Santonian

Source: Wikipedia, the free encyclopedia.
Santonian
86.3 ± 0.5 – 83.6 ± 0.2 Ma
↓
Chronology

The Santonian is an

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]

Stratigraphic definition

The Santonian Stage was established by French 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

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

forams
is more detailed.

References

Notes

  1. ^ International Commission on Stratigraphy. "ICS - Chart/Time Scale". www.stratigraphy.org.
  2. doi:10.18814/epiiugs/2014/v37i1/001
    . Retrieved 24 December 2020.
  3. ^
    S2CID 253436620
    . Retrieved 14 January 2023.
  4. S2CID 256539746
    . Retrieved 27 March 2023.
  5. ^ "Campanian GSSP Ratified by IUGS". Subcommission on Cretaceous Stratigraphy. International Commission on Stratigraphy. Retrieved 14 January 2023.
  6. ^ Gradstein et al. (2004)
  7. ^
    ISBN 978-0-12-824360-2
    .
  8. ISBN 978-0-12-824360-2
    .

Literature

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=Santonian&oldid=1193737665"