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18 May

On the other hand, the sedimentary rock (as I know) usually provide the time of formation by age range of fossil e.g. Is there any method to make it more specific like the crystalline one?

In regions outside the tropics, trees grow more quickly during the warm summer months than during the cooler winter.

Absolute dating is necessary for knowing specific time e.g.

by isotope K/Ar in mica, especially in the crystalline rock: igneous and metamorphic rock.

The width of a series of growth rings can give clues to past climates and various disruptions such as forest fires.

Droughts and other variations in the climate make the tree grow slower or faster than normal, which shows up in the widths of the tree rings.

Following death, however, no new carbon is consumed.

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This interactive asks you to choose the best absolute dating method for each layer of rock in a cliff.

These tree ring variations will appear in all trees growing in a certain region, so scientists can match up the growth rings of living and dead trees.

Using logs recovered from old buildings and ancient ruins, scientists have been able to compare tree rings to create a continuous record of tree rings over the past 2,000 years.

decay or the rate of other cumulative changes in atoms resulting from radioactivity. The various isotopes of the same element differ in terms of atomic mass but have the same atomic number..

One half-life is the amount of time required for of the original atoms in a sample to decay.