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Showing results for tags 'achdorf formation'.
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The subgenus Ludwigella is a collective term for what are believed to be microconches for the genus Graphoceras.
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- ludwigella
- rudis
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(and 5 more)
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Calcite mold of the phragmocone.
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- a144
- graphoceras
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(and 5 more)
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Calcite mold. This extremely variable species was newly erected in 2014 by Dietze etal. Literature: V.Dietze etal, Aalenian (Middle Jurassic) ammonites and stratigraphy of the Geisingen clay pit (SW Germany), Palaeodiversity 7: 61–127; Stuttgart 30 December 2014.
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Well preserved shell on one side; up to the end of the phragmocone on the other.
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- aalenian
- concavum zone
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This is just part of the phragmocone, so it would have been quite large in real life.
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- parammatoceras
- geisingen
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(and 3 more)
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Calcite mold of the phragmocone and part of the body chamber.
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- murchisonae zone
- achdorf formation
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This specimen has retained most of the shell on the body chamber and is practically complete, with the exception of the small missing section of whorl which I replaced with stone meal. This was left intentionally so that one can see the repair. It has a calcified internal mold.
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- geisingen
- achdorf formation
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(and 3 more)
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Calcite mold.
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- eudmetoceras
- geisingen
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(and 3 more)
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Almost complete with the shell partially preserved. Old German Chronostraigraphy: Dogger (Braunjura) beta 1
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- staufenia
- sehndensis
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Index fossil of the bradfordensis zone. Phragmocone showing typical rib structure. The last photo shows another sample which illustrates how large these ammonites could get. The diameter is 20cm. and this is still just the phragmocone. Lithology: Geisingen-Oolith The Geisingen-Oolith is a horizon which was built and reworked over a long stretch of time at the coastal fringe of an arm of the Tethys ocean. Fauna from both the concavum and the bradfordensis zones are to be found in it. Old German Chronostratigraphy: Dogger (Braunjura) beta Literature: Dietze et al (2014): Aalenian (Middle Jurassic) ammonites and stratigraphy of the Geisingen clay pit (SW Germany). Palaeodiversity 7: 61-127
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- brasilia bradfordensis
- a185
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This is the index fossil of the concavum zone. Most of the shell is preserved, as is a small portion of the body chamber. These ammonites could reach a good size, as shown by the sample in the last 2 photos, which has a circumference of 21cm. Lithography: Geisingen-Oolith The Geisingen-Oolith is a horizon which was built and reworked over a long stretch of time at the coastal fringe of an arm of the Tethys ocean. Fauna from both the concavum and the bradfordensis zones are to be found in it. Old German Chronostratigraphy: Dogger (Braunjura) beta Literature: Dietze et al (2014): Aalenian (Middle Jurassic) ammonites and stratigraphy of the Geisingen clay pit (SW Germany). Palaeodiversity 7: 61-127
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To be seen on the matrix below the ammonite are 2 Myophorella formosa bivalves on the right and a Staufenia opalinoides ammonite. The shell on one side is completely preserved. The other side shows the calcite mold with sutures on the phragmocone. Only a small section of the body chamber on this specimen is preserved. If complete, it would probably have had a diameter of approximately 16cm. This is the index fossil of the subzone. Old German Chronostratigraphy: Dogger (Braunjura) beta Literature: Rieber,H. (1963): Ammoniten und Stratigraphie des Braunjura beta der Schwaebischen Alb, Palaeontographica Bd.122,Abt.A, Pp.1-89