Post quem dating
For example, consider an archaeological find of a burial that contains coins dating to 1588, 1595, and others less securely dated to 1590–1625. CATEGORY: chronology DEFINITION: Latin phrase meaning 'the end before which' -- the date before which a stratum, feature, or artifact must have been deposited.The term is used either to define a relative chronological date for artifacts or provide fixed points in a site's stratigraphy.When a number of objects are recovered from one deposit, the terminus post quem is determined by the youngest object: all the other finds, even though they are older, were put there at the same time, so the deposit must be younger than the youngest object.
The opposite of a terminus post quem is a terminus ante quem, where a deposit must have been laid before a certain date. However, the eruption of Pompeii in AD79 formed a terminus ante quem for the city: everything under the lava must have been there before AD79.
In the Great Yarmouth Archaeological Map, all finds are termini post quem.
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