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The top of the Sinemurian (the base of the Pliensbachian) is at the first appearances of the ammonite species '' Bifericeras donovani'' and ammonite genus '' Apoderoceras''.
The Sinemurian contains six ammonite biozones in the Tethys domain:
*zone of ''
PDF
*; 2004: ''A Geologic Time Scale 2004'',
GeoWhen Database - SinemurianLower Jurassic timescale
at the website of the subcommission for stratigraphic information of the ICS
Stratigraphic chart of the Lower Jurassic
at the website of Norges Network of offshore records of geology and stratigraphy {{Geological history, p, m *02 Geological ages
geologic timescale
The geologic time scale, or geological time scale, (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geoch ...
, the Sinemurian is an age and stage in the Early or Lower Jurassic Epoch or Series. It spans the time between 199.3 ± 2 Ma and 190.8 ± 1.5 Ma (million years ago). The Sinemurian is preceded by the Hettangian and is followed by the Pliensbachian
The Pliensbachian is an age of the geologic timescale and stage in the stratigraphic column. It is part of the Early or Lower Jurassic Epoch or Series and spans the time between 190.8 ± 1.5 Ma and 182.7 ± 1.5 Ma (million years ago). The ...
.
In Europe the Sinemurian age, together with the Hettangian age, saw the deposition of the lower Lias, in Great Britain known as the Blue Lias.
Stratigraphic definitions
The Sinemurian Stage was defined and introduced into scientific literature by French palaeontologist Alcide d'Orbigny in 1842. It takes its name from the French town of Semur-en-Auxois, nearDijon
Dijon (, , ) (dated)
* it, Digione
* la, Diviō or
* lmo, Digion is the prefecture of the Côte-d'Or department and of the Bourgogne-Franche-Comté region in northeastern France. the commune had a population of 156,920.
The earl ...
. The calcareous
Calcareous () is an adjective meaning "mostly or partly composed of calcium carbonate", in other words, containing lime or being chalky. The term is used in a wide variety of scientific disciplines.
In zoology
''Calcareous'' is used as an a ...
soil formed from the Jurassic limestone
Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms wh ...
of the region is in part responsible for the character of the classic Sancerre wines.
The base of the Sinemurian Stage is at the first appearance of the ammonite genera '' Vermiceras'' and ''Metophioceras
''Metoioceras'' is an extinct genus of cephalopod belonging to the Ammonite subclass which lived during the Cenomanian
The Cenomanian is, in the ICS' geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest s ...
'' in the stratigraphic record. A global reference profile ( GSSP or golden spike) for the Sinemurian Stage is located in a cliff north of the hamlet of East Quantoxhead
East Quantoxhead is a village in the district of Somerset West and Taunton, from West Quantoxhead, east of Williton, and west of Bridgwater, within the Quantock Hills Area of Outstanding Natural Beauty in Somerset, England.
History
Above the ...
, east of Watchet, Somerset, England
England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe ...
.See for the description of the GSSP Bloos & Page (2001)
The top of the Sinemurian (the base of the Pliensbachian) is at the first appearances of the ammonite species '' Bifericeras donovani'' and ammonite genus '' Apoderoceras''.
The Sinemurian contains six ammonite biozones in the Tethys domain:
*zone of ''Echioceras raricostatum
''Echioceras'' is an extinct genus of ammonites from the Early Jurassic of Europe and North America.
Description
Shell of ''Echioceras'' species can reach a diameter of about .. The narrow and broad evolute shell is reinforced by fine ribs on in ...
''
*zone of '' Oxynoticeras oxynotum''
*zone of '' Asteroceras obtusum''
*zone of '' Caenisites turneri''
*zone of ''Arnioceras semicostatum
''Arnioceras'' is an extinct genus of large, evolute, discoidal ammonite from the Lower Jurassic. The shell is normally coiled so that all whorls are exposed. Sides bear strong sharp ribs that are straight until reaching the ventrolateral edg ...
''
*zone of '' Arietites bucklandi''
References
Sources
*; 2001: ''Global Stratotype Section and Point for base of the Sinemurian Stage (Lower Jurassic)'', Episodes 25(1), pp. 22–28*; 2004: ''A Geologic Time Scale 2004'',
Cambridge University Press
Cambridge University Press is the university press of the University of Cambridge. Granted letters patent by Henry VIII of England, King Henry VIII in 1534, it is the oldest university press in the world. It is also the King's Printer.
Cambr ...
.
*; 1842: ''Paléontologie française. 1. Terrains oolitiques ou jurassiques'', Bertrand, Paris.
See also
* Komlosaurus carbonisExternal links
GeoWhen Database - Sinemurian
at the website of the subcommission for stratigraphic information of the ICS
Stratigraphic chart of the Lower Jurassic
at the website of Norges Network of offshore records of geology and stratigraphy {{Geological history, p, m *02 Geological ages