Previous Work in the District.
Hochstetter (1867) in 1859 collected fossils from the Waikato South Head, as well as from the plant-beds near Oruarangi Point, some four
miles farther south, and classed the beds containing them as Neocomian. The sand-dune area was briefly described by him, and the structure illustrated by a section across the sand-dunes near the northern end.
Park (1910) alludes to the dune formation of the sandhills, and further calls attention to the oxidation of the ironsand into hard bands of limonite.
Cox in 1876 journeyed south along the coast from the mouth of the Waikato River, but so hurriedly that he appears to have failed to observe a conspicuous unconformity in the Tertiary strata at the Kawa Stream (fig. 11) and a less noticeable one at the Waikawau Stream (fig. 9), though in his report he expressed the conviction that an unconformity existed at the base of the beds he called the “Cardita beds,” and classed as lowest Eocene in age.
Hutton (1867) had reported on the same district, and would seem to be misunderstood by Cox (1877, p. 16) when the latter quotes him as classing the Cardita beds with the Waitematas, in which he distinctly says he could find no fossils (1867, p. 16). Cox's report is somewhat confusing.
One of the most valuable contributions to the knowledge of the geology of Port Waikato district is that by the late E. A. Newell Arber (1917), who allocated the plant-beds of the Mesozoic sequence to the Neocomian. A feature of particular interest is his discovery of leaves of the angio-sperms Artocarpidium Arberi Laur. and Phyllites sp., thought by him to be amongst the earliest dicotyledons yet discovered, and, as Dr. L. Laurent says, “it is hardly possible to attach too much importance to the discoveries.”
Bartrum. (1919B) described a fossiliferous bed at the Kawa Creek, some fourteen miles south of Waikato Heads. He published a list of fossils collected from the bed, and described six new species discovered there by him (Bartrum, 1919a).
Almost the only other reference of any importance to the geology of the area studied is one by Bartrum (1917) to the discovery of several types of volcanic rocks in pebbles of conglomerates in the Mesozoic strata.*
[Footnote] * Whilst this was in press reference to the geology of the district appeared in a report by Dr. J. Henderson on the Huntly Subdivision, which was published in 14th Ann. Rep. N.Z. Geol. Surv., 1920, and distributed early in 1921.