Pragian

Pragian
Pragian
410.8 ± 2.8 – 407.6 ± 2.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Chronology
	Subdivision of the Devonian according to the ICS, as of 2021.; Vertical axis scale: millions of years ago.

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.

EtymologyName formalityFormalName ratified1985^[5]Usage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionFAD of the conodonts Eognathodus sulcatus and Latericriodus steinachensis Morph betaLower boundary GSSPVelká Chuchle quarry, Prague, Czech Republic
50°00′53″N 14°22′21″E / 50.0147°N 14.3726°ELower GSSP ratified1989^[5]Upper boundary definitionFAD of the conodont Polygnathus kitabicusUpper boundary GSSPZinzil'ban Gorge, Uzbekistan
39°12′00″N 67°18′20″E / 39.2000°N 67.3056°EUpper GSSP ratified1995^[6]

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

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[8]

Pragian
410.8 ± 2.8 – 407.6 ± 2.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Chronology

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