430 Transactions. 



it was pre- Jurassic, but the conviction grows upon the writer that Pro- 

 fessor Park's (Park, 1893, pp. 358-59) early view of the great scientific 

 importance of the discovery made nearly thirty years ago of gneissic rocks 

 in the King-country was not an exaggerated one.* 



Summary and Conclusion. 



In the Albany-Riverhead district conglomerate bands occur in the 

 Waitemata (probably Upper Miocene) beds, two of which are particularly 

 well exposed near Albany, and contain material of very varied petrographic 

 nature. The various igneous types are described above, and it is pointed 

 out that the gneissic rocks there and in other conglomerates elsewhere in 

 the North Island perhaps furnish evidence of a terrain injected by batho- 

 lithic intrusions, subjected to compressional stresses and eroded before the 

 deposition of the main mid-Mesozoic sequence of the North Island. 



The occurrence of anorthosite is particularly interesting in view of the 

 limited distribution of this type of rock. 



In conclusion, the author would like to thank Mr. A. H. Bowell, 

 of Auckland University College, for performing chemical tests upon the 

 anorthosite, and Dr. J. A. Thomson, Director of the Dominion Museum, 

 for most valuable help in the determination of this same rock. 



List of Papers cited. 



Bartrum, J. A., 1917. Additional Facts concerning the Distribution of Igneous Rocks 



in New Zealand, Trans. N.Z. Inst., vol. 49, pp. 418-24. 

 Bell, J. M., and Clarke, E. de C, 1909. The Geology of the Whangaroa Subdivision, 



Hokianga Division, N.Z. Geol. Surv. Bull. No. 8 {n.s.). 

 Cotton, C. A., 1916. The Structure and Later Geological History of New Zealand, 



Geol. Mag. {n.s.), dec. 6, vol. 3, pp. 243-49 and 314-20. 

 Cox, S. H., 1881. Geology of the Rodney and Marsden Counties, Bep. Geol. Ezplor. 



during 1879-80, pp. 13-39. 

 Fox, C. E., 1902. The Volcanic Beds of the Waitemata Series, Trans. N.Z. Inst., 



vol. 34, pp. 452-93. 

 Fraser, C, and Adams, J. H., 1907. The Geology of the Coromandel Subdivision, 



Hauraki, Auckland, N.Z. Geol. Bull. No. 4 {n.s.). 

 Henderson, J., 1914. Coal Possibilities of the Warkworth District, 8th Ann. Bep. {n.s.) 



N.Z. Geol. Surv. 

 McKay, A., 1884. On the Geology of the Kawhia District, Bep. Geol. Ezplor. during 



1883-84, pp. 140-48. 

 Marshall, P., 1904. Boulders in a Triassic Conglomerate, Nelson, Trans. N.Z. Inst., 



vol. 36, pp. 467-71. 



1908. Geology of Centre and North of North Island, TraTis. N.Z. Inst., vol. 40, 



pp. 79-98. 



1911. New Zealand and Adjacent Islands, Handbuch der regionalen Geologie, 



pp. 20 et seq. 

 Morgan, P. G., and Bartrtjm, J. A., 1915. The Geology and Mineral Resources of the 



BuUer-Mokihinui Subdivision, West port Division, N.Z. Geol. Surv. Bull. No. 17 



(n.s.). 

 Park, J., 1893. On the Occurrence of Granite and Gneissic Rocks in the King-country, 



Trans. N.Z. Iiut., vol. 25, pp. 353-62. 

 SoLLAS, W. J., and McKay, A., 1906. The Bocks of Cape Colville Peninsula, vol. 2. 



f 



* The writer would add that since writing the above he has been fortunate enough 

 to find several bands of conglomerate in the " Maitai " rocks outcropping in the north 

 of Great Barrier Island, and that in these bands there are abimdant granite boulders 

 and occasional garnet-granulites, if macroscopic appearances are not deceptive. 



I 



