Broadgate. — TJie ''Red Rocks'" and Associated Beds. 85 



" EeD KoCKS " ELSEWHERE. 



Tlie term " jasperoid rock " has frequently been used in describing 

 these developments (14 ; 17, p. 2 ; 35 ; 36). On examining samples from 

 Marlborough and Hawke's Bay I conclude that these rocks did not differ 

 originally from those described above. In the jasperoid rocks silicification 

 has taken place on a microscopic scale throughout the rock, while in the 

 case of the red argillites of Wellington Peninsula the introduction of silica 

 has resulted in the formation of quartz veins. In all cases it seems likely 

 that the various metalliferous ores reported in connection with the red rocks 

 have been introduced as an accompaniment of the silicification. 



References. 

 (1.) J. M. Bell. "The Physiography of Wellington Harbour." Trans. 



N.Z. Inst., vol. 42 (1910), pp. 534-40. 

 (2.) J. A. Thomson. " Mineral Prospects of the Maharahara District. 



Ha\\-ke"s Bav." Mines Statement for 1913, N.Z. Pari. Paper C.-2 



(1914), pp. 162-70. 

 (3.) A. McKay. " Report on the Recent Seismic Disturbances within 



Cheviot County in Northern Canterbury and the Amuri District 



of Nelson." Wellington, 1902. 

 (4.) C. A. Cotton. " Notes on Wellington Physiography." Trans. N.Z. 



Inst., vol. 44 (1912), pp. 245-65. 

 (5.) A. McKav. " Report on the Tertiary Rocks at Makara." N.Z. 



Geol. Siirv., Rep. Geol. Explor. during 1874-76 (1877), p. 54. 

 (6.) A. McKay. " The Geology of the Neighbourhood of Wellington." 



N.Z. Geol. Surv., Rep. Geol. Explor. during 1878-79 (1879). 



pp. 131-35. 

 (7.) J. Hector. Progress Report. N.Z. Geol. Surv., Rep. Geol. Explor. 



during 1878-79 (1879), pp. 1^1. 

 (8.) A. McKay. '' On the Tauherenikau and Waiohine Valleys, Tararua 



Range." N.Z. Geol. Surv., Rep. Geol. Explor. during 1887-88 



(1888), pp. 58-67. 

 (9.) J. M. Bell. " The Geology of the Parapara Subdivision, Karamea, 



Nelson." N.Z. Geol. Surv. Bull. 3 (n.s.), 1907. 

 (10.) Hatch and Rastall. "Text-book of Petrology: The Sedimentary 



Rocks." London, 1913. 

 (11.) J. M. Bell. " The Geology of the Hokitika Sheet, North Westland 



Quadrangle." N.Z. Geol. Surv. Bull. 1 (n.s.), 1906. 

 (12.) P. G. Morgan. " The Geology of the Mikonui Subdivision, North 



Westland." N.Z. Geol. Surv. Bull. 6 (n.s.), 1908. 

 (13.) C. A. Cotton. '' Supplementary Notes on Wellington Physiography." 



Trans. N.Z. Inst., vol. 46 (1914), pp. 294-98. 

 (14.) A. McKay. " On the Copper-ore at Maharahara, near Woodville." 



N.Z. Geol. Surv., Rep. Geol. Explor. during 1892-93 (1894), p. 3. 

 (15.) J. A. Thomson. " The Petrology of the Kalgoorlie Goldfield." 



Quart. Journ. Geol. Soc, vol. 69 (1913), pp. 621-77. 

 (16.) R. A. Daly. " Igneous Rocks and their Origin," New York, 1914, 



p. 27. 

 (17.) A. McKay. " On Mineral Deposits in the Tararua and Ruahine 



Mountains." N.Z. Geol. Surv., Rep. Geol. Explor. during 1887-88, 



(1888). 

 (18.) C. Eraser. " The Geology of the Coromandel Subdivision, Hauraki, 



Auckland." N.Z. Geol. Surv. Bull. 4 (n.s.), 1907. 



