thick. They conformably underlie Piripauan sandstone and siltstone with I. aff. pacificus and I. australis and conformably overlie the type Mangaotanean. Distribution. Teratan beds are known from all Cretaceous areas north of Amuri Bluff. At Northland they consist of siltstone similar to that at the type locality. At Raukumara Peninsula they range from thin shelf sandstone at the southern and western margin of the region, through siltstone at the type locality and adjoining areas, to very thick siltstone and redeposited sandstone at the north end of the region. At the East Coast. Ranges they range from siltstone on the west to siltstone and redeposited sandstone at the coast. In East Marlborough they consist entirely of shelf sandstone and are only about 100ft thick, except at Burnt Saddle, where they consist of thick dark mudstone. The stratigraphic position of the stage is defined by many sections and is well established, Teratan fossils having been collected from about 70 localities. Macrofossils. The two key species are Inoceramus nukeus and I. opetius, Inoceramus nukeus regularly overlying I. opetius in all sections in which both are found. The only other fossils are ammonites and a single poorly preserved gastropod; an undescribed ammonite species being reported with Inoceramus opetius from western Northland, and Gaudryceras sp. and the gastropod with Inoceramus nukeus from a boulder in the middle reaches of Cover Stream, Marlborough. Microfauna. Two microfaunas (Table I) have been described by Mr. Hornibrook, “A” from Teratan beds at Coverham and “B” from Puketoro Stream (in Wellman, 1955). Table. I A B Ammobaculites sp. x x Lagenidae, moderately large x Glomospira charoides (Jones and Parker) x x Ramulina sp. x x Gyroidina aff. globosa (Hagenow) x “Anomalina” sp. x x Globigerina cretacea d'Orb. x Gaudryinella cf. delrioensis Plummer x Similar Teratan faunas occur in Northland and in the Dannevirke Subdivision. Mangaotanean Stage (Coniacian to Santonian) Type Locality. (Fig. 11). The Mangaotanean is the middle stage of the Raukumara Series. It is defined by the beds at the Mangaotane Valley Section with Inoceramus bicorrugatus Marwick. They consist of massive blue-grey siltstones and are about 500ft thick. The type Mangaotanean conformably underlies the type Teratan and conformably overlies the type Arowhanan. The name is from Mangaotane Stream, a tributary of Motu River. Distribution. The Mangaotanean is represented in the four northern Cretaceous areas; by shelf sediments in Western Northland and Eastern Marlborough, by transitional and redeposited sediments in the East Coast Ranges, and by shelf, transitional, and redeposited sediments at Raukumara Peninsula. Fossils. Inoceramus bicorrugatus Marwick is the only widely distributed macrofossil. It has been found at about 40 localities. A small, poorly preserved, and undescribed molluscan fauna (GS2566, and GS8385) occurs with I. bicorrugatus on the East Coast of the North Island near Waimarama in redeposited gritty sandstone. The Waimarama fauna contains Lucinidae (n.gen.), Opalia n.sp., aff. Cerithioderma (?) n.sp., Cymatiidae (n.gen.), aff. Perissoptera n.gen., Tudicla n.sp., Neritopsis ? sp., none of which are closely related to known New Zealand Cretaceous species. Ammonite fragments are reported to be associated with I. aff. bicorrugatus (identified by Fleming and Marwick in Lillie, 1953: 28, as Inoceramus cf. labiatus subhercynicus