﻿Vol. 66.] AND DA CITES OF THE DANDENONG DISTEICT. 469 



and conspicuously foliated, but doubtless of igneous origin. At the 

 junctions tourmaline was found, not only in the Feldstein, but 

 frequently also in the diorite. On the strength of this fact, it 

 seemed desirable to institute a search for tourmaline along the 

 border of the Victoria intrusive. 



Mr. A. Wade said that he was much interested in the paper, 

 having just had an opportunity of observing an apparently similar 

 intrusion of a granitic mass into more basic rocks, with resulting 

 foliation of both, upon the island of Shadwan in the Red Sea. He 

 asked the Author whether he could assign an age to the intrusion 

 of the granodiorite. 



The Author thanked the Fellows for their reception of his 

 paper. In answer to Dr. Young, he stated that a great thickness 

 of dacite was intruded and extruded before the granodiorite was 

 intruded into it. Tourmaline had not been recognized in the 

 granodiorite, but occurred in some of the acid veins proceeding from 

 it and traversing the gneiss and dacite. The veins appeared to be 

 aplitic in the field, but their texture was hypidiomorphic to 

 graphic. 



In answer to Mr. Wade, the Author agreed that the comparison 

 with intrusions in the Red Sea area was interesting; but a difference 

 arose, inasmuch as in the Dandenong area the granodiorite was 

 quite unfoliated, whereas the granite mentioned by Mr. Wade was 

 foliated near its boundary. 



The age of the granodiorite of the Dandenong area could not 

 be fixed with certainty. It was intrusive into Lower Palaeozoic 

 sediments, and probably belonged to the lower part of the Devonian 

 Period. 



