Thomson. — Geology of Middle Waipara and Weka Pass District. 363 



Turritella concava, Natica australis, Ampullina sufuralis, Verconella costata, 

 Ancilla pseudaustralis, Surcida fusiformis, Limopsis zitteli, Pecten ivilliam- 

 soni, P. huttoni, TeUina eufjonia, and Dosinia greyi. The lower shell-bed 

 lies about 30 ft. below the limestone, and is exposed in the Weka Pass 

 Stream at and below the suspension bridge, and also in the Weka Creek. 

 It yielded Magadina browni, Neothyris novara, Rhizothyris curiosa, Crepidula 

 monoxijla, C. gregaria, C. striata, PoUnices gibhosus, Galeodea sidcata, 

 Sigapatella novae-zelandiae, Latirus brevirostris, Verconella costata, V. dilatata, 

 Voluta arabica, Voluta sp. cf. protorhysa Tate, Ancilla novae-zelandiae, 

 Dentalium solidum, Placunanomia incisura, Limopsis zitteli, Pecten crawfordi, 

 P. burnetti, P. huttoni, Crassatellites attenuatus (fragments), Venericardia 

 -purpurata, Cytherea sidcata, Protocardia alata, and Thracia n. sp. The 

 upper, or Hinnites, shell-bed occurs at or near the base of .the limestone, and 

 is exposed in the railway-cutting, in the Weka Pass Stream and its tributary 

 crossing the railway-lme above the cutting, and in the Weka Creek. It 

 yielded Neothyris novara, Stethothyris sufflata, Hemithjris nigricans mut., 

 Dentalium solidum, Pecten crawfordi, P. burnetti, Hinnites Irailli, Lima 

 paucisulcata, Ostrea angasi, Cytherea sulcata, Chione stutchburyi, Cochlodesma 

 angasi, and Protocardia alata. 



The limestone (E) closing the sequence of the Mount Brown beds 

 contains a fair number of brachiopods and a few molluscs in the Weka 

 Creek, the railway-cutting, and the cuesta leading to the Omihi watershed, 

 and yielded the following species from these localities : Crepidula gregaria, 

 Galeodea senex, Ancilla pseudaustralis, Anomia trigonop)sis, Antigojta sidcata, 

 Pecten hurnetti, P. beethami, P. triphoohi Zitt. (?), P. hochsteiteri, Lima 

 paleata, Terebratulina sp. cf. cancellata Koch, Stethothyris- sufflata, Neothyris 

 novara, N. iheringi n. sp., Rhizothyris curiosa, R. media n. sp., R. scidum. 

 n. sp., R. curta n. sp., R. eUiptica n. sp., R fortis n. sp., R. obesa n. sp., 

 and Pachymagas hectori n. sp. 



As the limestone cuesta. is traced from the Weka Creek past the first 

 tributary of the Omihi Creek towards the second it exhibits no longer the 

 characteristic brachiopods and becomes more of a hard shell-bed, the shells 

 being mostly casts at the outcrop. It appears to be continuous past the 

 back of Mount Donald towards the Waikare Valley, but has not been 

 examined in this direction. 



The summit of Moimt Donald forms an outlier of beds resting on the 

 main limestone band (D). These appear to be the lower beds of the 

 Stethothyris sufflata zone. Park (1905) stated that some mile and a half 

 north of the pass, near the highest part of Mount Donald, the beds were 

 richly fossiliferous, and gave a list of forty-eight species of cetacea, fish, 

 molluscs, brachiopods, cirripedes, and echinoids. I have been unable to 

 rediscover this locality. 



Behind the cuesta of the main limestone (D), rimning from the Weka 

 Creek towards the Deans, the first cuesta is that of a shelly calcareous 

 sandstone containing fine pebbles, which lies about 120 ft. above the main 

 band (D). This is presumably the uppermost band (E). It has not been 

 recognized in the Waipara end of the district. 



Wanganuian. 



Greta B§ds. 



The Greta, or Motunau, beds of the district are a variable series of 



littoral beds, consisting largely of gravels and gravelly shell-beds, oyster-beds, 



coarse sands, and blue calcareous or sandy mudstones, with rare lignite-seams. 



