Tortonian

Short description: Geologic age of the late Miocene

Tortonian

11.63 – 7.246 Ma

PreЄ

Chronology

Template:Neogene graphical timeline

Formerly part of| Tertiary Period/System
Etymology
Name formality| Formal
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| LAD of the Haptophyte Discoaster kugleri
Lower boundary GSSP| Monte dei Corvi Beach section, Ancona, Italy
[ ⚑ ] 43°35′12″N 13°34′10″E﻿ / ﻿43.5867°N 13.5694°E﻿ / 43.5867; 13.5694
GSSP ratified| 2003[1]
Upper boundary definition|

* First regular occurrence of the Planktonic Foraminifer Globorotalia miotumida
* FAD of the Haptophyte Amaurolithus delicatus

Upper boundary GSSP| Oued Akrech section, Rabat, Morocco
[ ⚑ ] 33°56′13″N 6°48′45″W﻿ / ﻿33.9369°N 6.8125°W﻿ / 33.9369; -6.8125
GSSP ratified| January 2000[2]

The Tortonian is in the geologic time scale an age or stage of the late Miocene that spans the time between 11.608 ± 0.005 Ma and 7.246 ± 0.005 Ma (million years ago). It follows the Serravallian and is followed by the Messinian.

The Tortonian roughly overlaps with the regional Pannonian Stage of the Paratethys timescale of Central Europe. It also overlaps the upper Astaracian, Vallesian and lower Turolian European land mammal ages, the upper Clarendonian and lower Hemphillian North American land mammal ages and the upper Chasicoan and lower Huayquerian South American land mammal ages.

## Contents

* 1 Definition
* 2 Geologic history
* 3 References
* 3.1 Notes
* 3.2 Literature
* 4 External links

## Definition

The Tortonian was introduced by Swiss stratigrapher Karl Mayer-Eymar in 1858. It was named after the Italian city of Tortona in the region Piedmont.

The base of the Tortonian Stage is at the last common appearance of calcareous nanoplankton Discoaster kugleri and planktonic foram Globigerinoides subquadratus. It is also associated with the short normal polarized magnetic chronozone C5r.2n. A GSSP for the Tortonian has been established in the Monte dei Corvi section near Ancona (Italy).[3]

The top of the Tortonian (the base of the Messinian) is at the first appearance of the planktonic foram species Globorotalia conomiozea and is stratigraphically in the middle of magnetic chronozone C3Br.1r.

## Geologic history

In 2020, geologists reported two newly-identified supervolcano eruptions associated with the Yellowstone hotspot track, including the region's largest and most cataclysmic event - the Grey's Landing super-eruption - which had a volume of at least 2,800 km3 and occurred around 8.72 Ma.[4][5]

## References

### Notes

1. ↑ Hilgen, F. J.; Hayfaa Abdul Aziz; Bice, David; Iaccarino, Silvia; Krijgsman, Wout; Kuiper, Klaudia; Montanari, Alessandro; Raffi, Isabella et al. (2005). "The Global boundary Stratotype Section and Point (GSSP) of the Tortonian Stage (Upper Miocene) at Monte Dei Corvi". Episodes 28 (1): 6–17. doi:10.18814/epiiugs/2005/v28i1/001. https://stratigraphy.org/gssps/files/tortonian.pdf. Retrieved 26 December 2020.
2. ↑ Hilgen, F. J.; S. Iaccarino; W. Krijgsman; G. Villa; C. G. Langereis; W. J. Zachariasse (2000). "The Global Boundary Stratotype Section and Point (GSSP) of the Messinian Stage (uppermost Miocene)". Episodes 23 (3): 172–178. doi:10.18814/epiiugs/2000/v23i3/004. http://www.stratigraphy.org/GSSP/file6.pdf.
3. ↑ By Hilgen et al. (2005)
4. ↑ Knott, T.R.; Branney, M.J.; Reichow, M.K.; Finn, D.R.; Tapster, S.; Coe, R.S. (2020). "Discovery of two new super-eruptions from the Yellowstone hotspot track (USA): Is the Yellowstone hotspot waning?". Geology 48 (9): 934–938. doi:10.1130/G47384.1. Bibcode: 2020Geo....48..934K.
5. ↑ "Discovery of Ancient Super-Eruptions Indicates the Yellowstone Hotspot May Be Waning". The Geological Society of America. 3 June 2020. https://www.geosociety.org/GSA/News/pr/2020/20-18.aspx.

### Literature

* Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press.
* Hilgen, F.; Abdul Aziz, H.; Bice, D.; Iaccarino, S.; Krijgsman, W.; Kuiper, K.; Montanari, A.; Raffi, I.; Turco, E. & Zachariasse, W.-J.; 2005: The Global boundary Stratotype Section and Point (GSSP) of the Tortonian Stage (Upper Miocene) at Monte Dei Corvi, Episodes 28, p. 6-17.
* Mayer-Eymar, K.; 1858: Versuch einer neuen Klassifikation der Tertiär-Gebilde Europa’s, Verhandlungen der Schweizerischen Naturforschenden Gesellschaft, Jahresversammlung 1857, p. 70–71 & 165–199. (in German)

## External links

* GeoWhen Database - Tortonian
* Neogene timescale, at the website of the subcommission for stratigraphic information of the ICS
* Neogene timescale at the website of the Norwegian network of offshore records of geology and stratigraphy

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Geological history of Earth

Cenozoic era
(present–66.0 Mya)|

| Quaternary (present–2.588 Mya)|

* Holocene (present–11.784 kya)
* Pleistocene (11.784 kya–2.588 Mya)

|

Neogene (2.588–23.03 Mya)|

* Pliocene (2.588–5.333 Mya)
* Miocene (5.333–23.03 Mya)

Paleogene (23.03–66.0 Mya)|

* Oligocene (23.03–33.9 Mya)
* Eocene (33.9–56.0 Mya)
* Paleocene (56.0–66.0 Mya)

Mesozoic era
(66.0–251.902 Mya)|

| Cretaceous (66.0–145.0 Mya)|

* Late (66.0–100.5 Mya)
* Early (100.5–145.0 Mya)

|

Jurassic (145.0–201.3 Mya)|

* Late (145.0–163.5 Mya)
* Middle (163.5–174.1 Mya)
* Early (174.1–201.3 Mya)

Triassic (201.3–251.902 Mya)|

* Late (201.3–237 Mya)
* Middle (237–247.2 Mya)
* Early (247.2–251.902 Mya)

Paleozoic era
(251.902–541.0 Mya)|

| Permian (251.902–298.9 Mya)|

* Lopingian (251.902–259.8 Mya)
* Guadalupian (259.8–272.3 Mya)
* Cisuralian (272.3–298.9 Mya)

|

Carboniferous (298.9–358.9 Mya)|

* Pennsylvanian (298.9–323.2 Mya)
* Mississippian (323.2–358.9 Mya)

Devonian (358.9–419.2 Mya)|

* Late (358.9–382.7 Mya)
* Middle (382.7–393.3 Mya)
* Early (393.3–419.2 Mya)

Silurian (419.2–443.8 Mya)|

* Pridoli (419.2–423.0 Mya)
* Ludlow (423.0–427.4 Mya)
* Wenlock (427.4–433.4 Mya)
* Llandovery (433.4–443.8 Mya)

Ordovician (443.8–485.4 Mya)|

* Late (443.8–458.4 Mya)
* Middle (458.4–470.0 Mya)
* Early (470.0–485.4 Mya)

Cambrian (485.4–541.0 Mya)|

* Furongian (485.4–497 Mya)
* Miaolingian (497–509 Mya)
* Series 2 (509–521 Mya)
* Terreneuvian (521–541.0 Mya)

Proterozoic eon
(541.0 Mya–2.5 Gya)|

| Neoproterozoic (541.0 Mya–1 Gya)|

* Ediacaran (541.0–~635 Mya)
* Cryogenian (~635–~720 Mya)
* Tonian (~720 Mya–1 Gya)

|

Mesoproterozoic (1–1.6 Gya)|

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

Paleoproterozoic (1.6–2.5 Gya)|

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

Archean eon (2.5–4 Gya)|

| Eras|

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

|

Hadean eon (4–4.6 Gya)|

|  |

|

kya = thousands years ago. Mya = millions years ago. Gya = billions years ago.
See also: Geologic time scale

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