In The Malay Archipelago We Have, I Believe, A Case Exactly
Parallel To That Which I Have Here Supposed.
We have indications
of a vast continent, with a peculiar fauna and flora having been
gradually and irregularly broken up; the island of Celebes
probably marking its furthest westward extension, beyond which
was a wide ocean.
At the same time Asia appears to have been
extending its limits in a southeast direction, first in an
unbroken mass, then separated into islands as we now see it, and
almost coming into actual contact with the scattered fragments of
the great southern land.
From this outline of the subject, it will be evident how
important an adjunct Natural History is to Geology; not only in
interpreting the fragments of extinct animals found in the
earth's crust, but in determining past changes in the surface
which have left no geological record. It is certainly a wonderful
and unexpected fact that an accurate knowledge of the
distribution of birds and insects should enable us to map out
lands and continents which disappeared beneath the ocean long
before the earliest traditions of the human race. Wherever the
geologist can explore the earth's surface, he can read much of
its past history, and can determine approximately its latest
movements above and below the sea-level; but wherever oceans and
seas now extend, he can do nothing but speculate on the very
limited data afforded by the depth of the waters. Here the
naturalist steps in, and enables him to fill up this great gap in
the past history of the earth.
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