FIJI-NEW ZEALAND EXPEDITION | 303 
the Rangitoto quarry is operated on an extensive scale. The face 
is three hundred to four hundred feet long and twenty to thirty 
feet high. The hardened flows are vesicular basalt rich in olivene. 
Intermingled with these are scoria, slag, and clinker. The latter 
are crushed and screened and yield a filler for concrete, thought 
to be superior to gravel. More than one hundred men are em- 
ployed working eight-hour days. They are paid from one shilling 
tenpence to two shillings sixpence per hour depending on the 
kind of work they do. 
The voleanie rock toward the edges of Rangitoto is quite thin 
as may be seen at the quarry whose main building is supported 
on piling driven into the ‘‘papa’’ rock at the water’s edge. Ap- 
parently the period of voleanie activity is considerably later 
than the laying down of the ‘‘papa’’ rock although a considerable 
amount of volcanic ash is interbedded with the clays and sands 
of that formation. In places its evenly laid strata are sharply 
folded and occasionally faulted by the thrust of the penetrating 
lavas. 
Across a shallow narrow strait from the Harbor Board Quarry 
is the island of Motutapu composed almost entirely of a pile of 
the Waitemata beds left as an erosion remnant. In a rubbly 
fossil-bearing zone near the water level is found the remains of a 
giant Tertiary cirripede, known as Scalpellum aucklandicum. We 
were fortunate in securing a few of the plates of this rare barna- 
cle. 
THE ROTORUA LAKE DISTRICT 
On July 15, my aide, Mr. Glock, and I left for the hot lakes 
and geyser district at Rotorua. Through Mr. Wallnut of the 
Government Tourist Bureau we had purchased transportation 
good on all railroads, lake boats, and mail-carrying automobiles 
connecting or extending rail terminals. These tickets, costing 
£16-5-0 each, were good for sixty days, first class. They proved 
a great convenience for as we were in a sense guests of the goy- 
ernment, our movements were anticipated, and we found someone 
at every point ready to receive us and direct us how to make the 
best connections, find suitable hotels, or see such geological phenom- 
ena as we had come to study. 
The Waikato valley south of Auckland is a rich district in 
which dairying, grazing, and the growing of small crops are the 
