Brown Jurassic
The Brown Jurassic or Brown Jura (German: Brauner Jura or Braunjura) in earth history refers to the middle of the three lithostratigraphic units 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 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.
Abbreviations:
- Humph.-Fm = Humphriesioolith Formation
- L.Bk-Fm = Liegende Bankkalk Formation
- H.Bk-Fm = Hangende Bankkalk Formation
- Zm-Fm = Zementmergel Formation
- S.-Fm = Solnhofen Formation
- Rö.-Fm = Rögling Formation
- U.-Fm = Usseltal Formation
- Mö.-Fm = Mörnsheim Formation
- N.-Fm = Neuburg Formation
- R.-Fm = Rennertshofen Formation