Geologists estimate from the deposition of salt in the oceans,

and from the rates of denudation and sedimentation, that the
formation of the rock strata has consumed from 60,000,000 to
100,000,000 years
Geologists estimate from the deposition of salt in the oceans,
and from the rates of denudation and sedimentation, that the
formation of the rock strata has consumed from 60,000,000 to
100,000,000 years. If the Earth had substantially its present
form 80,000,000 years ago we are safe in saying that the period
of time represented in the building up of the Earth from a
small nucleus to its present dimensions has been vastly longer,
probably reckoned in the thousands of millions of years.