Chapter XII

GEOLOGICAL CHRONOLOGY--PRINCIPLES OF THE SYSTEM EXPLAINED
AND DEVELOPED.

Significance of Fossil Remains--Science of Palæontology--Classification
of existing Animal Life--Fossil Remains are found to
fit in with this Classification--Succession of Organic Life--Time
in Geology not measured by Years and Centuries--Successive
Periods marked by Successive Forms of Life--The Geologist
aims at arranging these Periods in Chronological Order--Position
of the various Groups of Strata not sufficient for this purpose--It
is accomplished chiefly through the aid of Fossil
Remains--Mode of proceeding practically explained--Chronological
Table, 198