Radiometric dating seafloor
The youngest crust of the ocean floor can be found near the seafloor spreading centers, or mid-ocean ridges.
As the plates split apart, magma rises from below the Earth's surface to fill in the empty void.
By combining multiple geochronological (and biostratigraphic) indicators the precision of the recovered age can be improved.
Geochronology is different in application from biostratigraphy, which is the science of assigning sedimentary rocks to a known geological period via describing, cataloguing and comparing fossil floral and faunal assemblages.
This then can be used to deduce the sequence of events and processes that took place or the history of that brief period of time as recorded in the .
organisms, geologists employ a variety of techniques.
These include some that establish a relative chronology in which occurrences can be placed in the correct sequence relative to one another or to some known succession of events.
When an old, cold and dense oceanic plate comes into contact with a thick, buoyant continental crust or younger (and thus warmer and thicker) oceanic crust, it will always subduct.
In essence, oceanic plates are more susceptible to subduction as they get older.