, to be a part of 

 the deposit which forms the depressed cone which shelters Lakes 

 Bullenmerri and Gnotuk, some three or four miles to the south- 

 west. 



The bones, accompained by concretionary nodules of calcareous 

 matter lie loose on the lake beach almost due north of the 

 township, and appear to come from a clay bed which occurs about 

 water level. As the banks of the lake are low it is not easy to 

 say from the evidence there displayed whether the bone bed or 

 the tuff is the older, though my impression has long been that 

 the clay was the underlying deposit. I have recently been 

 informed that in a well-sinking not far from the lake margin, 

 bones were obtained in a clay bed which was reached after 

 sinking through '' sandstone." This evidently settles the point, 

 since, as I previously remarked, the tuff is locally known as 

 sandstone. 



The tuffs forming the beautiful cone of Mount Leura, which 

 overlooks the township of Camperdown, seem to represent the 

 tinal efforts of the volcanic outburst, and to overlie those of 

 Bullenn)erri and Gnotuk, and it is under these latter tuffs, I 

 believe, that the deposit containing the bones recorded fi-om 

 this locality occurs. 



The following species have already been recorded from Lake 

 Colongulac or Lake Timbooii, which, it will be remembered, are 

 the same place. The list is compiled from the late Sir F. IM'Coy's 

 Prodromus of the Paheontology of Victoria : — 



Thylacoleo carnifex, Owen (type locality), Macropus titan, 

 Procoptodon goliah, Phascolomys pliocenus, Phascolomys sp., and 

 Canis diniro. 



