Ajupiirkond
Ajupiirkond is a term used in Estonian to describe a span of time defined by particular characteristics, events, or conditions that distinguish it from adjacent intervals. In scholarly use, ajupiirkond helps organize knowledge across disciplines such as history, archaeology, geology, linguistics, and climatology.
Unlike fixed calendrical units, an ajupiirkond is not tied to a single set of dates. Its start
Delimitation relies on multiple lines of evidence, including artifacts, settlement patterns, dating results, stratigraphy, textual sources,
In use, ajupiirkond can describe broad eras or narrower intervals marked by cultural, technological, environmental, or