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the basis of your understanding of the following passage and related studied concepts:
Fossils are the remains of long-dead organisms that have escaped decay and have, after many years, become part of the Earth's crust. A fossil may be the preserved remains of the organism itself, the impression of it in the sediment, or marks made by it during its lifetime.
For fossilisation to occur, rapid burial of the organism is required. Fossils provide a record of the appearance and extinction of organisms, from species to whole taxonomic groups. Once this record is calibrated against a time scale (by using a broad range of dating techniques). It is possible to build up a picture of the evolutionary changes that have taken place.
Name the two methods used to estimate age of the fossils.

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