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These tests have consistently given the same ages for each of these objects.
Examples of a number of consistent dates derived from different methods are given.
However, human beings love to see factual precision, and we want to know how old something is.
James Hutton and William Smith advanced the concept of geologic time and strengthened the belief in an ancient world.
The most compelling argument for an age of the earth of 4.5 billion years are the large number of independent tests that have been used to confirm this date.
These tests have been performed on what are thought to be the earth's oldest surviving rocks, meteorites, and moon rocks.
Using these key or index fossils as markers, Smith could identify a particular layer of rock wherever it was exposed.
Because fossils actually record the slow but progressive development of life, scientists use them to identify rocks of the same age throughout the world.
Cross-dating is a technique used to take advantage of consistencies in stratigraphy between parts of a site or different sites, and objects or strata with a known relative chronology.