Pragian

Short description: Second stage of the Devonian

Pragian

410.8 ± 2.8 – 407.6 ± 2.6 Ma

PreЄ

Chronology

Devonian Graphical Timeline

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Přídolí

Lochkovian

Pragian

Emsian

Eifelian

Givetian

Frasnian

Famennian

Tournai.

Rhynie chert[1]

Hangenberg event

Kellwasser event(s)[2]

Widespread[3]
shrubs & trees

S. America
glaciation begins

Hunsrück fauna

Subdivision of the Devonian according to the ICS, as of 2021.[4]
Vertical axis scale: millions of years ago.

Etymology
Name formality| Formal
Name ratified| 1985[5]
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 conodonts Eognathodus sulcatus and Latericriodus steinachensis Morph beta
Lower boundary GSSP| Velká Chuchle quarry, Prague, Czech Republic
[ ⚑ ] 50°00′53″N 14°22′21″E﻿ / ﻿50.0147°N 14.3726°E﻿ / 50.0147; 14.3726
GSSP ratified| 1989[5]
Upper boundary definition| FAD of the conodont Polygnathus kitabicus
Upper boundary GSSP| Zinzil'ban Gorge, Uzbekistan
[ ⚑ ] 39°12′00″N 67°18′20″E﻿ / ﻿39.2000°N 67.3056°E﻿ / 39.2000; 67.3056
GSSP ratified| 1995[6]

The Pragian is one of three faunal stages in the Early Devonian Epoch. It lasted from 410.8 ± 2.8 million years ago to 407.6 ± 2.8 million years ago. It was preceded by the Lochkovian Stage and followed by the Emsian Stage. The most important Lagerstätte of the Pragian is Rhynie chert in Scotland. It is named after the city of Prague.[7] The GSSP is located within the Prague Formation at Velká Chuchle, Prague.

In North America the Pragian Stage is represented by Siegenian or Deerparkian time.

## Pragian life

The first ammonoids (order Agoniatitida) appeared in later parts of this stage (at the lower boundary of the Zlichovian stage as it was known in Siberian representations). They were descended from bactritoid nautiloid ancestors, which also appeared in this stage before experiencing evolutionary radiations in the next stage.[8]

## References

1. ↑ Parry, S. F.; Noble, S. R.; Crowley, Q. G.; Wellman, C. H. (2011). "A high-precision U–Pb age constraint on the Rhynie Chert Konservat-Lagerstätte: time scale and other implications". Journal of the Geological Society (London: Geological Society) 168 (4): 863–872. doi:10.1144/0016-76492010-043. http://jgs.lyellcollection.org/content/168/4/863.abstract.
2. ↑ Kaufmann, B.; Trapp, E.; Mezger, K. (2004). "The numerical age of the Upper Frasnian (Upper Devonian) Kellwasser horizons: A new U-Pb zircon date from Steinbruch Schmidt(Kellerwald, Germany)". The Journal of Geology 112 (4): 495–501. doi:10.1086/421077. Bibcode: 2004JG....112..495K.
3. ↑ Algeo, T. J. (1998). "Terrestrial-marine teleconnections in the Devonian: links between the evolution of land plants, weathering processes, and marine anoxic events". Philosophical Transactions of the Royal Society B: Biological Sciences 353 (1365): 113–130. doi:10.1098/rstb.1998.0195.
4. ↑ "Chart/Time Scale". International Commission on Stratigraphy. http://www.stratigraphy.org/index.php/ics-chart-timescale.
5. ↑ 5.0 5.1 Chlupac, Ivo; Oliver, William (June 1989). "Decision on the Lochkovian-Pragian Boundary Stratotype (Lower Devonian)". Episodes 12 (2): 109–114. doi:10.18814/epiiugs/1989/v12i2/014. https://stratigraphy.org/gssps/files/pragian.pdf. Retrieved 18 December 2020.
6. ↑ Yolkin, E.; Kim, A.; Weddige, K.; Talent, J.; House, M. (December 1997). "Definition of the Pragian/Emsian Stage boundary". Episodes 20 (4): 235–240. doi:10.18814/epiiugs/1997/v20i4/005. https://www.researchgate.net/publication/281579958. Retrieved 18 December 2020.
7. ↑ "Pragian stage". https://www.britannica.com/place/Pragian-Stage.
8. ↑ Kröger, Björn (2009). "Nautiloids before and during the origin of ammonoids in a Siluro-Devonian section in the Tafilalt, Anti-Atlas, Morocco". Special Papers in Palaeontology 79. ISBN 978-1-405-18770-1. https://www.researchgate.net/publication/286593281.

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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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