180 Transactions. 



that his Waiarekan tuffs at Cape Wanbrow may be partially Ototaran, 

 for he states that in this locality the Waiarekan tuffs are " over 600 ft. 

 thick — though it is possible that a portion of the latter may belong to the 

 Ototaran." The writer is in accord with this statement, and would assign 

 to the Ototaran the interbedded tuffs and limestone bands in the Shirley 

 Creek section near the Rifle Butts, which form the top of Park's Upper 

 Waiarekan. The beds immediately below the lower pillow-lava near 

 Boatman's Harbour should also be Ototaran. The various localities where 

 the Waiarekan tuffs are said to occur will now be discussed. 



(a.) Kakanvi South. — In Bulletin No. 20, section 19, page 52, shows the 

 tuffs lying beneath the Ototaran limestone, and they are doubtfully referred 

 to the Waiarekan. Above them lie 71 ft. of limestone, 24 ft. of marly clays, 

 and tufaceous matter is plentiful throughout the section. The limestone 

 (bed a) is evidently at or near the base of the Ototaran. If so, the under- 

 lying tuffs are probably Waiarekan, but they have yielded no fossils. 



(b.) Boatman's Harbour, Cape Wanhrow.- — Park in a measured section 

 (pi. ii, sec. B) shows the beds in excellent detail. A well-marked break is 

 shown below bed h'^. Discussing this unconformity. Park says that it is 

 '' apparently due to contemporaneous erosion." He further states that the 

 Oamaru building-stone " is absent, and, if not wholly, is partly represented 

 by the fossiliferous tuffs and limestones at Boatman's Harbour [i.e., by the 

 beds above the lower pillow-lava]. The brachiopods from the upper of the 

 two limestone bands at that cove are mostly those of the Kakanui limestone 

 horizon of the Ototaran [i.e.. Upper Ototaran], as also are the brachiopods 

 from the lower of the two limestone bands underlying the pillow-lava." The 

 beds referred to are shown in plate ii, section B, but in the legend these lower 

 limestone bands and interbedded volcanic rocks are not referred to any 

 horizon, although from the title of the section they are probably to be placed 

 in the Waiarekan ; yet the description of the beds does not indicate where 

 the upper limit of the Waiarekan should, be placed. From the quotation 

 given above it is clear that the lowest fossiliferous band in the section con- 

 tains characteristic Ototaran brachiopods, and underlying this band uncon- 

 formably is a great thickness of volcanic tuffs which have not yielded any 

 fossils. The fauna from this locality cannot be referred to the Waiarekan. 



(c.) Shirley Creek (see pi. ii, fig. A). — Park states that " at Shirley Creek 

 the Waiarekan tuffs are overlain unconformably by the Oamaru stone and 

 associated beds. . . . The unconformity cannot be regarded as other 

 than intra-formational." When the writer examined this section he formed 

 the opinion that the beds" above and below this so-called unconformity had 

 the same dip (1918a, p. 110, fig. 2). It is true that the upper bed (pi. ii, 

 fig. A, bed c) is a limestone band containing masses of volcanic rocks, as 

 shown by the writer in the paper just referred to ; but this is a common 

 feature in the limestone bands interbedded with tuffs, as shown by Park 

 on page 37, where he writes in reference to the two bands below the pillow- 

 lava that " these limestone beds are brecciated with angular blocks of 

 vesicular basalt." The beds referred to the Waiarekan at Shirley Creek 

 are calcareous tuffs interstratified with polyzoan limestone bands, and they 

 contain the typical Ototaran brachiopod LiotJiyrella oamarutica (Boehm), 

 and there would appear to be no reason for separating the beds between 

 bed q and bed w from the Ototaran. At the top of bed w there is an 

 undoubted physical unconformity, which probably represents the break 

 at Boatman's Harbour below bed h^ of plate ii, fig. B, as the beds that lie 

 beneath these unconformities are unfossiliferous tuffs of similar composition. 



