With banks of gravel.
| Lake Dilolo.
C| TUFA AND TRAP. In Londa, the bottom of the valley
E| 2500 feet. is formed of ferruginous conglomerate on the surface;
N| Lake Ngami. hardened sandstone, with madrepore holes,
T| banks of gravel, and occasionally trap;
R| south of 12 Degrees, large patches of soft
A| TUFA. calcareous tufa, with pebbles of jasper,
L| agates, &c., lie on various horizontal traps,
| amygdaloids with analami and mesotype, which is
P| burst through by basaltic rocks forming hills,
L| and showing that the bottom of the valley
A| RADIATED ZEOLITE. consists of old silurian schists;
T| there are also various granitic rocks
E| cropping through the trap.
A|
U| BASALTIC ROCKS. Augitic porphyry and basalt,
.| with tufa over it.
Place of Great Cataract.
MICA SCHIST. White mica schist dipping west, and gneiss.
5000 feet. Kalomo.
Water boils GRANITE. With black mica.
at 202 Deg.
MICA SCHIST. White mica schist and white marble.
Hill tops TRAP. Hot fountain; conical hills of igneous rocks,
4000 feet. containing much mica.
Bottoms 3500 feet.
MICA SCHIST. Pink marble dolomite,
on hills of mica schist, of various colours, with trap,
schorl in gneiss, kyanite or disthene gneissose mica
in the schist.
1500 ft. COAL IN SANDSTONE. Specular and magnetic iron
on various igneous rocks; finely laminated porphyry;
granite; hot fountain.
Sandstone overlying coal; trap dykes;
syenitic porphyry dykes; black vesicular trap,
penetrating in thin veins the clay shale of the country,
converting it into porcellanite, and partially
crystallizing the coal. On this sandstone
lie fossil palms, and coniferous trees
converted into silica, as on a similar rock in Angola.
COMPACT SILICEOUS SCHIST.
IGNEOUS ROCKS. Trappean rocks, with hot fountain.
CALCAREOUS TUFA. Arkose, or granitic grit,
with modern shells covered by calcareous tufa.
Sea.
EAST.
The heights are given as an approximation obtained from observing
the boiling point of water, they are drawn on a scale of 1/10 of an inch
per 1000 feet in altitude. The section is necessarily exaggerated
in longitude, as it was traversed in different latitudes,
the western side being in 8d-12d, the eastern 15d-18d S.
==
We can see from this hill five distinct ranges, of which
Bolengo is the most westerly, and Komanga is the most easterly.
The second is named Sekonkamena, and the third Funze.
Very many conical hills appear among them, and they are generally
covered with trees. On their tops we have beautiful white quartz rocks,
and some have a capping of dolomite. On the west of the second range we have
great masses of kyanite or disthene, and on the flanks of the third and fourth
a great deal of specular iron ore which is magnetic, and containing
a very large percentage of the metal. The sides of these ranges
are generally very precipitous, and there are rivulets between
which are not perennial.
