Geological Time Scale

Revisions to the relative time scale have occurred since the late 1700s.A geologic time scale, 1989 edition.A Cretaceous time scale.ISBN 0-521-38765-5 [One of the more recent compilations of the entire geologic time scale.].[One of the earlier attempts at an integrated geochronologic time scale.].Few discussions in geology can occur without reference to geologic time.Absolute time (chronometric) -- numerical ages in millions of years or some other measurement.ISBN 0-86542-069-6 [Chapter 4 provides an introduction to geologic time.Geological Association of Canada, Special Paper 39, p.379-396.Geologic time is often dicussed in two forms.