Thomson. — Geology of Middle Waipara and Weka Pass Districf. 355 



pebble of greywacke near Boby's Creek, while Morgan records one or two 

 very small pebbles of greywacke, together with a small rounded phosphatic 

 lump, probably a fragment of bone. I have obtained from various localities 

 rounded quartz pebbles up to | in. diameter, a subangular pebble of quartz - 

 schist 1 in. long, and flattened pebbles of schistose greywacke over 1 in. in 

 diameter. The upper part of the greensand passes by an increase of its 

 calcareous content quite gradually into the Weka Pass stone. 



The Weka Pass stone and greensand contain fossils only sparingly, the 

 chief horizon being at the transition bed of the two rocks, on the underside 

 of the overhanging blufis so commonly developed. The richest locality for 

 fossils is at Onepunga. 



Cetacean bones occur fairly commonly, but are rarely perfect. I obtained 

 an ear-bone of a whale from Onepunga. Sharks' teeth are fairly widespread, 

 and I collected the following : From Onepunga, Isurus desori and Lamna 

 apiculata ; north-west of Mount Brown, Odontaspis elegans ; cliffs overlook- 

 ing Waipara River, Isurus retroplexus, I. desori (identified by Mr. P. Gr. 

 Morgan). In addition Chapman identified the following species, believed to 

 come from the Weka Pass stone, though the exact locality is uncertain : 

 Odontaspis incurva, Odontaspis sp., Isurus desori, Carcharodon megalodon, and 

 Scomhrochqoea cf. macrophthalma (Heckel). The specimen of Carcharodon 

 megalodon was labelled " Boby's Creek," and Chapman states that he 

 examined the matrix, and had no hesitation in stating that it came from 

 the -Weka Pass stone. There is, however, no outcrop of this rock in the 

 main branches of Boby's Creek, though the specimen may have come from 

 the slopes of Mount Brown. 



Of molluscs, Pecten huttoni and Epitonium lyratum are the most abimdant, 

 and occur in the cliffs overlooking the Waipara River, north-west of Mount 

 Brown, at Onepunga, in the Weka Pass, and in the upper part of the 

 Weka Pass Stream. At Onepunga T obtained in addition Struthiolaria 

 spinosa, Euthria media (Hutt.) ?, Voluta sp. cf. protorhysa Tate, Turris alius, 

 Dentaliuni solidum, Limopsis aurita, Teredo heaphyi, and indeterminable 

 species of Atiiria, Polinices, Architectonica, Pleurotomaria, Trochus, and 

 Ostrea. From the cuesta between the Deans and the Waipawa River I 

 obtained the holotype of Lima imitata Sut., and on the opposite side of the 

 river observed casts of ribbed Pectens on the back slope of the cuesta. 



Of brachiopods, Aetlieia gaulteri is most widespread, being found at 

 Onepunga, between the Deans and the Weka Creek, and in the upper part 

 of the Weka Pass Stream. Pachymagas cottoni n. sp. has been obtained 

 from Onepunga and the clifis overlooking the W^aipara River. P. huttoni 

 has been collected at Onepunga. 



Foraminifera are fairly abundant as isolated large examples at many 

 localities, while smaller species occur throughout the rock. From a col- 

 lection made in the small gorge above the viaduct in the Weka Pass 

 Mr. F. Chapman has identified {inter alia) Clavulina antipodum Stache, 

 Polymorphina lingulata Stache, and TruncatuUna thiasa (Stache). From 

 an examination of these and other Foraminifera and the sharks' teeth he 

 considers that the rock is probably Eocene. 



Echinoid fragments and spines "are common at many localities, and 

 Graphidaria sp. and casts of other corals are found at Onepunga. 



Hutton (1885 b, c) recorded a large number of fossils from the Weka Pass 

 stone, including many of those mentioned above. The additional species (in 

 modern nomenclature) are : Scaphella elongata, Volida attenuata (cf. F. sp. 

 cf. protorhysa, above), Epitonium rotundum, Galeodea senex, Pleurotomaria 



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