Inoceramus tawhanus, and Inoceramus hakarius. The beds are at least 1,500 feet thick and consist of dark siltstone with bands of redeposited sandstone. The name is taken from Ngateretere Survey District. The stage is conformably overlain by Arowhanan beds with the key fossil Inoceramus rangatira, and is conformably underlain by the type Motuan. Distribution. The Ngaterian Stage is represented in western Northland by siltstone with bands of redeposited sandstone that contain Inoceramus tawhanus at two localities. It is represented by a wide variety of sediments in Raukumara Peninsula: by shelf or transitional sediments at Waiotahi River and at Winding Stream, and as boulders composed of shelf sediments in Haumurian beds at “Port” Awanui; and by redeposited beds at the Motu Falls Section and near Ruatoria at Wairongamai and Waingakia streams. In the East Coast Ranges the Ngaterian Stage is known definitely only by massive mudstone which appears to disconformably underlie Haumurian beds at Tangaruhe Stream near Porangahau and by redeposited beds near Flat Point. In East Marlborough it is represented by two very different kinds of deposits: at Coverham by massive mudstone (Sawpit Mudstone and the upper part of the Cover Mudstone, Wellman, 1955), and in the middle Clarence and Awatere Rivers by basalts and fossiliferous tuffs. Inoceramus? fyfei occurs in alternating sandstones and mudstones in beds mapped by Suggate (1958) as Split Rock formation (Motuan). The beds are possibly overturned and part of his Gridiron Formation (Ngaterian) and not unconformably below it as described. Macrofossils. The shelf sediments contain a variety of fossils, only some of which have been described. Fossils collected from the tuffs in the Middle Awatere River by McKay (GS741) were described by Woods. The following list has been revised by Dr. C. A. Fleming: Barbatia cf. marullensis (d'Orb.) Modiolus cf. kaikourensis (Woods) Ostrea sp. Esalaevitrigonia meridiana (Woods) Nototrigonia n. sp. Spondylus cf. striatus Sow. Camptonectes sp. Syncyclonema cf. orbicularis (Sow.) “Lima” marlburiensis (Woods) Inoceramus tawhanus (Wellman) Panopea awaterensis Woods McKay's collection (GS615) from the mid-Clarence probably includes some Arowhanan species. It is listed by Fleming in Suggate 1958: 404. Ammonites are the most important fossils for dating this stage as Turonian. Otoscaphites awanuienses Wright was found in a boulder at Port Awanui with Inoceramus tawhanus and other mollusca, and Hyphantoceras cf. reussianum with Inoceramus aff. costellatus in a boulder at Wharfe Stream junction near Coverham, that probably comes from upper Ngaterian beds. The two ammonites are closely related to European upper Turonian forms (Wright, 1957). Mr. A. Russell, of the British Petroleum Company, recently collected Mariella cf. lewisensis (pers. comm. Mr. C. W. Wright) from dark mudstone 200 feet below Inoceramus hakarius and I. fyfei half a mile south of Matawai. Foraminifera. (N. de B. Hornibrook). Distinctive microfaunas consisting mostly of calcareous species occur in the Sawpit and Cover mudstones of Coverham and in the mudstone at Tangaruhe Stream. They contain the following species, but have not been fully studied: Lagenidae, small and distinctive Anomalinidae, small and distinctive Gyroidina, tiny and like G. nitida Reuss “Bulimina”, tiny