Lochkovian

419.2 ± 3.2 – 410.8 ± 2.8 Ma

PreꞒ

Ꞓ

Chronology

−420 —

–

−415 —

–

−410 —

–

−405 —

–

−400 —

–

−395 —

–

−390 —

–

−385 —

–

−380 —

–

−375 —

–

−370 —

–

−365 —

–

−360 —

–

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^[6]

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^[5]

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

doi:10.1144/0016-76492010-043
.

doi:10.1086/421077
.

doi:10.1098/rstb.1998.0195
.

^ "Chart/Time Scale". www.stratigraphy.org. International Commission on Stratigraphy.

^ ^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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