The Brown Jurassic or Brown 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 igneous ...
units
Unit may refer to:
General measurement
* Unit of measurement, a definite magnitude of a physical quantity, defined and adopted by convention or by law
**International System of Units (SI), modern form of the metric system
**English units, histo ...
of the
South German Jurassic, 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 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 i ...
of the
Middle Jurassic
The Middle Jurassic is the second Epoch (geology), epoch of the Jurassic Period (geology), Period. It lasted from about 174.1 to 161.5 million years ago. Fossils of land-dwelling animals, such as dinosaurs, from the Middle Jurassic are relativel ...
. 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
A synonym is a word, morpheme, or phrase that means precisely or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words ''begin'', ''start'', ''commence'', and ''initiate'' are a ...
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 and is superimposed on the lithostratigraphic group of the
White Jurassic.
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)
{{Authority control
*Brown Jurassic
Jurassic System of Europe