#chronostratigraphy
- Aquitanian — The first geochronological stage or subdivision of the early Miocene epoch, situated at the base of the Neogene period, covering a time interval from around twenty million years ago; also, as an adjective, it describes geological elements from this stage or refers to the Aquitaine region in France and its historical inhabitants. This structural term marks a major transitional geological period, defined by global climatic shifts and significant tectonic movements.