There Is Then A Fault.
About 100 Yards Higher Up The Stream Black Vesicular Trap Is Seen,
Penetrating In Thin Veins The Clay Shale Of The Country,
Converting It Into Porcellanite, And Partially Crystallizing The Coal
With Which It Came Into Contact.
On the right bank of the Lofubu
there is another feeder entering that river near its confluence
with the
Muatize, which is called the Morongozi, in which
there is another and still larger bed of coal exposed.
Farther up the Lofubu there are other seams in the rivulets Inyavu and Makare;
also several spots in the Maravi country have the coal cropping out.
This has evidently been brought to the surface by volcanic action
at a later period than the coal formation.
I also went up the Zambesi, and visited a hot spring called Nyamboronda,
situated in the bed of a small rivulet named Nyaondo, which shows
that igneous action is not yet extinct. We landed at a small rivulet
called Mokorozi, then went a mile or two to the eastward,
where we found a hot fountain at the bottom of a high hill.
A little spring bubbles up on one side of the rivulet Nyaondo,
and a great quantity of acrid steam rises up from the ground adjacent,
about 12 feet square of which is so hot that my companions could not
stand on it with their bare feet. There are several little holes from which
the water trickles, but the principal spring is in a hole a foot in diameter,
and about the same in depth.
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