Arkell.1956.Jurassic..

NEW ZEALAND 455
of strongly Mexican affinities occur. Near the base of the Heterian at
Captain King's, south of Totara Point, have been collected Idoceras cf.
humboldti Burckhardt, Epicephalites cf. epigonus (Burckhardt) and squashed
Subneumayria, all of the Mexican Lower Kimeridgian. The Mexican
Idoceras beds also occur in the South Island, as demonstrated by an
isolated find of Idoceras speighti Marshall sp. (Arkell, 1953).
FIG. 70.—Sketch-map of the outcrops on the south side of Kawhia Harbour,
New Zealand. After Marwick, 1953.
UPPER AND MIDDLE JURASSIC, UNDATED
Most of the 3000 m. of the Upper and Middle Jurassic at Kawhia
Harbour is unfossiliferous. It consists mainly of grey, slightly calcareous
mudstones, with concretions at many horizons and scattered plant remains
throughout. About the middle of the series there is a band of coarse
sandstones, grits and conglomerates, in all 60 m. thick, and similar beds
also occur near the base. Below the Ohauan and Heterian faunas just
mentioned only one horizon with ammonites is so far known, in the upper
Temaikan or the base of the Heterian at Totara Point: this yielded
Lytoceras sp. and Holcophylloceras sp. Pelecypods are more numerous
but inconclusive (Spath, 1923, pp. 294-7; Henderson & Grange, 1926,
p. 38; Marwick, 1953, p. 27). The same Holcophylloceras has been
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