408 Traiuactions. — Geology. 



Mauiigaturoto and Colbeck's estate, and appear in that direc- 

 tion perfectly conformable to the hydraulic limestone ; and 

 all over the west of the Bay of Islands County and in the 

 Hokianga district 1 judged the relations of the hydraulic 

 limestone to the Inoceranms beds to be a relationship showing 

 the stratigraphical conformity of the higher and lower beds 

 mentioned." 



Mr. McKay, in 1890, in his report " On the Prospects of 

 Coal at Pakaraka, Bay of Islands, Auckland," again affirms 

 his belief that the hydraulic limestone overlies the Whangarei 

 limestone. Speaking of the section at Ngahikunga, he says, 

 "The limestone" [Whangarei] "is overlain by the firestcne 

 and hydraulic limestone division of the Cretaceo-tertiary 

 series."* 



In the same year Mr. McKay, reporting on the geology of 

 the district around Whangaroa Harbour, states that in the 

 north branch of the Kaeo River the hydraulic limestone forms 

 "the highest member of the" [Cretaceo-tertiary] "series,"! 

 and is, he continues, overlain, apparently conformably, by the 

 Kaeo greensands, that had always been regarded by the Geo- 

 logical Survey as the equivalent of the Kawakawa greensands 

 forming the roof of the coal. As the hydraulic limestone was 

 still supposed to overlie the coal greensands, the Kaeo green- 

 sands, since they followed the hydraulic limestone, were now 

 correlated with a horizon in harmony with that theory. 



In 1892 Sir James Hector illustrates his Progress Report 

 with vertical sections of the boreholes put down by the Kawa- 

 kawa Coal Company in 1883, and shows, as did Mr. McKay, 

 the " Amuri limestone, chalk, chalk with tiints, VI. c/," over- 

 lying the Whangai'ei limestone.]: 



Mr. McKay, in his report "On the Hikurangi Coalfield" 

 in 1892, shows the hvdraulic limestone as the closing member 

 of the Cretaceo-tertiary series, and, as in former reports, k is 

 shown overlying the Whangarei limestone conformably. i 



The succession of beds on the south side of Parengarenga 

 Harbour, in the North Cape district, is stated by Mr. McKay 

 to be, in descending order — hydraulic limestone, firestones 

 interbedded with greensand, shales and sandstone with cal- 

 careous concretions, often covered with a layer of cone-in-cone 

 limestone, and containing fragments of Inoccravius.\\ This 

 section, it will be seen, is almost identical with that at Batley, 

 on the Kaipara. 



Sir James Hector, m his Progress Report for 1903, 



• Reps. Geol. Expl., 1890-91, p. 62. 



t Loc. cit., pp. 68 and 69. 



J Reps. Geol. Expl., 1892-93, p. xii. 



§ Loc. cit., p. 57. 



II Loc. cit., p. 86. 



