Description
Rare Amoeboceras serratum Fossil Ammonite from Cambridgeshire, UK
This listing offers a rare Amoeboceras serratum fossil ammonite, preserved within the Ampthill Clay Formation of St Ives, Cambridgeshire, England. Dating from the Oxfordian stage of the Late Jurassic (c. 163–157 million years ago), this specimen represents one of the most scientifically valuable and visually striking ammonites from Britain. Carefully selected and photographed with a 1 cm scale cube for accurate sizing, this is the exact fossil you will receive. Every piece is 100% genuine and supplied with a Certificate of Authenticity.
Geological Context and Formation
The specimen originates from the Ampthill Clay Formation, a well-documented Oxfordian marine deposit in eastern England. During this time, much of Britain lay beneath a shallow, warm, epicontinental sea. Fine silts and clays accumulated in quiet marine environments, later hardening into the deposits where ammonites such as Amoeboceras serratum were preserved.
This unit is of particular significance because the presence of Amoeboceras serratum helps define the Serratum Zone, an internationally recognised biostratigraphic marker within the Oxfordian stage. This makes fossils of this species especially valuable to both collectors and geologists for dating and correlating Jurassic sequences across Europe.
Species Details and Classification
- Genus: Amoeboceras
- Species: serratum
- Order: Ammonitida
- Superfamily: Perisphinctoidea
- Family: Cardioceratidae
- Age: Oxfordian Stage, Late Jurassic
Ammonites of the genus Amoeboceras are highly significant index fossils, known for their distinctive ribbing, compact coiling, and evolutionary importance within the Cardioceratidae family.
Morphological Features
This Amoeboceras serratum fossil ammonite displays several key identifying features, including:
- Strong, dense ribbing across the whorls, giving the shell its “serrated” appearance.
- Involute coiling, with inner whorls partly concealed by later growth.
- Compressed shell morphology, typical of the genus.
- Fine ornamental detail along the ribs, demonstrating evolutionary adaptations in shell design.
These features make A. serratum both scientifically diagnostic and visually distinctive.
Scientific and Stratigraphic Importance
Ammonites such as Amoeboceras serratum are among the most important index fossils of the Late Jurassic. Their rapid evolution and wide distribution allow geologists to establish precise biostratigraphic zones, such as the Serratum Zone in which this species is characteristic. This makes specimens like this one essential for stratigraphic correlation and dating in Jurassic paleontology.
Collector and Display Value
- Scientific Value: A key index ammonite tied to a recognised Oxfordian biozone.
- Collector’s Piece: Its rarity from Cambridgeshire makes it highly desirable.
- Educational Use: Ideal for illustrating Jurassic ammonite diversity and stratigraphic utility.
- Display Quality: With its detailed ribbing and classic ammonite form, it stands out as a striking fossil for display in any collection.
Authenticity and Guarantee
This fossil has been carefully sourced from the St Ives, Cambridgeshire Ampthill Clay Formation and is offered with a Certificate of Authenticity. All specimens are guaranteed genuine and represent an authentic piece of Earth’s deep history.
Key Information
- Fossil Type: Ammonite
- Species: Amoeboceras serratum
- Age: Late Jurassic, Oxfordian (c. 163–157 million years old)
- Geological Formation: Ampthill Clay
- Location: St Ives, Cambridgeshire, United Kingdom
- Zone: Serratum Zone (index fossil significance)
- Family: Cardioceratidae
- Authenticity: Guaranteed genuine with Certificate of Authenticity
This rare Amoeboceras serratum fossil ammonite from Cambridgeshire is a scientifically significant and visually striking specimen that links directly to the Oxfordian seas of Jurassic Britain. It is an exceptional addition to any fossil collection, geological study, or educational display.
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