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Fossils of the Renggeri Marl

The Book Chapters

By Roland Himmler



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The sites / locations

Looked for in Germany and the Swiss/French Jura mountains

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Location Tarcenay road :
Border M/U Jurassic 

In my opinion it is/was the ideal outcrop at the border of Middle / Upper Jurassic

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The geological segmentation of                  
different authors        

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Trial of a stratigraphical correlation

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Some faunal profiles as an overview
(Creniceras renggeri)

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The older part of the Renggeri Marl

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Locations of de Loriol

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Species time range

and chronological structure

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Problem when comparing  a  "faunal  spectrum"

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To a beach of today by waves:

Different groups and their shares 

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To a beach of today by waves:

Different groups and their shares 

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Morphology / Sutur line

No contradiction to literature, in here just shown for better understanding

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The logarithmical spiral

The impact of the logarithmical spiral on the shell is not discussed in literature

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Diameter / Number of windings / Size

(See also snails of today)
Influence of the protoconch on the shell size is not discussed in literature 

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The collection / Variation width

Examples from Renggeri Marl.
For you to try to give a name.

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“Picked up” versus “in situ” (=digged)

Finding places: if layers are horizontal, there is no difference between “picked up” and “in situ”.

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Pros and cons “in situ ” versus “picking-up”

Characteristics of a fana profile of a certain location stays quite stable after several visits when number of findings is above a certain amount (approx. 200)

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Determining of names 

(Subkommission fuer Jura-Stratigraphie and Prof.L.Hottinger – Uni Basel CH)
Giving names seem to be impossible but necessary.

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Bulla striata / Mediterranean

How to determine the name of a species

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The faunal spectrum of a sub-chrones

The late lamberti Subchron

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Abnormal shells

Besides Hoelder, who in general restricts his comments on nomenclature, there seem to be no further hints in literature. Possibly because findings of these fossils are too scarce. 

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How does Cr. renggeri looks like ?

Possibly more species than only Cr. renggeri and piae do exist within Renggeri Marl.

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within Creniceras renggeri. micro- and Macro-conch do exist

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“Close-up of sutur lines”

Top right: “HURT” (X) = sudden close-up -> normal
Bottom: Sudden close-up = micro-conch

The example top/right is possibly one out of hundred thousand.

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Scaphidodites and dimorphismus 

within Scaphidodites scaphitoides micro- and Macro-conch plus a new dimorph species (Scaphitodites gygii n.sp.) do exist

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The accompanying fauna

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recent sea snails versus Ammonite 

As it looks like micro- and Macro-Conches seem to exist within recent sea snails as well.

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Washed to a beach

Spirula spirula, crab and sea urgins
Surprisingly such fragile objects could be washed ashore without being damaged.

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Sorted by “current” ??

Land snails of to-day can gather “without” (?) external influence. In this case they gather at the coolest point of their living area (breeze gives a bit cooling compared to the bottom)(no fact, too much interpretation).

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Fossil types and beach of to-day

of the Renggeri Marl and beaches of today

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Beach findings – usefull informations for fossils ?

Findings of to-day helping to explain fossil findings (hard ground necessary for corals to settle tec,).

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“New findings”

At a first view, looking from the side they seem to be the same / very similar (though for sure they are different species, ….. though only ONE finding).

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Morphology / Jaw ?

Truc de Balduc /Mende – Frankreich
Urweltmuseum Hauff, Holzmaden / D

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Pyritized findings as “dwarf” species 

Top row: both Q. lamberti from Villers-s/s-MER (pyritized) and Herznach/CH (clay).
Below: C. cordatum (clay) nearly same size as lamberti at the top.
People in generall believe, pyritized ammonites are dwarf individuals

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Other information:

How does calcite get into pyritised phragmocone
Unusual: Sutur line visible though inner part filling totally with calcit (UK_Charmouth07)

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Other information:

Living chamber filling as fossil trap

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Other information:

Building of pyrite

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Other information:

Do Spines help for defense ?

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Other information – empty spines

Comparison with snails of to-day

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General literature 

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Special literature 

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Codification principles ‘Geology’

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Information source fossils / Fossils in literature

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Number of findings
By location

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Statistical material

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Statistical analysis

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The collection

Explanations of abreviations

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The collection

Findings by ammonite zones and locations

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Information source fossils

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Plates in appendix for determimation of species names
1) Ammonites, plates 1.1 - 27.2. (VIEW)
2) Companion fauna 28.1 - 39.2
3) Ammonites by sub-zones, plates 40.1 - 42.1

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