482 Transactions. 



rnent found in the neighbourhood of limestone or of glauconitic 

 sands. 



In conclusion, I should like to express my gratitude to 

 Mr. R. Ewing, of the Clarendon Phosphate Company, and to Mr. 

 F. Oakden, of the Millburn Lime and Cement Company, for their 

 kindness in allowing me to make use of several of their analyses 

 of rock-phosphate, and for their unvarying courtesy during the 

 examination of the deposits. To Professor Park for his lucid 

 and instructive report, to Dr. Marshall, Dr. Benham, Mr. A. 

 Hamilton, and Mr. D. B. Waters for their valuable advice and 

 assistance during the preparation of this paper, my warmest 

 thanks are due. 



EXPLANATION OF PLATES IV-VIII. 

 Plate IV. 

 Fig. 1. Squalodon grateloupi (?) : a, premolar, showing enamel; b, crown 

 of worn molar ; c, section of b close to top of crown ; d, section 

 of b nearer the fangs ; e and /, molars. 

 Fig. 2. Balsenoid whale, dentory : a, view from above ; b, view along jaw. 

 Fig. 3. Magellania marshalli : a, both valves ; b, side view. 



Plates V-VII. 



Fig. 1. Glauconitic limestone (B). 



Fig. 2. Glauconitic limestone. 



Fig. 3. Basalt, Stony Knob, crossed nicols ; x 80 dias. 



Fig. 4. Basalt, Williamson's, crossed nicols ; x 80 dias. 



Fig. 5. Basalt, Cemetery Hill, crossed nicols ; x 80 dias. 



Fig. 6. Sandstone ; x 80 dias. 



Plate VIII. 

 Geological map of Clarendon-Millburn district, with ideal section. 



Art. LIII. — The Gem Gravels of Kakanui ; with Remarks on 

 the Geology of the District. 



By J. Allan Thomson, B.Sc, Rhodes Scholar. 



Communicated by Geo. M. Thomson. 

 [Bead before the Otago Institute, 14th November, 1905.] 

 There have long been in the collections of the Otago Museum 

 and of the Otago School of Mines specimens of sands from 

 Kakanui, labelled " gem sands." The late Professor Ulrich, 

 Director of the Otago School of Mines, was of opinion that 

 gems would some day be found at Kakanui, evidently being 

 struck by the association of minerals which these sands con- 

 tained. Their investigation seems desirable both from a theo- 

 retical and a practical point of view. In the investigation of 



