The Same Stratum Appears To Have Run From South To
North, Upwards Of Two Hundred Miles.
This hill is certainly its northern
termination, since beyond it the low and marshy plains of the interior
commence.
At one o'clock we arrived under the hill which Mr. Evans had
previously ascended: at this spot I intended to remain a couple of days,
as well to refresh the horses, as for the purpose of ascending Mount
Exmouth, from whence I promised myself an extensive view of the country
over which our intended route lay. On ascending the hill before
mentioned, I was surprised with the remarkable effect which the
situation appeared to have on the compass. The station I had chosen was
the highest part, and nearly the centre of the hill; placing the compass
on the rock before me, the card flew round with extreme velocity, and
then suddenly settled at opposite points, the north point becoming the
south. Astonished at such a phenomenon, I made the following
observations. The compass on the rock, Mount Exmouth, bore S. 60. W.
(its true bearing being N. 75. E.), and on raising it gradually to the
eye, the card was violently agitated, and the same point now bore
N. 67. E. About one hundred yards farther south, the compass was again
placed on the rock; the effect on the compass was very different, Mount
Exmouth bore E. 48. S., and the tent in the valley beneath S. 74. W. The
card on raising the compass was rather less agitated than before, and
from
the eye, Mount Exmouth bore N. 77.
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