The Brown Jurassic or Brown Jura (german: Brauner Jura or ''Braunjura'') in earth history refers to the middle of the three
lithostratigraphic
Lithostratigraphy is a sub-discipline of stratigraphy, the geological science associated with the study of strata or rock layers. Major focuses include geochronology, comparative geology, and petrology.
In general, strata are primarily igneou ...
units
Unit may refer to:
Arts and entertainment
* UNIT, a fictional military organization in the science fiction television series ''Doctor Who''
* Unit of action, a discrete piece of action (or beat) in a theatrical presentation
Music
* Unit (album), ...
of the
South German Jurassic
The term South German Jurassic (german: Süddeutscher Jura) in earth history is used to refer to a lithostratigraphic rock unit at the hierarchical level of a super group. The rocks of the South German Jurassic were mainly deposited during the Ju ...
, the latter being understood not as a geographical, but a geological term in the sense of a lithostratigraphic
super group. Formerly and even occasionally today in the popular scientific literature, this term is equated to the
chronostratigraphic
Chronostratigraphy is the branch of stratigraphy that studies the ages of rock strata in relation to time.
The ultimate aim of chronostratigraphy is to arrange the sequence of deposition and the time of deposition of all rocks within a geologic ...
series
Series may refer to:
People with the name
* Caroline Series (born 1951), English mathematician, daughter of George Series
* George Series (1920–1995), English physicist
Arts, entertainment, and media
Music
* Series, the ordered sets used in ...
of the
Middle Jurassic. This is however not quite correct, because the Brown Jura does not exactly coincide with the chronostratigraphic boundaries of the Middle Jurassic. In addition, the term ''Dogger'', which was formerly frequently used (and sometimes is today) as a
synonym should no longer be used in connexion with the South German Jurassic. Instead the term "Dogger" should be reserved for the roughly equivalent lithostratigraphic unit in the North German Jurassic. The Brown Jurassic was deposited about 175-161 million years ago. The Brown Jurassic follows the lithostratigraphic unit of the
Black Jurassic
The Black Jurassic or Black Jura (german: Schwarzer Jura) in earth history refers to the lowest of the three lithostratigraphic units of the South German Jurassic, the latter being understood not as a geographical, but a geological term in the ...
and is superimposed on the lithostratigraphic group of the
White Jurassic
The White Jurassic or White Jura (german: Weißer Jura or ''Weißjura'') in earth history refers to the upper of the three lithostratigraphic units of the South German Jurassic, the latter being understood not as a geographical, but a geological t ...
.
Literature
* Gert Bloos, Gerd Dietl & Günter Schweigert: ''Der Jura Süddeutschlands in der Stratigraphischen Tabelle von Deutschland 2002.'' Newsletters on Stratigraphy, 41(1-3): 263-277, Stuttgart, 2005,
* Eckhard Mönnig: ''Der Jura von Norddeutschland in der Stratigraphischen Tabelle von Deutschland 2002.'' Newsletters on Stratigraphy, 41(1-3): 253-261, Stuttgart, 2005.
* Friedrich August Quenstedt: ''Das Flözgebirge Würtembergs. Mit besonderer Rücksicht auf den Jura''. Verlag der Laupp'schen Buchhandlung, Tübingen, 1843.
* Friedrich August Quenstedt: Der Jura. Verlag der Laupp’schen Buchhandlung, Tübingen, 1856-57.
External links
*Deutsche Stratigraphische Kommission (ed.): ''Stratigraphische Tabelle von Deutschland 2002'', Potsdam, 2002.
pdfGeologische Übersicht der Schichtenfolge in Baden-Württemberg
(pdf; 183 kB)
The Middle Jurassic in Baden-Württemberg
(pdf; 20.5 kB)
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*Brown Jurassic
Jurassic System of Europe
Geologic formations of Germany