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Rare Caumontisphinctes subfurcatum Ammonite Fossil, Callovian Jurassic, Segenthal Bavaria Germany Genuine Specimen with Certificate

Rare Caumontisphinctes subfurcatum Ammonite Fossil, Callovian Jurassic, Segenthal Bavaria Germany Genuine Specimen with Certificate

£9.00

Authentic Jurassic Ammonite from Bavaria

This listing offers a beautifully preserved Caumontisphinctes subfurcatum Ammonite Fossil from the Callovian Stage of the Middle Jurassic, discovered in Segenthal, Bavaria, Germany. Ammonites are extinct marine molluscs belonging to the subclass Ammonoidea, renowned for their coiled shells and evolutionary importance. This specimen shows strong ribbing, characteristic symmetry, and excellent detail, making it both scientifically significant and highly collectable. The photographs display the exact ammonite you will receive, with a 1 cm scale cube included for accurate sizing.

Geological Context – Callovian Stage

The Callovian Stage dates to approximately 166–163 million years ago and represents a key interval within the Middle Jurassic. This period was marked by warm, shallow epicontinental seas across Europe, where carbonate-rich sediments accumulated and provided ideal conditions for the fossilisation of marine life. Bavaria, and specifically the Segenthal region, is internationally recognised for its rich Callovian deposits, which yield a wide variety of ammonites that allow paleontologists to reconstruct marine ecosystems and refine biostratigraphy.

The depositional environment of Segenthal was a shallow, subtropical marine shelf. Fine sediments buried ammonites soon after death, protecting their shells from erosion and ensuring the preservation of intricate details such as ribbing, sutures, and whorl structure.

Species Profile – Caumontisphinctes subfurcatum

The species Caumontisphinctes subfurcatum is a representative of the family Perisphinctidae, within the order Ammonitida. Ammonites of this family are distinguished by their prominent ribbing and well-defined sutures, both of which are visible on this fossil.

Defining features of C. subfurcatum include:

  • Planispiral coiling, with shells wound in a flat spiral and lateral whorls exposed.
  • Strongly bifurcating ribs, which fork across the flanks and extend toward the outer shell.
  • A relatively compressed shell profile, contributing to a streamlined shape suitable for fast swimming.
  • Complex suture lines, providing structural reinforcement to the shell and reflecting the evolutionary advancement of the group.

These traits indicate that this ammonite was a nektonic predator, likely feeding on small fish and invertebrates while actively navigating the warm Jurassic seas.

Scientific and Collectible Importance

Caumontisphinctes subfurcatum is significant not only for its striking morphology but also for its role as an index fossil, essential for dating and correlating Callovian rock layers across Europe. Its distinctive ribbing and rapid evolutionary turnover make it particularly valuable in paleontological research. For collectors, this ammonite represents both a scientifically relevant specimen and a visually appealing fossil that highlights the diversity of Jurassic marine life.

Genuine Fossil with Certificate of Authenticity

This ammonite fossil is a 100% genuine specimen, carefully chosen for its clarity and preservation. It comes complete with a Certificate of Authenticity, ensuring its provenance and value for collectors, educational use, and display.

A Unique Fossil for Any Collection

This Caumontisphinctes subfurcatum ammonite fossil from Segenthal, Bavaria, Germany combines aesthetic beauty with scientific depth. Its ribbed whorls and Jurassic age make it an exceptional addition to natural history collections, geological displays, or as a remarkable gift for fossil enthusiasts.

Scale Rule Squares / Cube = 1 cm. Please refer to listing photos for the full sizing of this exact specimen.

(Actual as seen)

Only 1 left in stock

SKU: SF1267 Category:

Description

Authentic Jurassic Ammonite from Bavaria

This listing offers a beautifully preserved Caumontisphinctes subfurcatum Ammonite Fossil from the Callovian Stage of the Middle Jurassic, discovered in Segenthal, Bavaria, Germany. Ammonites are extinct marine molluscs belonging to the subclass Ammonoidea, renowned for their coiled shells and evolutionary importance. This specimen shows strong ribbing, characteristic symmetry, and excellent detail, making it both scientifically significant and highly collectable. The photographs display the exact ammonite you will receive, with a 1 cm scale cube included for accurate sizing.

Geological Context – Callovian Stage

The Callovian Stage dates to approximately 166–163 million years ago and represents a key interval within the Middle Jurassic. This period was marked by warm, shallow epicontinental seas across Europe, where carbonate-rich sediments accumulated and provided ideal conditions for the fossilisation of marine life. Bavaria, and specifically the Segenthal region, is internationally recognised for its rich Callovian deposits, which yield a wide variety of ammonites that allow paleontologists to reconstruct marine ecosystems and refine biostratigraphy.

The depositional environment of Segenthal was a shallow, subtropical marine shelf. Fine sediments buried ammonites soon after death, protecting their shells from erosion and ensuring the preservation of intricate details such as ribbing, sutures, and whorl structure.

Species Profile – Caumontisphinctes subfurcatum

The species Caumontisphinctes subfurcatum is a representative of the family Perisphinctidae, within the order Ammonitida. Ammonites of this family are distinguished by their prominent ribbing and well-defined sutures, both of which are visible on this fossil.

Defining features of C. subfurcatum include:

  • Planispiral coiling, with shells wound in a flat spiral and lateral whorls exposed.
  • Strongly bifurcating ribs, which fork across the flanks and extend toward the outer shell.
  • A relatively compressed shell profile, contributing to a streamlined shape suitable for fast swimming.
  • Complex suture lines, providing structural reinforcement to the shell and reflecting the evolutionary advancement of the group.

These traits indicate that this ammonite was a nektonic predator, likely feeding on small fish and invertebrates while actively navigating the warm Jurassic seas.

Scientific and Collectible Importance

Caumontisphinctes subfurcatum is significant not only for its striking morphology but also for its role as an index fossil, essential for dating and correlating Callovian rock layers across Europe. Its distinctive ribbing and rapid evolutionary turnover make it particularly valuable in paleontological research. For collectors, this ammonite represents both a scientifically relevant specimen and a visually appealing fossil that highlights the diversity of Jurassic marine life.

Genuine Fossil with Certificate of Authenticity

This ammonite fossil is a 100% genuine specimen, carefully chosen for its clarity and preservation. It comes complete with a Certificate of Authenticity, ensuring its provenance and value for collectors, educational use, and display.

A Unique Fossil for Any Collection

This Caumontisphinctes subfurcatum ammonite fossil from Segenthal, Bavaria, Germany combines aesthetic beauty with scientific depth. Its ribbed whorls and Jurassic age make it an exceptional addition to natural history collections, geological displays, or as a remarkable gift for fossil enthusiasts.

Scale Rule Squares / Cube = 1 cm. Please refer to listing photos for the full sizing of this exact specimen.

Additional information

Era

Jurassic
Origin

Germany

Jurassic Information

The Jurassic Period (201–145 million years ago) was the golden age of dinosaurs, with iconic species like Brachiosaurus, Stegosaurus, and Allosaurus dominating the land. It was a time of warm, humid climates, with high sea levels that created vast shallow seas, supporting abundant marine reptiles, ammonites, and early coral reefs. The first birds, such as Archaeopteryx, evolved from small theropod dinosaurs, while early mammals remained small and nocturnal. Lush forests of cycads, conifers, and ferns covered the land, providing food for giant herbivores. The breakup of the supercontinent Pangaea accelerated, shaping Earth's geography and setting the stage for the diverse ecosystems of the Cretaceous.

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