426 GEOLOGICAL NOTES, 



Series near Dubbo. This series is considered by Mr. C. S. 

 Wilkinson, F.G.S., and by Father Curran to be probably older 

 than the Hawkesbury Sandstone proper, and perhaps to be the 

 equivalent of the Narrabeen Series, in which case it would pro- 

 bably be of Triassic age. Mr. Whitelegge records a similar 

 occurrence of leaflets of Thinnfeldia in a band of carbonaceous 

 clay shale in the Hawkesbury Sandstone at WooUoomooloo near 

 Sydney, a geological horizon probably also referable to the Trias. 



(3) Note on the Occurrence of Andesitic Lavas at the 

 Canoblas, near Orange. 



At the above locality are the remains of an extremely inter- 

 esting extinct volcano, which has so far been very little studied. 

 Mr. C. S. Wilkinson made a cursory visit to the Canoblas in the 

 year 1878, and at once concluded from the scoriaceous character 

 of the lavas at the summit of the " Old Man Canoblas," as well 

 as from the great altitude and isolated character of the hill that 

 it had at one time formed a point of volcanic eruptions on a 

 somewhat grand scale. In January of this year, at the meeting 

 of the Australasian Association for the Advancement of Science, 

 a note was read by the Rev. J. Mihie Curian, F.G.S., recording 

 the occurrence of a nepheline-bearing basalt, which had evidently 

 flowed fiom the neighbourhood of the Canoblas, near Orange. 

 The author is not aware of any further published accounts of the 

 Canoblas or of their lavas. Mr. G. A. Stonier, Geological Sur- 

 veyor, and the author on July 5th last, ascended to the summit of 

 the " Old Man Canobla," by the road which branches from the 

 main Orange to Cargo road at German's Hill. 



At a point about 1^ miles along the branch road a bed of thick 

 volcanic tufi" outcrops, composed of an ochreous base containing 

 fragments of lava and scoriae of an andesitic rather than a basic 

 type, together with beautifully perfect crystals of black augite 

 from ;^ to f of an inch in length. 



From here to near the summit the road passes over sheets of 

 dense lava rendered porphyritic by crystals of triclinic felspar, 



