Floian

Short description: Second and last age of the Early Ordovician epoch

Floian

477.7 ± 1.4 – 470.0 ± 1.4 Ma

PreЄ

Chronology

Template:Ordovician graphical timeline

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 Graptolite Tetragraptus approximatus
Lower boundary GSSP| Diabasbrottet quarry, Västergötland, Sweden
[ ⚑ ] 58°21′32″N 12°30′09″E﻿ / ﻿58.3589°N 12.5024°E﻿ / 58.3589; 12.5024
GSSP ratified| 2002[1]
Upper boundary definition| FAD of the Conodont Baltoniodus triangularis
Upper boundary GSSP| Huanghuachang section, Huanghuachang, Yichang, China
[ ⚑ ] 30°51′38″N 111°22′26″E﻿ / ﻿30.8605°N 111.3740°E﻿ / 30.8605; 111.3740
GSSP ratified| 2007[2]

The Floian is the second stage of the Ordovician Period. It succeeds the Tremadocian with which it forms the Lower Ordovician epoch. It precedes the Dapingian Stage of the Middle Ordovician. The Floian extended from 477.7 to 470 million years ago. The lower boundary is defined as the first appearance of the graptolite species Tetragraptus approximatus.[3]

## Naming and history

The Floian Stage is named after Flo, a village in Västergötland, southern Sweden. The name "Floan" was proposed in 2004, but the International Commission on Stratigraphy adapted Floian as the official name of the stage.[4]

## GSSP

The GSSP of the Floian is the Diabasbrottet Quarry ( [ ⚑ ] 58°21′32″N 12°30′09″E﻿ / ﻿58.3589°N 12.5024°E﻿ / 58.3589; 12.5024) which is an outcrop of a shale-dominated stratigraphic succession. The lower boundary of the Floian is defined as the first appearance of Tetragraptus approximatus which is above the base of the Tøyen Shale.[4] Radiometric dating has set the Tremadocian-Floian boundary at 477.7 million years ago.[3]

## References

1. ↑ Bergström, M.; Löfgren, Anita; Maletz, Jörg (December 2004). "The GSSP of the Second (Upper) Stage of the Lower Ordovician Series: Diabasbrottet at Hunneberg, Province of Västergötland, Southwestern Sweden". Episodes 27 (4): 265-272. https://www.researchgate.net/publication/279891211_The_GSSP_of_the_second_Upper_stage_of_the_Lower_Ordovician_series_Diabasbrottet_at_Hunneberg_province_of_Vastergotland_southwestern_Sweden. Retrieved 13 December 2020.
2. ↑ Chen, Xu; Bergström, Stig; Zhang, Yuan-Dong; Fan, Jun-Xuan (2009). "The base of the Middle Ordovician in China with special reference to the succession at Hengtang near Jiangshan, Zhejiang Province, southern China". Lethaia 42: 218-231. doi:10.1111/j.1502-3931.2008.00148.x. https://stratigraphy.org/gssps/files/dapingian2.pdf. Retrieved 13 December 2020.
3. ↑ 3.0 3.1 "GSSP Table - Paleozoic Era". Geologic TimeScale Foundation. https://engineering.purdue.edu/Stratigraphy/gssp/index.php?parentid=77.
4. ↑ 4.0 4.1 Bergström, Stig M.; Anita Löfgren; Jörg Maletz (2004). "The GSSP of the Second (Upper) Stage of the Lower Ordovician Series: Diabasbrottet at Hunneberg, Province of Västergötland, Southwestern Sweden". Episodes 27 (4): 265–272. http://www.stratigraphy.org/GSSP/file41.pdf. Retrieved 20 September 2012.

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

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