Park. — Age and Relations of Nciu Zealand Coalfields. 407 



same year Mr. McKay shows that the upper Waiteniata beds 

 rest unconformably on the hydrauUc hmestone at Mahu- 

 rangi, in this agreeing with the opinion expressed by Mr. Cox 

 in 1880 (Geol. Eeps. , 1879-80, p. 29). At the end of his report 

 Mr. McKay gives a tabulated statement of the strata passed 

 through in four boreholes put down in that year by the 

 Kawakawa Coal-mining Company in the search for coal, ac- 

 cording to which borehole No. 2 is supposed to have passed 

 through 234 ft. 2 in. of what is termed " Amuri limestone, 

 chalk marls, and chalk with flints, Nl.d." 



In my report on the Kaipara district in 1885 I included 

 the hydraulic limestone in the Cretaceo-tertiary series, and 

 placed it above the Pahi greensands, from which I made a 

 large collection of marine shells having a facies closely 

 resembling the fauna of the Waihao greensands in South 

 Canterbury.* On this occasion I distinguished two horizons 

 of greensand — namely, coal greensands, containing the Ter- 

 tiary fauna just referred to, and glauconitic greensands 

 (page 169), which I said appeared to occur at the base of the 

 Cretaceo-tertiary series, and were interbedded with a cone-in- 

 cone limestone and a calcareous sandstone, in which I found 

 remains of Inoceramus. In this report I described how the 

 Komiti beds (Mount Brown series) lay unconformably on the 

 chalky marls and hydraulic limestone. 



In my report on the Kaipara district in 18871 I again 

 described the hydraulic limestone as overlying the coal green- 

 sands, but underlying the Whangarei limestone ; but when 

 discussing the relations of the hydraulic limestone to the 

 associated beds I stated that "the relation of the hydraulic 

 limestone and underlying marly greensands is not so satis- 

 factory as might be desired" (p. 229). 



Mr. McKay, in 1888, examined the Pahi and Paparoa 

 sections, and, while agreeing with me that the hydraulic 

 limestone overlies the coal, continues as follows : " Mr. Park 

 believes that in the sections at Paparoa and Pahi there is 

 an unconformity between the beds v^ith Inoceramus and the 

 white clays under the Whangarei limestone, . . . but I 

 must say I could not convince myself of the existence of such 

 unconformity."]; 



Mr. McKay still places the hydraulic limestone above the 

 Whangarei limestone, § but is apparently doubtful of this, as 

 on page 54 he says, " The lower beds, supposed " [by the 

 author] " to be unconformable, are well developed between 



* Reps. Geol. ExpL, 1885, p. 168. 

 t Reps. Geol. ExpL, 1886-87, p. 222. 

 I Reps. Geol. ExpL, 1887-88, p. 54. 

 § Loc. cit., p. 43. 



