54

50 EXPLANATION OF THE MAPS.

sketched always on the spot, and in this manner I returned
with materials from which I compiled in Auckland a map of
the Southern part of that Province, on a large scale. *

This map has been re-cast and revised with the assistance of
my original sketches and surveys, by Dr. A. Petermann, and
the map in this Atlas, in the reduced scale, is the product of
his labour, and the result of my observations. It stands to
reason, that a map which contains nearly 2,500 miles (10,000
square miles) and embraces more than the fourth part of the
Northern Island, executed by the assistance of a compass
alone, within the period of three months, can make no preten-
sions to a trigonometric exactness. It is, however, the first
map which gives a correct view of the rivers and mountain
systems, and of the lakes in the interior of the Northern
Island, and will be useful until some better and more complete
map takes its place. The Barometrical measures which I took
served as corresponding observations to those of the Obser-
vatory of the Royal Engineers in Auckland, which were kindly
placed at my services by Colonel Mould.

The geological condition of the Southern part of the Province
of Auckland may be sketched in the following order:-

PALÆOZOIC (PRIMARY) FORMATION.

Dark coloured claystone, old standstone called grauwacke,
silicious and jasparoid slate, form a complex system of layers,
_________________________________________________________
* A copy of my original map, to the scale of 2 miles to 1 inch, re-
mained in Auckland for the use of the Government. A second copy was
sent to Mr. J. Arrowsmith, in London, to be used for the construction
of a large New Zealand map in six parts, which that gentleman
intended to compile, with the understanding, however, that this
map was to be used only as a provisional delineation of my observa-
tions. The Geological map of the Province of Auckland, which was
exhibited in the International Exhibition of London, in 1862, by
Mr Charles Heaphy, was entirely a copy and combination of my maps
and surveys, without any acknowledgment of my authorship. The
map, also, of the Isthmus of Auckland, given in the Quarterly Journal
of the Geological Society of London, by Mr Charles Heaphy, was pub-
lished without my knowledge, and is a very incomplete copy of my obser-
vations and maps, which were in Mr Heaphy's official charge. In this
map that gentleman also introduced his own observations upon the
geological formations of the neighbourhood of Auckland, made previous
to my arrival in New Zealand, but without possessing even the most
elementary knowledge necessary for making a Geological survey. I have
felt it my duty to make these remarks out of respect for truth and
science.