Arkell.1956.Jurassic..

456 AUSTRALASIA
collected by Mr A. P. Mason at Onewhero, about midway between Kawhia
and Auckland; it is much more coarsely ribbed than H. mediterraneum
and in this respect agrees best with H. passati (Boehm), from the Oxfordian
of Indonesia. Some 540 m. below this Mr Mason found a new genus
which cannot be placed at present.
Callovian is indicated in the South Island by a Macrocephalites from
near Nugget Point (Marwick, 1935).
The South Island has also produced a distinctively Bathonian faunule
of pelecypods on the East Otago coast: Meleagrinella cf. echinata, with
Tancredia, Pleuromya, etc. (Ongley, 1939, p. 43). This is regarded as
Temaikan. At about the same horizon on Totara peninsula 'a faunule that
is Himalayan and European Bajocian-Bathonian in its affinities' includes
Kutchirhynchia and Cryptorhynchia (Marwick, 1953, pp. 25-6). The
shallow-water sandstones and conglomerates, with granitic pebbles, are
undated. In some of the sandstone layers are stumps and trunks of trees
in position of growth. They may well be Bajocian or Upper Toarcian.
TOARCIAN
On the ocean coast south of the entrance of Kawhia Harbour, near
Ururoa Point, a 2 to 4 inch band of calcareous mudstone contains numerous
small fossils, including ammonites, brachiopods and corals. The
ammonites are species of Dactylioceras comparable with some figured
from Rotti and Japan (Spath, 1923, p. 301). Below this band are 120 m.
of greenish sandstones without fossils.
PLIENSBACHIAN
At 120 m. below the Dactylioceras bed is the top of a block of strata
180 m. thick, consisting of greywackes crowded with shells of Pseudaucella
marshalli (Trechmann). There is no intrinsic evidence of the age of these
beds, except that they are pre-Toarcian and post-Hettangian, but they
are regarded as probably Pliensbachian. They stretch for 30 miles
southwards and are also found 120 miles to the east, and again in the
South Island, on both sides of the syncline of the Hokonui Hills. Several
Pliensbachian (probably Domerian) ammonites are also known from New
Zealand, but all unfortunately from unrecorded localities: Partschiceras
partschi (Stur), Juraphyllites aff. diopsis (Gem.) and Lytoceras cf. cornucopia
(Y. & B.) (Spath, 1923, pp. 290-3).
HETTANGIAN
The lower part of the Lias consists mainly of fine-grained greywackes,
argillites and hard claystones, in which no fossils have been obtained
from the Kawhia Harbour sections. In the Hokonui Hills, South Island,
however, are fossiliferous Hettangian strata overlying sandstone with
cannon-ball concretions; they yield Psiloceras, ? Euphyllites (Spath, 1923)
and Ectocentrites cf. petersi Hauer sp. (Arkell, 1953). Above come beds
with Otapiria marshalli (Trechmann), considered 'Callovian ?' by
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