space, not exceeding fifty acres in area, I .coasted Hundreds of them, in
some places lying almost side by side, in otliem erosskxg m e another,
and varying so much in composition that the difficulty was to find
two alike. Some are almost entirely of augite, and I observed one
m u c h resembling granite in mechanical structure. In this I saw
masses of compact calcspar of a pale yellowish colour and traastweent
nature, in form, apparently, as though it had bubbled up and over
the lava rocks previous to its hardening. At a depth of about thirty
feet below the surface there occurs a kind of yellow jasper which
turns red in colour when exppsed to heat. I t is, however, not obtainable
in any great quantity. Crystals of augite occur in this valley
. embedded in the lava, which, from their perfect form, scarcely seem,
to have travelled all the way from the Sandy Bay crater. The surface •
' of the ground in many places is, similarly to Deadwood plain, thinly
c o re r e d ' f s P i ' mWmNfc. ■■ ,
Ti: ¡»n vtx* br.:xm extending
down to Manatee Buy. m w sf mmttm fe. ummiMU to that.of Turk’s
Cap * ;ak‘V'jU;sk e^-v*
Sandy Bay crater’s edge, on one side towards Man and liorse, and
on the other towards Speery, inclosing a crateriform space of some
considerable size, the most practicable descent into which, and down
. to the sea shore, is, along the ridge of an arm or lateral branch caused
by a divergence of the lava streams towards Man and Horse. This
part of the Island is certainly not without great ^interest. I t is
barren, excepting here and there, where, being inaccessible, the grass
has escaped the reach of cattle, goats, or sheep, and grown luxuriantly.
The marks of fire and fusion are evident on all sides, and the
whole valley strikingly illustrates the appropriateness of its local
name, “ Shaken Rocks.” I t certainly has been shaken and rent
throughout, and is intersected by thousands of dikes crossing one
another in every direction. 'Scarcely 'fifty square yards exist in any
part, altogether in extent about forty acres, that are not crossed by a
dike These dikes vary greatly in composition; some are highly
emmHc others ielsnathic, and in some instances these different for-
- by »de with « * other. They do not, eo
distinctly show a vitreous selvage as those on the porffe-eastern side
of the Island, thus, I think, proving the exist««*®» of g r e # » heat of
longer duration in this part. Descend*»? «»to ibe W i , i-he strata
become more augitic and basaltic in- diameter, theft lower down
EORTH .EAST VIEW OF TURKS; CAP AND- BARE