56

52. EXPLANATION OF THE MAPS.

Ammonites Novo-Seelandicus (v. Hauer),
inoceramus Haasti (Hochst.).

2. Strata containing coal in the West Coast, south of the
entrance of the Waikato - standstone, marl, and slate clay,
with thin, worthless seams of coal, and numerous portions of
plants, amongst which are frequently to be found in good
preservation:
Polypodium Hochstetteri (Unger),
Asplenium palæopteris (Unger);
while the Belemnites (belonging to the group of Canaliculati)
indicate the Jurassic system. The largely folded Inoceramus
and Ammonites have a greater similarity to those from the
chalk formation.

CAINOZOIC (TERTIARY) FORMATION.

Tertiary Formations are distributed over a large portion of
the Province of Auckland, for the most part in a horizontal
position.

1. Brown Coal Formation: sandstone and clay slate, with beds
of useful coal.
(a.) The Hunua coal-field, near Drury and Papakura
district, south of Auckland, discovered in the year 1858
by the Rev. Mr Purchas, and worked since 1859 by
the Waihoihoi Coal Company. The coal belongs to a
class of brown coal - to the so-called glanz and pitch
coal - and contains a fossil gum - Ambrit (Haidinger) -
which has often been mistaken for kauri gum. The
price of this coal in Auckland is 30s. to 32s. per ton.
The argillaceous slate and sandstone accompanying
this contains several bivalves and leaves of Dicotyle-
dones:
Fagus Ninnisiana (Unger),
Lorantophyllum Griselinia (Unger),
" Dubium (Unger)
Myrtifolium lingua (Unger) &c.
(b.) The coal-fields of the Lower Waikato basin - a large
brown coal basin - is situated at Kupakupa, on the
northern declivity of Hakarimata chain, but is not yet
worked.