Early Jurassic

First epoch of the Jurassic Period / From Wikipedia, the free encyclopedia

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The Early Jurassic Epoch (in chronostratigraphy corresponding to the Lower Jurassic Series) is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassic-Jurassic extinction event, 201.3 Ma (million years ago), and ends at the start of the Middle Jurassic 174.7 ±0.8 Ma.

Quick facts: Early/Lower Jurassic, Chronology, Etymology, ...
Early/Lower Jurassic
201.3 ± 0.2 – 174.7 ± 0.8 Ma
Chronostratigraphic nameLower Jurassic
Geochronological nameEarly Jurassic
Name formalityFormal
Usage information
Celestial bodyEarth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Chronological unitEpoch
Stratigraphic unitSeries
Time span formalityFormal
Lower boundary definitionFAD of the Ammonite Psiloceras spelae tirolicum.
Lower boundary GSSPKuhjoch section, Karwendel mountains, Northern Calcareous Alps, Austria
47.4839°N 11.5306°E / 47.4839; 11.5306
Lower GSSP ratified2010[2]
Upper boundary definitionFAD of the Ammonites Leioceras opalinum and Leioceras lineatum
Upper boundary GSSPFuentelsaz, Spain
41.1708°N 1.8333°W / 41.1708; -1.8333
Upper GSSP ratified2000[3]

Certain rocks of marine origin of this age in Europe are called "Lias" and that name was used for the period, as well, in 19th-century geology.[4] In southern Germany rocks of this age are called Black Jurassic.