Geoscience Reference
In-Depth Information
Figure 13.6 Holmes' 1947
geological timescale. The
figures in the boxes refer to the
duration of the geological
periods in millions of years;
those outside refer to cumu-
lative ages before the present.
Holmes preferred Scale B (from
Arthur Holmes, Transactions
of the Geological Society of
Glasgow 31, part 1 (1947),
p. 145). (Geological Museum,
Trinity College Dublin.)
