GEOLOGICAL TIME.—METHOD OF MEASURING THE RATE OF SUBAËRIAL
DENUDATION.
Rate of Subaërial Denudation a Measure of Time.—Rate determined
from Sediment of the Mississippi.—Amount of Sediment carried
down by the Mississippi; by the Ganges.—Professor Geikie on
Modern Denudation.—Professor Geikie on the Amount of Sediment
conveyed by European Rivers.—Rate at which the Surface of
the Globe is being denuded.—Alfred Tylor on the Sediment
of the Mississippi.—The Law which determines the Rate of
Denudation.—The Globe becoming less oblate.—Carrying Power
of our River Systems the true Measure of Denudation.—Marine
Denudation, trifling in comparison to Subaërial.—Previous
Methods of measuring Geological Time.—Circumstances which
show the recent Date of the Glacial Epoch.—Professor Ramsay
on Geological Time 329