Answer:
The Middle Pleistocene humans are morphologically diverse and broadly dispersed throughout time and space.
Step-by-step explanation:
The Middle Pleistocene is a subdivision of Pleistocene Epoch from 7,81000 to 1,26,000 years ago.It is preceded by the Calabrian stage, beginning with the Brunhes–Matuyama reversal, and succeeded by the Tarantian stage (equivalent to the Late or Upper Pleistocene), taken as beginning with the last interglacial (MIS 5).The tripartite subdivision of the Pleistocene into Lower (Early), Middle and Upper (Late) has been in use since the 1930s.[5] It is in use as a provisional or "quasi-formal" designation by the International Union of Geological Sciences (IUGS) as of 2018,[4] pending the ratification of the 2017 proposal by the International Commission on Stratigraphy (Subcommission on Quaternary Stratigraphy, ICSSQS) of the Chibanian stage.
Ionian :
The Ionian stage includes all of the European Sicilian Stage and the first part of the Tyrrhenian Stage. Suitable sections for defining the base of the Ionian Stage are located in southern Italy. During Lower and Middle Pleistocene the Adriatic-Ionian margin was characterized by high sedimentation rates, in response to intense differential tectonic subsidence and massive sedimentary yield. Specifically, candidate sections are the “Montalbano Jonico” Section (Bradanic Trough, Basilicata Region) and the “Valle di Manche Nord” Section (San Mauro Marchesato, Crotone Basin, Calabria Region). In the former, a spectacular succession of marls laid in the Apennine foredeep is exposed which, however, are unfortunately unsuitable for magnetostratigraphic analyses. The latter, which is represented by a shallowing-upward succession that developed in an outer-shelf environment, has the bonus of a sharp biomagnetostratigraphic record, which provides tighter age control.
Chibanian:
In November 2017, the Chibanian (defined at a site in Chiba Prefecture, Japan) replaced the Ionian as the Subcommission on Quaternary Stratigraphy's preferred GSSP proposal for the age/stage that should replace the Middle Pleistocene subepoch/subseries.[8] Until the Chibanian is ratified by the IUGS, the Chibanian will remain an unofficial informal, proposed stratigraphic division and Middle Pleistocene remains the provisional or quasi-formal name used by the IUGS, for example on its International Chronostratigraphic Chart for 2018.[4]