Santonian

Short description: Fourth age of the Late Cretaceous epoch

Santonian

86.3 ± 0.5 – 83.6 ± 0.2 Ma

PreЄ

Chronology

Cretaceous graphical timeline

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Tithonian

Berriasian

Valanginian

Hauterivian

Barremian

Aptian

Albian

Cenoman.

Turonian

Coniacian

Santonian

Campanian

Maastricht.

90%;>Danian

K-Pg mass
extinction

Subdivision of the Cretaceous according to the ICS, as of 2021.[1]
Vertical axis scale: millions of years ago.

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| FAD of the Inoceramid Bivalve Cladoceramus undulatoplicatus
Lower boundary GSSP| Olazagutia, Spain
[ ⚑ ] 42°52′00″N 2°11′48″W﻿ / ﻿42.8668°N 2.1968°W﻿ / 42.8668; -2.1968
GSSP ratified| January 2013[2]
Upper boundary definition| Base of Chron C33r[3]
Upper boundary GSSP| Bottaccione, Gubbio, Italy[3]
[ ⚑ ] 43°21′46″N 12°34′58″E﻿ / ﻿43.3627°N 12.5828°E﻿ / 43.3627; 12.5828[4]
GSSP ratified| October 2022[5]

The Santonian is an age in the geologic timescale or a chronostratigraphic stage. It is a subdivision of the Late Cretaceous Epoch or Upper Cretaceous Series. It spans the time between 86.3 ± 0.7 mya (million years ago) and 83.6 ± 0.7 mya. The Santonian is preceded by the Coniacian and is followed by the Campanian.[6]

## Contents

* 1 Stratigraphic definition
* 1.1 Subdivision
* 2 References
* 2.1 Notes
* 2.2 Literature
* 3 External links

## Stratigraphic definition

The Santonian Stage was established by France geologist Henri Coquand in 1857. It is named after the city of Saintes in the region of Saintonge, where the original type locality is located.[7]

The base of the Santonian Stage is defined by the appearance of the inoceramid bivalve Cladoceramus undulatoplicatus. The GSSP (official reference profile) for the base of the Santonian Stage is located near Olazagutia, Spain; it was ratified by the Subcommission on Cretaceous Stratigraphy in 2012.[7] The Santonian's top (the base of the Campanian Stage) is informally marked by the extinction of the crinoid Marsupites testudinarius.[8] A GSSP for the top of the Santonian was ratified in October 2022 in Bottaccione, Gubbio, Italy.[3]

### Subdivision

The Santonian is sometimes subdivided into Lower, Middle and Upper Substages. In the Tethys domain the Santonian is coeval with a single ammonite biozone: that of Placenticeras polyopsis. Biostratigraphy based on inoceramids, nanoplankton or forams is more detailed.

## References

### Notes

1. ↑ Super User. "ICS - Chart/Time Scale". http://www.stratigraphy.org/index.php/ics-chart-timescale.
2. ↑ Lamolda, M.; Paul, C.; Peryt, D.; Pons, J. (March 2014). "The Global Boundary Stratotype and Section Point (GSSP) for the base of the Santonian Stage, "Cantera de Margas", Olazagutia, northern Spain". Episodes 37 (1): 2–13. doi:10.18814/epiiugs/2014/v37i1/001. https://www.researchgate.net/publication/263378103. Retrieved 24 December 2020.
3. ↑ 3.0 3.1 3.2 Jarvis, Ian (2023). "Carbon isotopes, palynology and stratigraphy of the Santonian–Campanian boundary: The GSSP auxiliary sections, Seaford Head (England) and Bocieniec (Poland), and correlation between the Boreal and Tethyan realms". Cretaceous Research 143: 105415. doi:10.1016/j.cretres.2022.105415. Bibcode: 2023CrRes.14305415J. https://www.sciencedirect.com/science/article/pii/S0195667122002798. Retrieved 14 January 2023.
4. ↑ Gale, Andy; Batenburg, Sietske; Coccioni, Rodolfo; Dubicka, Zofia; Erba, Elisabetta; Falzoni, Francesca; Haggart, Jim; Hasegawa, Takishi et al. (1 February 2023). "The Global Boundary Stratotype Section and Point (GSSP) of the Campanian Stage at Bottaccione (Gubbio, Italy) and its Auxiliary Sections: Seaford Head (UK), Bocieniec (Poland), Postalm (Austria), Smoky Hill, Kansas (U.S.A), Tepayac (Mexico)". Episodes: 6. doi:10.18814/epiiugs/2022/022048. https://www.episodes.org/journal/view.html?uid=2319&vmd=Full. Retrieved 27 March 2023.
5. ↑ "Campanian GSSP Ratified by IUGS". International Commission on Stratigraphy. https://cretaceous.stratigraphy.org/news/campanian_gssp.
6. ↑ Gradstein et al. (2004)
7. ↑ 7.0 7.1 Gradstein, F.M.; Ogg, J.G.; Schmitz, M.D. et al., eds (2020). Geologic Time Scale 2020. Elsevier. p. 1038. ISBN 978-0-12-824360-2.
8. ↑ Gradstein, F.M.; Ogg, J.G.; Schmitz, M.D. et al., eds (2020). Geologic Time Scale 2020. Elsevier. p. 1040. ISBN 978-0-12-824360-2.

### Literature

* Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press .

## External links

* GeoWhen Database - Santonian
* Late Cretaceous timescale, at the website of the subcommission for stratigraphic information of the ICS
* Stratigraphic chart of the Late Cretaceous, at the website of Norges 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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