centromeerid
Centromeerid is a proposed but not officially recognized geological period, often discussed in relation to the Phanerozoic Eon. The concept of a centromeerid period typically arises in discussions about potential subdivisions of geological time that fall between the Paleozoic and Mesozoic eras. It is not a formal unit within the Geologic Time Scale as established by the International Commission on Stratigraphy.
The idea of a centromeerid period is largely hypothetical, serving as a conceptual space for geological events
Currently, the geological time scale officially recognizes the Permian Period as the final period of the Paleozoic