Dhow Chasing in Zanzibar Waters - The Search For Mecca

APrENDix. 405
as in Abyssinia, is chiefly granite, syenite,
gncis, clay, dolomite, trachyte, and lavage Hide.)
The shape of the mountains resembles those
Adoa, but there, the transition limestone formation
shows itself by petrifactions (gonialites,
trilobites, and delthyris), chiefly, however,
secondary limestone, which shows itself by
ammonites, lithographical stone, and Terehratula
vulgaris (near Antalo the same terebratula
kind is also found, which points to the fact that
the period of the formation of Arabia must
have been identical with that of Abyssinia).
These limestone deposits at the foot of the
higher mountains are
of
only found partially and
in small quantities in the high land of Arabia-
Asin, and they are generally mixed with clay,
precisely in the same way as in many districts
of Abyssinia.
The larger limestone formations,
containing clay in larger quantities, has been
transformed in many places into dolomite by
volcanic power, and by the same process the
limestone has become separated from the clay
(there have also been gentle volcanic eruptions),
and by the change scattered on the surface as
kidney-shaped limestone, or also impressed
with dammerde, which can be recognized, as
is constantly found in ploughing.
" Excuse me for thus writing about things
irrelevant to the slave-trade, the cause of my
it