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TheLochkovian is one of threefaunal stages in theEarly Devonian Epoch. It lasted from 419.62 ± 1.36 million years ago to 413.02 ± 1.91 million years ago. It marked the beginning of the Devonian Period, and was followed by thePragian Stage. It is named after the village ofLochkov in the Czech Republic, now part of the city ofPrague.^[7] The GSSP is located within theLochkow Formation at the Klonk Section in Prague.

In North America the Lochkovian Stage is represented byGedinnian orHelderbergian time.

References

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^Kaufmann, Bernd; Trapp, Endres; Mezger, Klaus (July 2004)."The numerical age of the Upper Frasnian (Upper Devonian) Kellwasser horizons: A new U-Pb zircon date from Steinbruch Schmidt (Kellerwald, Germany)"(PDF).The Journal of Geology.112 (4):495–501.Bibcode:2004JG....112..495K.doi:10.1086/42107.eISSN 1537-5269.ISSN 0022-1376.JSTOR 421077.LCCN 25013118.OCLC 1608377.S2CID 129963970. Archived fromthe original(PDF) on February 10, 2024. RetrievedDecember 16, 2025.
^Algeo, Thomas; Scheckler, Stephen E. (January 29, 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.eISSN 1471-2970.PMC 1692181.S2CID 84656565.
^Parry, Stephen F.; Noble, Stephen R.; Crowley, Quentin C.; Wellman, Charles H. (June 15, 2011)."A high-precision U–Pb age constraint on the Rhynie Chert Konservat-Lagerstätte: time scale and other implications"(PDF).Journal of the Geological Society.168 (4).Geological Society of London:863–872.Bibcode:2011JGSoc.168..863P.doi:10.1144/0016-76492010-043.eISSN 2041-479X.ISSN 0016-7649.LCCN 79641612.OCLC 1934542.S2CID 128679831.Archived(PDF) from the original on July 11, 2025. RetrievedDecember 16, 2025.
^"International Chronostratigraphic Chart"(PDF).International Commission on Stratigraphy. December 2024. RetrievedOctober 23, 2025.
^^a ^bChlupac, Ivo; Oliver, William (June 1989)."Decision on the Lochkovian-Pragian Boundary Stratotype (Lower Devonian)"(PDF).Episodes.12 (2):109–114. Retrieved18 December 2020.
^Chlupáč, Ivo; Hladil, Jindrich (January 2000)."The global stratotype section and point of the Silurian-Devonian boundary".CFS Courier Forschungsinstitut Senckenberg. Retrieved7 December 2020.
^"Lochkovian Stage".Encyclopedia Britannica. Retrieved2 October 2019.

Geological history of Earth

Cenozoic Era
(present–66.0 Ma)

Quaternary(present–2.58 Ma)	Holocene (present–11.7 ka) Pleistocene (11.7 ka–2.58 Ma)
Neogene(2.58–23.0 Ma)	Pliocene (2.59–5.33 Ma) Miocene (5.33–23.0 Ma)
Paleogene(23.0–66.0 Ma)	Oligocene (23.0–33.9 Ma) Eocene (33.9–56.0 Ma) Paleocene (56.0–66.0 Ma)

Mesozoic Era
(66.0–252 Ma)

Cretaceous(66.0–145 Ma)	Late (66.0–100 Ma) Early (100–145 Ma)
Jurassic(145–201 Ma)	Late (145–164 Ma) Middle (164–174 Ma) Early (174–201 Ma)
Triassic(201–252 Ma)	Late (201–237 Ma) Middle (237–247 Ma) Early (247–252 Ma)

Paleozoic Era
(252–539 Ma)

Permian(252–299 Ma)	Lopingian (252–260 Ma) Guadalupian (260–272 Ma) Cisuralian (272–299 Ma)
Carboniferous(299–359 Ma)	Pennsylvanian (299–323 Ma) Mississippian (323–359 Ma)
Devonian(359–419 Ma)	Late (359–383 Ma) Middle (383–393 Ma) Early (393–419 Ma)
Silurian(419–444 Ma)	Pridoli (419–423 Ma) Ludlow (423–427 Ma) Wenlock (427–433 Ma) Llandovery (433–444 Ma)
Ordovician(444–485 Ma)	Late (444–458 Ma) Middle (458–470 Ma) Early (470–485 Ma)
Cambrian(485–539 Ma)	Furongian (485–497 Ma) Miaolingian (497–509 Ma) Series 2 (509–521 Ma) Terreneuvian (521–539 Ma)

Proterozoic Eon
(539 Ma–2.5 Ga)

Neoproterozoic(539 Ma–1 Ga)	Ediacaran (539–635 Ma) Cryogenian (635–720 Ma) Tonian (720 Ma–1 Ga)
Mesoproterozoic(1–1.6 Ga)	Stenian (1–1.2 Ga) Ectasian (1.2–1.4 Ga) Calymmian (1.4–1.6 Ga)
Paleoproterozoic(1.6–2.5 Ga)	Statherian (1.6–1.8 Ga) Orosirian (1.8–2.05 Ga) Rhyacian (2.05–2.3 Ga) Siderian (2.3–2.5 Ga)