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than 1000 m. In NE there exist depths shallower than
200 m (near shelf).
d) The topography of the ridge is extremely complicated,
especially the crest region is divided by many different
forms while the side slopes of almost every section are
steep hut less complicated.
e) Probably there exist no ohvious connections between the
details of neighhouring sections. Continuously existing
morphological occurrences are not recognized.
f) Volcanic cones occur in several sections.
g) A deep central valley as pursuit of Heezen’s rift valley
which seems to be characteristic for the central part of
the Mid-Atlantic Ridge is not recognizable even when
almost every section has a number of small trenches on
the crest. Only in the southern most section exist two
deep and wide trenches.”
h) In spite of its outstanding features the Reykjanes Ridge
does not seem to be a special feature of the Mid-Atlan-
tic Ridge, but connected with the rift mountains farther
south.
A navigation chart including these observations has been
published in Hamburg by the German Hydrographic Office
(Deutsches Hydrographisches Institut, Hamburg, Seekarte
Nr. 256).
By examining the bathymetric map cited above, one notes
that on both flanks of the Mid-Atlantic Ridge there are two
small ridges parallel to the Reykjanes Ridge, which with
some imagination could be traced ashore in the volcanic
zone of Snaefellsnes and the eastern zone at Surtsey. Are
these ridges perhaps a continuation of tlie volcanic zones in
Iceland?
REFERENCES
Dietrich, G., 1964: Oceanic polar front survey in the North Atlantic. In:
Research in Geophysics. Vol. 2. Solid Earth and Interface Pheno-
mena, 291—308. Massachusetts Institute of Technology.