Saratoga Chalk, also of Navarro age (see Cushman, Journ. Pal., vol. 5, No. 4, p. 310, 1931), is the conspicuous species Gyroidina globosa v. Hag.; this is equally conspicuous in almost every Piripauan fauna, but absent above and below, and does not seem to be in the American Taylor or Midway. Rotamorphina cushmani Finlay is known only from our Upper Piripauan and this same Upper Navarro Trinidad horizon. The Trinidad fauna has very much in common with our highest Piripauan, and has been regarded by Cushman as most similar to the Mexican Velasco (Tamesí of Muir) and equivalent to the Texan Navarro, but many micro-palaeontologists, including Thalmann, Plummer, and Dorr, regard it as younger—even Paleocene. The late J. M. Muir stated in a personal letter discussing the problem that “The Tamesí is certainly post-Maestrichtian and definitely pre-Midway (of Texas). The inference is that the beds are probably Danian.” An important connection is furnished by the extreme similarity of some Piripauan faunas to those of the Burdwood Bank Uppermost Cretaceous described by Macfadyen (1933, p. 4). All the species he figures (except Pseudotextularia) are conspicuous in, and all but one limited to, the Piripauan. of particular interest is the genus Rzehakina Cushman (see Finlay, 1939B p. 534), which is abundant in and highly characteristic of the North Island Piripauan (the Tapuwaeroa and restricted Mangatu formations); the known occurrences of R. epigona (Rzehak) in the Middle and Upper Velasco of Mexico, the Upper Navarro of Trinidad, the Maestrichtian and Danian of French North Morocco, and the “Alttertiar” of Austria (which Glaessner has shown to be really late Cretaceous) support a conclusion that the age of such New Zealand beds must be close to the Tertiary boundary; certainly no older than Santonian (if as old), and no younger than Danian. Geographically the nearest Cretaceous faunas comparable to those of New Zealand are in the different Gingin horizons in West Australia, which Whitehouse (1926, p. 279) refers to the Lower Santonian, though Crespin (1938, p. 395) thinks that the full range from Cenomanian to Campanian may be present. These faunas in their species of Globotruncana, Gümbelina, Clavulina, Bolivinita, Eouvigerina, and Frondicularia are much more directly comparable with those of the Selma and Annona chalks of the American Taylor, and are more obviously Cretaceous than much of the Piripauan—it is indeed very possible that some of them correlate better with the top of the Clarentian between the Raukumara and Tapuwaeroa. The highest parts of our Cretaceous (Wangaloa beds, Amuri “Teredo Limestone”) have yielded no micro-faunas at their type localities. Tertiary. (a) Eocene. No Lower Eocene has been recognised in New Zealand. A sharp change is already visible in the Lowest Bortonian, and there are no Cretaceous lingerers as in the Texan Midway. A form deceptively like Eouvigerina does occur, but is a more advanced development, and has been separated as Zeauvigerina Finlay (1939B, p. 541).