The Motuan is probably upper Cenomanian to lower Turonian. The top of the Motuan is the upper limit for Aucellina, a genus not known above Cenomanian outside New Zealand. On the other hand Inoceramus ipuanus closely resembles I. labiatus var. mytiloides Mantell in shape, but has better defined and more regular ribs. I. labiatus being a widely distributed lower Turonian key species, it seems likely that the upper part of the Motuan is lower Turonian. Some small forms of I. urius—the lower of the two Motuan key species—closely resemble unnamed species (BM L31220 and Sedgwick Museum B50800) from the Cenomanian of England. Three ammonites described by Wright (1957,) from the Motuan, are useful for overseas correlation: Puzosia sp. Upper Albian to Cenomanian Pachydesmoceras sp. Upper Albian to at least upper Turonian Wellmanites zelandicus Wright (cf, Eogunarites unicus) Upper Albian to Cenomanian The range is consistent with, but somewhat wider than, that suggested by the Inoceramus species. The Urutawan is probably lower Cenomanian. The age is determined from its position below the Motuan and by the affinity of the key species Inoceramus kapuus with I. crippsi Mantell given by Seitz (1956) and by Woods (1912) as being Cenomanian. The Coverian fossils were the first from the New Zealand Cretaceous to be closely dated, Inoceramus concentricus and Turrilites circumtaeniatus from the beds that now form the type Coverian being considered Albian to Cenomanian by Woods in 1917. Inoceramus sp. Z from immediately below I. concentricus is possibly related to I. anglicus Woods, and is evidence for an Albian age for the lower part. It should be noted that the Coverian fossils have not been found in the Motu Falls section or the Motuan key fossil in the Coverham section and that the stratigraphic relation of the Motuan and Coverian is consequently uncertain. The extremely low proportion of angiosperm pollens to spores in microfaunal preparations from the Coverian (Couper in Wellman, 1955: 108) indicates that angiosperms are very scarce and suggests that the Coverian is pre-Cenomanian and considerably older than the Ngaterian of the Mid-Clarence Valley in which angiosperm leaves and pollens are relatively abundant (McQueen, 1957). The Korangan is definitely pre-Motuan and probably pre-Coverian at the type locality. A lithologic correlative of the Korangan is pre-Urutawan in the Motu Falls section. An Aptian age indicated by Maccoyella magnata (Marwick, 1939) is supported by Aucellina aff. pavlowi and by the overlap of the ranges of Aucellina and Dicranodonta. Only non-diagnostic fragments of Inoceramus and ammonites are known. The Mokoiwian is probably either lower Aptian or upper Neocomian, but the age is not well known. No overseas correlative is known for the key species Inoceramus warakius, which occurs in the Coverham section immediately below the Wharfe Sandstone and about 1,000ft stratigraphically below the base of the Coverian, and is almost certainly pre-Albian. A possible lower limit for the Mokoiwian is set by Globigerina, described in a manuscript report by Finlay as being found at the type locality and not known with certainty overseas before the upper Neocomian (Glaessner, 1945: 203). The Mokoiwian underlies a lithologic correlative of the Korangan, but nowhere are the two stages in sequence and fossiliferous, and overlap is possible. No ammonites are known. Climate There is nothing to suggest that the climate in New Zealand during the Cretaceous was either tropical or cold. That it was temperate is based on negative rather than