Lochkovian

Lochkovian
Lochkovian
419.2 ± 3.2 – 410.8 ± 2.8 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Chronology
←	Hangenberg event,; Famennian glaciation
←	Kellwasser event (Late Devonian extinction)
←	Widespread; shrubs & trees
←	Hunsrück fauna;
←	Rhynie chert
	Subdivision of the Devonian according to the ICS, as of 2023.; Vertical axis scale: Millions of years ago;
Etymology
Name formality	Formal
Name ratified	1985
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 Monograptus uniformis
Lower boundary GSSP	Klonk, Prague, Czech Republic; 49°51′18″N 13°47′31″E / 49.8550°N 13.7920°E
Lower GSSP ratified	1972
Upper boundary definition	FAD of the conodonts Eognathodus sulcatus and Latericriodus steinachensis Morph beta
Upper boundary GSSP	Velká Chuchle quarry, Velká Chuchle, Prague, Czech Republic; 50°00′53″N 14°22′21″E / 50.0147°N 14.3726°E
Upper GSSP ratified	1989

The Lochkovian is one of three faunal stages in the Early Devonian Epoch. It lasted from 419.2 ± 3.2 million years ago to 410.8 ± 2.8 million years ago. It marked the beginning of the Devonian Period, and was followed by the Pragian Stage. It is named after the village of Lochkov in the Czech Republic, now part of the city of Prague.^[7] The GSSP is located within the Lochkow Formation at the Klonk Section in Prague.

In North America the Lochkovian Stage is represented by Gedinnian or Helderbergian time.

References

^ 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.
^ 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.
^ 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. 168 (4). London: Geological Society: 863–872. doi:10.1144/0016-76492010-043.
^ "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. September 2023. Retrieved November 10, 2024.
^ ^a ^b Chlupac, Ivo; Oliver, William (June 1989). "Decision on the Lochkovian-Pragian Boundary Stratotype (Lower Devonian)" (PDF). Episodes. 12 (2): 109–114. Retrieved 18 December 2020.
^ Chlupáč, Ivo; Hladil, Jindrich (January 2000). "The global stratotype section and point of the Silurian-Devonian boundary". CFS Courier Forschungsinstitut Senckenberg. Retrieved 7 December 2020.
^ "Lochkovian Stage". Encyclopedia Britannica. Retrieved 2 October 2019.

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[Kaufmann2004-1] 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.

[Algeo1998-box-2] 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.

[Parry-3] 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. 168 (4). London: Geological Society: 863–872. doi:10.1144/0016-76492010-043.

[4] "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. September 2023. Retrieved November 10, 2024.

[Chlupac1989-5] Chlupac, Ivo; Oliver, William (June 1989). "Decision on the Lochkovian-Pragian Boundary Stratotype (Lower Devonian)" (PDF). Episodes. 12 (2): 109–114. Retrieved 18 December 2020.

[6] Chlupáč, Ivo; Hladil, Jindrich (January 2000). "The global stratotype section and point of the Silurian-Devonian boundary". CFS Courier Forschungsinstitut Senckenberg. Retrieved 7 December 2020.

[7] "Lochkovian Stage". Encyclopedia Britannica. Retrieved 2 October 2019.

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