GEOLOGY. 
114 
In descending from Mount Rochfort, and crossing in an easterly 
direction the mountain plateau, intersected by innumerable 
streamlets, the rocky walls of which everywhere ofter good 
sections, we again find ourselves, after having passed over all the 
strata before enumerated, amongst grits and shales. 
Having examined at least eighty feet of these sandstones, the 
following strata, in descending order, are met with. 
FT. IX. 
Tabular arenaceous sandstones, occasionally containing concretions of 
clay ironstone.. 30 
Coal seam 8 
Shales, with small coal-seams ......•• 20 
Grits, sometimes very micaceous, sometimes coloured by carbon . .70 
0 
2 
0 
0 
The coal seam strikes regularly from north-north-east to south- 
south-west, with a dip of 6 degrees west-north-west. I traced it 
on both sides of the valley, and followed it also in other directions, 
where transverse valleys have been cut through it. It has the 
same character as the Grey coal, as shown by the following 
analysis, made by Mr. Tatton at my request. 
ANALYSIS. 
Fuller. 
Sydney. 
Carbon 
. . . 74*24 . 
. 7413 
Hydrogen X 
Nitrogen > 
. 25-76 . 
. 25-87 
Oxygen ) 
100*00 
100*00 
It may be as well 
here to add that the analysis 
of both coals 
was made upon surface specimens, which had been exposed for 
probably an indefinite period, both to the action of the atmo¬ 
sphere and to that of water, so that we may expect, on getting 
into the seam, that the amount of carbon will be found to be 
larger. 
The valley where this coal-seam occurs lies 1,914 feet above the 
level of the sea, and as it would be almost impossible to find it 
without some mark, I have placed on the nearest hill, 200 feet 
above it, a flagstaff, which will be visible far over the plateau. 
Trom this flagstaff I took the following bearings : — 
D. M. 
Centre of highest summit of Mount Eochfort. 236 25 
Summit of Mount Frederic.11 10 
Lowest saddle between the plateau and the Orikaka . . . . 61 40 
Highest point of Mount William. 95 45 
Junction of the two streams which form the Waimangaroha . . 24 30 
Valley where the coal-3eam is exposed, about 400 yards distant . . 268 20 
I placed also another smaller flagstaff in the valley itself where 
the seam occurs. I met with a seam, which is probably the same, 
about 150 to 200 feet above the sea, in the gorge of the Whareatea 
