Chibanian

Stage of the Pleistocene Epoch

Chibanian

0.7741 – 0.129 Ma

PreꞒ

The Chibanian Stratum, located at the Yoro River near Ichihara City, Japan

Chronology

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−1.8 --

−1.6 --

−1.4 --

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Cenozoic

Quaternary

Pleistocene

Piacenzian

Gelasian

Calabrian

Chibanian

"Late"

| | <-|

Holocene

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Subdivision of the Quaternary according to the ICS, as of 2023.[1]
Vertical axis scale: Millions of years ago

Etymology
Name formality| Formal
Name ratified| January 2020
Synonym(s)| Middle Pleistocene
Ionian

Usage information
Celestial body| Earth
Regional usage| Global (ICS)
Time scale(s) used| ICS Time Scale
Definition
Chronological unit| Age
Stratigraphic unit| Stage
Time span formality| Formal
Lower boundary definition| 1.1 m below the directional midpoint of the Brunhes-Matuyama magnetic reversal
Lower boundary GSSP| Chiba, Japan
35°17′39″N 140°08′47″E﻿ / ﻿35.2943°N 140.1465°E﻿ / 35.2943; 140.1465
Lower GSSP ratified| January 2020[2]
Upper boundary definition| Not formally defined
Upper boundary definition candidates| Marine Isotope Substage 5e
Upper boundary GSSP candidate section(s)| None
The Chibanian stratum, which dates back to the Chiba period, is located along the Yoro River in Ichihara City, Chiba Prefecture. At the bottom left is a golden spike that marks the boundary between eras. The color-coded stakes on the right mark the boundaries of geological formations, indicating that the Earth's magnetic field was reversing.

The Chibanian, more widely known as the Middle Pleistocene (its previous informal name), is an age in the international geologic timescale or a stage in chronostratigraphy, being a division of the Pleistocene Epoch within the ongoing Quaternary Period.[3] The Chibanian name was officially ratified in January 2020. It is currently estimated to span the time between 0.7741 Ma (774,100 years ago) and 0.129 Ma (129,000 years ago), also expressed as 774.1–129 ka.[1][4] It includes the transition in palaeoanthropology from the Lower to the Middle Paleolithic over 300 ka.

The Chibanian is preceded by the Calabrian and succeeded by the Late Pleistocene.[1] The beginning of the Chibanian is the Brunhes–Matuyama reversal, when the Earth's magnetic field last underwent reversal.[5] Its end roughly coincides with the termination of the Penultimate Glacial Period and the onset of the Last Interglacial period (corresponding to the beginning of Marine Isotope Stage 5).[6]

The term Middle Pleistocene was in use as a provisional or "quasi-formal" designation by the International Union of Geological Sciences (IUGS). While the three lowest ages of the Pleistocene, the Gelasian, Calabrian and Chibanian have been officially defined, the Late Pleistocene has yet to be formally defined.[7]

## Definition process

[edit]

The International Union of Geological Sciences (IUGS) had previously proposed replacement of the Middle Pleistocene by an Ionian Age based on strata found in Italy. In November 2017, however, the Chibanian (based on strata at a site in Chiba Prefecture, Japan) replaced the Ionian as the Subcommission on Quaternary Stratigraphy's preferred GSSP proposal for the age that should replace the Middle Pleistocene sub-epoch.[8] The "Chibanian" name was ratified by the IUGS in January 2020.[3]

## Climate

[edit]

By early Middle Pleistocene, the Mid-Pleistocene Transition had changed the glacial cycles from an average 41,000 year periodicity present during most of the Early Pleistocene to a 100,000 year periodicity,[9] with the glacial cycles becoming asymmetric, having long glacial periods punctuated by short warm interglacial periods.[10] Millennial-scale climatic variability continued to be highly sensitive to precession and obliquity cycles.[11]

In central Italy, the climate became noticeably more arid from 600 ka to 400 ka.[12]

The late Middle Pleistocene was a time of regional aridification in the Levant, with a shallow lake covering what is now the Shishan Marsh drying and developing into a marsh.[13]

Eastern Africa's hydroclimate was governed primarily by orbital precession, although modulated significantly by the 100 kyr eccentricity cycle.[14]

Along the northwestern Australian coast, the intensification of the Leeuwin Current resulted in an expansion of reefs coincident with the Great Barrier Reef's formation.[15]

## Events

[edit]

The Early-Middle Pleistocene boundary saw the migration of true horses out of North America and into Eurasia.[16] Also around this time, the European mammoth species Mammuthus meridionalis became extinct and was replaced by the Asian species Mammuthus trogontherii (the steppe mammoth). This was coincident with the migration of the elephant genus Palaeoloxodon out of Africa and into Eurasia, including the first appearance of species like the European straight-tusked elephant (Palaeoloxodon antiquus).[17] With the extinction of Sinomastodon in East Asia at the Early-Middle Pleistocene boundary, gomphotheres became completely extinct in Afro-Eurasia,[18][19] but continued to persist in the Americas into the Late Pleistocene.[19] There was a major extinction of carnivorous mammals in Europe around the Early-Middle Pleistocene transition, including the giant hyena Pachycrocuta.[20] The mid-late Middle Pleistocene saw the emergence of the woolly mammoth (Mammuthus primigenius), and its replacement of Mammuthus trogontherii, with the replacement of M. trogontherii in Europe by woolly mammoths being complete by around 200,000 years ago.[17][21] The last member of the notoungulate family Mesotheriidae, Mesotherium, has its last records around 220,000 years ago, leaving Toxodontidae as the sole family of notoungulates to persist into the Late Pleistocene.[22] During the late Middle Pleistocene, around 195,000-135,000 years ago, the steppe bison (the ancestor of the modern American bison) migrated across the Bering land bridge into North America, marking the beginning of the Rancholabrean faunal stage.[23] Around 500,000 years ago, the last members of the largely European aquatic frog genus Palaeobatrachus and by extension the family Palaeobatrachidae became extinct.[24]

## Palaeoanthropology

[edit]

The Chibanian includes the transition in palaeoanthropology from the Lower to the Middle Paleolithic: i.e., the emergence of Homo sapiens sapiens between 300 ka and 400 ka.[25] The oldest known human DNA dates to the Middle Pleistocene, around 430,000 years ago. This is the oldest found, as of 2016[update].[26]

After analyzing 2,496 remains of Castor fiber (Eurasian beaver) and Trogontherium cuvieri found at Bilzingsleben in Germany, a team of scientists concluded that, around 400 ka, hominids in the area hunted and exploited beavers. They may have been targeted for their meat (based on cut marks on the bones) and skin.[27]

## Chronology

[edit]

Further information: Timeline of glaciation

Further information: Marine isotope stages and Last Glacial Period

Further information: Brunhes–Matuyama reversal

Age  | paleoclimate  | glaciation  | palaeoanthropology

|
|
|

790–761 ka | MIS 19 | Günz (Elbe) glaciation | Peking Man (Homo erectus)
761–712 ka | MIS 18
712–676 ka | MIS 17
676–621 ka | MIS 16
621–563 ka | MIS 15 | Gunz-Haslach interglacial | Heidelberg Man (Homo heidelbergensis), Bodo cranium
563–524 ka | MIS 14
524–474 ka | MIS 13 | end of Cromerian (Günz-Mindel) interglacial | Boxgrove Man (Homo heidelbergensis)
474–424 ka | MIS 12 | Anglian Stage in Britain; Haslach glaciation | Tautavel Man (Homo erectus)
424–374 ka | MIS 11 | Hoxnian (Britain), Yarmouthian (North America) | Swanscombe Man (Homo heidelbergensis)
374–337 ka | MIS 10 | Mindel glaciation, Elster glaciation, Riss glaciation
337–300 ka | MIS 9 | Purfleet Interglacial in Britain | Mousterian
300–243 ka | MIS 8 |  | Irhoud 1 (Homo sapiens); Middle Paleolithic; Haplogroup A (Y-DNA)
243–191 ka | MIS 7 | Aveley Interglacial in Britain | Galilee Man; Haua Fteah
191–130 ka | MIS 6 | Illinoian Stage | Herto Man (Homo sapiens); Macro-haplogroup L (mtDNA); Mousterian
130-123 ka | MIS 5e | peak of Eemian interglacial sub-stage, or Ipswichian in Britain | Klasies River Caves; Sangoan

## See also

[edit]

* Mid-Pleistocene Transition
* 100,000-year problem
* Pleistocene megafauna

## References

[edit]

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23. ^ Froese, Duane; Stiller, Mathias; Heintzman, Peter D.; Reyes, Alberto V.; Zazula, Grant D.; Soares, André E. R.; Meyer, Matthias; Hall, Elizabeth; Jensen, Britta J. L.; Arnold, Lee J.; MacPhee, Ross D. E. (2017-03-28). "Fossil and genomic evidence constrains the timing of bison arrival in North America". Proceedings of the National Academy of Sciences. 114 (13): 3457–3462\. Bibcode:2017PNAS..114.3457F. doi:10.1073/pnas.1620754114. ISSN 0027-8424. PMC 5380047. PMID 28289222.3457-3462&rft.date=2017-03-28&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5380047#id-name=PMC&rft_id=info:bibcode/2017PNAS..114.3457F&rft_id=info:pmid/28289222&rft_id=info:doi/10.1073/pnas.1620754114&rft.issn=0027-8424&rft.aulast=Froese&rft.aufirst=Duane&rft.au=Stiller,+Mathias&rft.au=Heintzman,+Peter+D.&rft.au=Reyes,+Alberto+V.&rft.au=Zazula,+Grant+D.&rft.au=Soares,+André+E.+R.&rft.au=Meyer,+Matthias&rft.au=Hall,+Elizabeth&rft.au=Jensen,+Britta+J.+L.&rft.au=Arnold,+Lee+J.&rft.au=MacPhee,+Ross+D.+E.&rft_id=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5380047&rfr_id=info:sid/en.wikipedia.org:Chibanian" class="Z3988">
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Quaternary Period

| Pleistocene Epoch| Holocene Epoch

|

* Early
* Middle
* Late

* Meghalayan
* Northgrippian
* Greenlandian
* Preboreal
* Boreal
* Atlantic
* Subboreal
* Subatlantic

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Geological history of Earth

Cenozoic Era
(present–66.0 Ma)|

| Quaternary (present–2.58 Ma)|

* Holocene (present–11.7 ka)
* Pleistocene (11.7 ka–2.58 Ma)

|

Neogene (2.58–23.0 Ma)|

* Pliocene (2.59–5.33 Ma)
* Miocene (5.33–23.0 Ma)

Paleogene (23.0–66.0 Ma)|

* Oligocene (23.0–33.9 Ma)
* Eocene (33.9–56.0 Ma)
* Paleocene (56.0–66.0 Ma)

Mesozoic Era
(66.0–252 Ma)|

| Cretaceous (66.0–145 Ma)|

* Late (66.0–100 Ma)
* Early (100–145 Ma)

|

Jurassic (145–201 Ma)|

* Late (145–164 Ma)
* Middle (164–174 Ma)
* Early (174–201 Ma)

Triassic (201–252 Ma)|

* Late (201–237 Ma)
* Middle (237–247 Ma)
* Early (247–252 Ma)

Paleozoic Era
(252–539 Ma)|

| Permian (252–299 Ma)|

* Lopingian (252–260 Ma)
* Guadalupian (260–272 Ma)
* Cisuralian (272–299 Ma)

|

Carboniferous (299–359 Ma)|

* Pennsylvanian (299–323 Ma)
* Mississippian (323–359 Ma)

Devonian (359–419 Ma)|

* Late (359–383 Ma)
* Middle (383–393 Ma)
* Early (393–419 Ma)

Silurian (419–444 Ma)|

* Pridoli (419–423 Ma)
* Ludlow (423–427 Ma)
* Wenlock (427–433 Ma)
* Llandovery (433–444 Ma)

Ordovician (444–485 Ma)|

* Late (444–458 Ma)
* Middle (458–470 Ma)
* Early (470–485 Ma)

Cambrian (485–539 Ma)|

* Furongian (485–497 Ma)
* Miaolingian (497–509 Ma)
* Series 2 (509–521 Ma)
* Terreneuvian (521–539 Ma)

Proterozoic Eon
(539 Ma–2.5 Ga)|

| Neoproterozoic (539 Ma–1 Ga)|

* Ediacaran (539–635 Ma)
* Cryogenian (635–720 Ma)
* Tonian (720 Ma–1 Ga)

|

Mesoproterozoic (1–1.6 Ga)|

* Stenian (1–1.2 Ga)
* Ectasian (1.2–1.4 Ga)
* Calymmian (1.4–1.6 Ga)

Paleoproterozoic (1.6–2.5 Ga)|

* Statherian (1.6–1.8 Ga)
* Orosirian (1.8–2.05 Ga)
* Rhyacian (2.05–2.3 Ga)
* Siderian (2.3–2.5 Ga)

Archean Eon (2.5–4 Ga)|

* Neoarchean (2.5–2.8 Ga)
* Mesoarchean (2.8–3.2 Ga)
* Paleoarchean (3.2–3.6 Ga)
* Eoarchean (3.6–4 Ga)

Hadean Eon (4–4.6 Ga)|

ka = kiloannum (thousand years ago); Ma = megaannum (million years ago); Ga = gigaannum (billion years ago).
See also: Geologic time scale • Geology portal • World portal
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