178 Transactions. 



Park's Lower Hutchinsonian of the coastal area (see p. 78). Further, from 

 Park's description of the beds at Big Flume Creek on page 48 and page 65, 

 bed m of fig. 17 should be correlated with bed / of fig. 28, not bed g, as 

 both lie hard on the " band of semi-crystalline limestone " and represent 

 the " I sis " greensands, and the fossils of the latter horizon also occur in 

 the lower portion of bed g. The writer was unable to find the glauconitic 

 sandstone overlying ' these '' Isis'' beds, and after visiting the Big Flume 

 Greek during the present year was only confirmed in his own interpretation 

 of the section as given in a former paper (1918, p. 123). As indicated 

 there, the section is a discontinuous one, and the beds are probably faulted. 

 The highest beds exposed in the section, which crop out on the right bank 

 of the creek between the water-race and the Oamaru-Kurow main road, 

 are the '^ Isis'' greensands capping the "hard semi-crystalline limestone," 

 and the writer found no beds above them. 



In regard to this section Park (p. 65) says, " This section is" important, 

 as it shows not only the relationship of the Oamaru stone to the Hutchin- 

 sonian, but also — what is of greater significance — the relationship of the 

 Oamaru stone to the Waitaki stone." Even if the glauconitic sandstone 

 (bed g of fig. 28) does occur as shown in section above the " Isis " beds (the 

 present writer was unable to find it), no evidence has been presented to 

 show that it is the equivalent of the limestone of the Waitaki Valley near 

 Duntroon. A section is given on page 83 of the rocks near Duntroon, where 

 Park's typical Waitaki stone i& shown overlying a fossiliferous glauconitic 

 greensand. From the description of this stone in the legend it would 

 appear that the rock is a very impure limestone, but it is as pure in many 

 parts as the typical Ototaran limestone ; it is certainly arenaceous and 

 glauconitic in places, but it is undoubtedly a limestone. The analyses 

 given on page 115 (especially analysis No. 4) confirm this. 



Park gives a list of brachiopods from the glauconitic sandstone at the 

 base of the Waitaki stone (p. 83). These brachiopods have also been 

 collected from the upper part of the glauconitic limestone of Landon Creek. 

 Wherever the limestone becomes very glauconitic the brachiopods appear. 

 The upper glauconitic part of the limestone in the Landon Creek area and 

 in the Flume Creek area increases considerably in thickness, and it is this 

 portion that yields fossils similar to those at the base of the limestone near 

 Duntroon. As pointed out in a former paper, these fossils are not restricted 

 to this base. At White Rocks and at Duntroon the lower glauconitic part 

 of the limestone increases considerably in- thickness, and these brachio- 

 pods are found a considerable distance above the base of the limestone. 

 Detailed correlation is not possible until we know the downward range of 

 this brachiopod fauna in the Oamaru limestone, and its upper range in the 

 rocks of the Waitaki Valley. At present all we can state is that the 

 brachiopod fauna of the limestone in the Waitaki Valley and in the lime- 

 stone of the Landon Creek area is undoubtedly Ototaran. 



V. BORTONIAN AND WaIAREKAN LOCALITIES. 



(1.) Bortonian. 

 In his table of the Oamaruian Mollusca (p. 97) Park states that sixty- 

 four species were obtained from the Bortonian and sixty-four speci-es from 

 the Upper Waiarekan (Waiareka tuffs). This subdivision of the Waiarekan 

 of Thomson into a Lower Waiarekan (Bortonian) and an Upper Waiarekan 

 has much to recommend it. In many places in North Otago the coal- 

 grits are overlain by fine micaceous quartzose greensands, and near their 

 base hardened calcareous concretionary bands occur in which fossils are 



