Absolute dating sedimentary rocks
He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.
The table omits the time before 2500 million years ago, which is not divided into periods.
Many Christians have been led to distrust radiometric dating and are completely unaware of the great number of laboratory measurements that have shown these methods to be consistent.
Many are also unaware that Bible-believing Christians are among those actively involved in radiometric dating.
Eons and eras are larger subdivisions than periods while periods themselves may be divided into epochs and ages.
The rocks formed during a period belong to a stratigraphic unit called a system.