Paleomagnetic dating technique

Marker horizons are stratigraphic units of the same age and of such distinctive composition and appearance, that despite their presence in different geographic sites, there is certainty about their age-equivalence.

Fossil faunal and floral assemblages, both marine and terrestrial, make for distinctive marker horizons.

A number of radioactive isotopes are used for this purpose, and depending on the rate of decay, are used for dating different geological periods.

More slowly decaying isotopes are useful for longer periods of time, but less accurate in absolute years.

Geochronology: From largest to smallest: In the same way, it is entirely possible to go and visit an Upper Cretaceous Series deposit – such as the Hell Creek deposit where the Tyrannosaurus fossils were found – but it is naturally impossible to visit the Late Cretaceous Epoch as that is a period of time.

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Magnetostratigraphy determines age from the pattern of magnetic polarity zones in a series of bedded sedimentary and/or volcanic rocks by comparison to the magnetic polarity timescale.Exposure dating uses the concentration of exotic nuclides (e.g.Cl) produced by cosmic rays interacting with Earth materials as a proxy for the age at which a surface, such as an alluvial fan, was created.A sequence of paleomagnetic poles (usually called virtual geomagnetic poles), which are already well defined in age, constitutes an apparent polar wander path (APWP).Such a path is constructed for a large continental block.

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