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Encyclopedia > Pliensbachian

The Pliensbachian (also known as Charmouthian) is a stage of the Early Jurassic Epoch. It spans the time between 189.6 ± 1.5 Ma and 183 ± 1.5 Ma (million years ago). Faunal stages are a subdivision of geologic time used primarily by paleontologists who study fossils rather than by geologists who study rock formations. ... Lower Jurassic (also known as Lias) is the earliest of three epochs of the Jurassic period. ... The word epoch can mean either an interval of time, or a particular point in time used as a reference point. ... Annum is a Latin term meaning year. ...


References

  • GeoWhen Database - Pliensbachian
Jurassic period
Lower/Early Jurassic Middle Jurassic Upper/Late Jurassic
Hettangian Sinemurian Aalenian Bajocian Oxfordian Kimmeridgian
Pliensbachian Toarcian Bathonian Callovian Tithonian

  Results from FactBites:
 
Sinemurian and Pliensbachian ammonites (NW Germany) (434 words)
At Herford-Diebrock a section from the Upper Sinemurian (Raricostatum to Aplanatum Subzone) to the Lower Pliensbachian (Polymorphus Subzone) is studied in respect of its ammonite faunas.
The section of Herford-Diebrock was chosen to study the Sinemurian/Pliensbachian boundary in respect of the search for a GSSP (Global Standard Stratotype-section and Point) by members of the Sinemurian/Pliensbachian boundary working group because it seemed to be a possible candidate for the GSSP.
Unfortunately we must conclude that the section failed because (1) the position of the base of the Pliensbachian could not be prooved by ammonites, (2) the microfaunal content is strongly degraded and (3) palynomorphs are destroyed by plutonic heat influence.
Early Jurassic climate change and the radiation of organic-walled phytoplankton in the Tethys Ocean Paleobiology - Find ... (899 words)
The radiation coincides with a long-term eustatic rise and overall increase in the areal extent of continental shelves, a factor critical to cyst germination.
The former diversification is consistent with the opening of the Hispanic Corridor during the late Sinemurian, which apparently allowed the pioneer dinoflagellate, Liasidium variabile, to invade the Tethys from the Paleo-Pacific.
A true radiation pulse during the late Pliensbachian, with predominantly cold-water taxa, occurred during sea level fall, suggesting that climate change was critical to setting the evolutionary tempo.
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