,
IN TIME AND SPACE
233
of great depth. East Africa, Natal and northwards, came
into touch With the Indian Ocean about the middle of the '
Mesozoic period (Jurassic and Wealden), since the Chalk
'
deposits there contain the same families as the late ]ura;of
India.
On both points, therefore, the distribution ;is in
agreement With Wegener’s theory of
nect10ns.
_=_
.
…
To account for the Wide distribution of the early TeleoStS
and Dipnoi in the northern hemisphere, Consequeny, it
_
is necessary to believe that“ a broad communication existed
during the Palæozoic and early Mesozoic perio‘ds between
—
?
""Ÿ’4
'
—
—
—
gare … ‘vo
_—
,FIG56—Presumed distribution of
in
_
="thë‘h0rther he1isphere- durig=thé‘
théoccûrrence of
_
the Indian Ocean or
the Waters
and North America.
This communication, varying no
,
at different times, must have extendedfrom at least—
the _Great Lakes across Newfoundland, Britain, Central
'
Syria, the Caspian Sea, and farther east
perhaps—jacross.:the region Where the Himalayas now: stand}. ‘
_
.
believe that this was one;
sheet of
communications .Wer‘eàof gï@êî "
breadth;
änd
'
the
_
.
'
..
Some of —thes_e{-_WaterWayS.must haverun
5:
,
‘