Description
Authentic Kosmatia victoris Ammonite Fossil from Mexico
This listing presents a rare and scientifically important Kosmatia victoris ammonite fossil, originating from the Tithonian stage of the Late Jurassic–Early Cretaceous boundary and preserved in the renowned deposits of Gauloris, Mexico. Dating back approximately 152–145 million years, this fossilised ammonite represents a critical period in Earth’s evolutionary history when marine faunas were diversifying and adapting during global oceanic changes. The specimen you see in the photographs is the exact piece you will receive, with the 1 cm cube providing accurate scale reference. Every fossil we sell is carefully chosen for its preservation and quality and comes with a Certificate of Authenticity.
Geological Age and Depositional Setting
The Tithonian stage is the terminal interval of the Jurassic system, followed by the Berriasian stage of the Early Cretaceous. The marine environments of what is now Mexico were strongly influenced by the Tethys Ocean, creating shallow epicontinental seas with conditions ideal for ammonite proliferation and preservation. Sediment accumulation during this period was dominated by carbonate deposition interspersed with marl layers, ensuring excellent fossilisation. Fossils such as Kosmatia victoris from Gauloris provide a valuable glimpse into the palaeoceanography of these tropical seas and allow researchers to better understand biogeographic dispersal patterns of ammonites across the Americas.
Scientific Classification
- Class: Cephalopoda
- Subclass: Ammonoidea
- Order: Ammonitida
- Superfamily: Perisphinctoidea
- Family: Ataxioceratidae
- Genus: Kosmatia
- Species: Kosmatia victoris
Belonging to the family Ataxioceratidae, this ammonite reflects the advanced evolutionary traits of Late Jurassic cephalopods, distinguished by ornate ribbing and distinctive whorl patterns. Its importance lies not only in its rarity but also in its role as a biostratigraphic marker for the Tithonian stage.
Morphological Characteristics
The shell of Kosmatia victoris typically exhibits strong ribbing that bifurcates across the flanks, lending a strikingly ornamental appearance. The whorls are evolute, with much of the inner coils exposed, creating a broad spiral structure. Its ventral area may display pronounced ornamentation, giving the ammonite a bold, sculptural look that is highly valued both scientifically and aesthetically. Such morphological details not only aided in buoyancy and movement within the ancient seas but also served as distinguishing features among ammonite species, allowing palaeontologists to classify and date strata with precision.
Palaeontological and Scientific Value
Kosmatia victoris holds significant value as an index fossil, enabling geologists to correlate Tithonian rock layers across wide regions. Its distribution within Mexico and the broader Tethyan realm highlights migratory and evolutionary adaptations during a time of changing ocean currents and ecological niches. As an ammonite species that thrived in warm shallow seas, it sheds light on the environmental conditions at the close of the Jurassic, making it a vital piece for researchers studying evolutionary trends and extinction patterns.
Collector and Display Significance
This specimen of Kosmatia victoris ammonite fossil is an exceptional addition to any fossil collection, offering both aesthetic beauty and scientific importance. Its robust ribbed ornamentation, historical context, and rarity from Gauloris, Mexico make it highly desirable for collectors, educational institutions, and museums alike. Each piece is more than a fossil—it is a direct connection to the marine life that flourished over 150 million years ago.
All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity. This Kosmatia victoris ammonite has been carefully selected for its quality and represents a fascinating chapter of natural history preserved for you to study and display.
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