Description
This listing features a RARE and scientifically significant fossil ammonite specimen: Choffatia (Grossouvria) kontkiewiczi (Siemiradzki) from the Middle Callovian Stage of the Jurassic Period, discovered in Vienne, France. This classic French ammonite is highly sought after by collectors and is notable for its intricate ribbing and stratigraphic importance within the Jurassic sequence.
As with all our fossils, this is a 100% genuine specimen and comes with a Certificate of Authenticity (COA). The exact fossil shown in the photographs is the one you will receive. Please refer to the scale rule photo (1cm squares or cube) for full sizing.
Fossil Overview:
- Species: Choffatia (Grossouvria) kontkiewiczi (Siemiradzki)
- Common Name: Fossil Ammonite
- Geological Period: Jurassic
- Stage: Middle Callovian (~165–163 million years ago)
- Location: Vienne, France
- Preservation: Internal mould showing strong morphological detail
Geological & Depositional Environment:
The Middle Callovian in the Vienne region of France represents part of the Oxfordian Basin’s rich marine succession. This was a shallow, warm, epicontinental sea that supported prolific ammonite populations. Fossils were typically preserved in calcareous marl or limestone, indicative of low-energy, offshore marine depositional environments.
This ammonite is often used for biostratigraphic correlation across Western Europe and forms part of the Middle Callovian macrofauna, useful in refining zonal stratigraphy.
Taxonomic & Stratigraphic Details:
- Phylum: Mollusca
- Class: Cephalopoda
- Subclass: Ammonoidea
- Order: Ammonitida
- Superfamily: Perisphinctoidea
- Family: Perisphinctidae
- Genus: Choffatia (subgenus Grossouvria)
- Species: kontkiewiczi
- Formal ID: Siemiradzki
- Biozone (Tentative): Bullatimorphites bullatus or Macrocephalites gracilis Zone
Morphological Features:
- Evolute shell with moderately compressed whorls
- Strong, regular bifurcating ribbing from umbilicus to venter
- Fine ventrolateral tubercles occasionally present in well-preserved specimens
- Shell morphology suggests nektonic-predatory lifestyle, capable of fast swimming
Notable Significance:
- Stratigraphically important ammonite described by Siemiradzki
- Characteristic of the Callovian ammonite fauna of Western Europe
- Frequently referenced in regional ammonite biostratigraphy
- Attractive for both scientific and display purposes
Why Buy From Us?
- You receive the exact specimen shown in the listing photos
- Comes with a Certificate of Authenticity
- All fossils are 100% genuine and ethically sourced
- Carefully selected for scientific, historic, and aesthetic value
- Safe, secure, and prompt dispatch
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