Pragian

From Wikipedia
https://en.wikipedia.org/wiki/Pragian
Pragian
410.8 ± 2.8 – 407.6 ± 2.6 Ma
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Chronology
Etymology
Name formalityFormal
Name ratified1985 [5]
Usage information
Celestial body Earth
Regional usageGlobal ( ICS)
Time scale(s) usedICS Time Scale
Definition
Chronological unit Age
Stratigraphic unit Stage
Time span formalityFormal
Lower boundary definition FAD of the conodonts Eognathodus sulcatus and Latericriodus steinachensis Morph beta
Lower boundary GSSP Velká Chuchle quarry, Velká Chuchle, Prague, Czechia
50°00′53″N 14°22′21″E / 50.0147°N 14.3726°E / 50.0147; 14.3726
GSSP ratified1989 [5]
Upper boundary definitionFAD 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 ratified1995 [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 Praha Formation at Velká Chuchle, Prague.

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

Pragian geology

Pragian life

Ammonoidea

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]

Agnathans

Agnathans of the Pragian
Taxa Presence Location Description Images
Drepanaspis Lochkovian- Emsian Hunsrück Slate, Germany, among others in Europe
Drepanaspis Fossil.jpg
Errivaspis Lochkovian- Emsian Wayne Hereford Quarry, England & Babin Sandstone, Podolia, Ukraine
Pteraspis Lochkovian- Eifelian Eifelian Maecuru Formation, Brazil; Lochkovian Ditton Group, Britain; Lochkovian Ivane Suite and Pragian Babin Sandstone, Ukraine
Estonian Museum of Natural History - Pteraspis.png

Sarcopterygii

Lobe finned fish of the Pragian
Taxa Presence Location Description Images
Tungsenia ~409 mya Posongchong Formation, Yunnan, China It is possibly the basalmost known tetrapodomorph

Arthropods

Arthropods of the Pragian
Taxa Presence Location Description Images
Jaekelopterus Pragian-early Emsian Klerf Formation, Rhineland, Germany
Wyoming[ citation needed]
Jaekelopterus rhenaniae reconstruction.jpg

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.
  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. Bibcode: 2004JG....112..495K. doi: 10.1086/421077.
  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". www.stratigraphy.org. International Commission on Stratigraphy.
  5. ^ a b Chlupac, Ivo; Oliver, William (June 1989). "Decision on the Lochkovian-Pragian Boundary Stratotype (Lower Devonian)" (PDF). Episodes. 12 (2): 109–114. doi: 10.18814/epiiugs/1989/v12i2/014. 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. Retrieved 18 December 2020.
  7. ^ "Pragian stage". Encyclopedia Britannica. Retrieved 2 October 2019.
  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.