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For example, in the rocks exposed in the walls of the Grand Canyon (Figure 1) there are many horizontal layers, which are called strata.
The study of strata is called stratigraphy, and using a few basic principles, it is possible to work out the relative ages of rocks.
There are three general approaches that allow scientists to date geological materials and answer the question: "How old is this fossil?
" First, the relative age of a fossil can be determined.
In the Grand Canyon, the layers of strata are nearly horizontal.
Most sediment is either laid down horizontally in bodies of water like the oceans, or on land on the margins of streams and rivers.
Danish Stone Age people had a diet rich in fish, so there is a great risk that errors have been made in the dating of an unknown number of settlements.
But this may method may well be fraught with errors.
There’s probably no need to rewrite the history books, but it’s likely that they contain some incorrectly dated excavation sites, Associate Professor Felix Riede told Aarhus University’s newsletter This is due to the fact that fish contain less of the radioactive substance Carbon 14 if they have lived in hard water.
Hard water contains high levels of calcium carbonate. However, depending on ocean water circulation, fish and other living creatures can incorporate 'older' carbonate (with less carbon-14) into their bodies.
By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.
However, the age of each fossil primate needs to be determined so that fossils of the same age found in different parts of the world and fossils of different ages can be compared.