1859.] 



SELWYN GEOLOGY OF VICTORIA. 



149 



and sides of the passages, where narrow, were quite smoothed and 

 polished, evidently from the frequent passage of the animals that 

 have inhabited the cave. When discovered, all these passages were 

 so completely filled up with earthy matter, that no animal much 



Fig. 2. — Section of the Ravine and Cave. 



a. Tertiary basalt. b. Lower Silurian schists and sandstones. c. Mouth of Cave. 



Fig. 3. — Plan of the Bone-cave near Gisborne. 



larger than a rat could have obtained entrance ; when cleared out, 

 8ome of them were four feet high. The above would. I think, prove 

 our basaltic lava-flows, in which the cave occurs, and which rest on 

 the older gold-drifts, to be very old Pliocene. The bones are being 

 figured and described by M'Coy. 



I have sent you by this mail one of the first complete quarter-sheets 

 of my Geological Map. 1 am getting them printed in odours from 

 stone. I have now about twenty-eight such sheets ready foi publi- 

 cation, forming together a connected map extending from Port Phillip 

 Buy to Castlemaine. 



With respect to the denudation of tin- Silurian rocks, 1 do not 

 think there would beanygrea! exaggeration in saying thai thousands 



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