Pseudoosterella helicas Ammonite Fossil from Lower Hauterivian Cretaceous Whale Chine Isle of Wight UK

Description

Geological Context and Provenance

This specimen is a genuine Pseudoosterella helicas ammonite fossil from the Lower Hauterivian Stage of the Early Cretaceous Period, approximately 133 – 130 million years ago. It originates from the Whale Chine locality on the Isle of Wight, United Kingdom, an area celebrated for its diverse Cretaceous marine deposits. The Isle of Wight is one of Britain’s most famous fossil-bearing regions, with exposures that have provided palaeontologists with a wealth of material for study.

The Hauterivian Stage lies between the Valanginian and Barremian and represents an important interval in Early Cretaceous Earth history. Fossils from this stage provide vital data for reconstructing ancient ecosystems and refining global biostratigraphic frameworks. Ammonites such as Pseudoosterella helicas are particularly important because they serve as index fossils, allowing geologists to accurately date and correlate marine strata.

Fossil Type and Species Information

Pseudoosterella helicas belongs to the Order Ammonitida, Superfamily Perisphinctoidea, and Family Neocomitidae. This genus is known for its ornate shell features, distinctive ribbing, and regular coiling, which make specimens highly recognisable and scientifically valuable.

As a member of the Neocomitidae, Pseudoosterella helicas represents a group of ammonites that flourished during the Early Cretaceous. Its well-preserved features provide insights into evolutionary adaptations that enabled ammonites to dominate marine environments for millions of years.

Morphological Features and Identification

This fossil displays the diagnostic characteristics of Pseudoosterella helicas. The shell is evolute, exposing earlier whorls, and decorated with prominent ribs that sweep elegantly across the flanks and continue across the venter. The ribbing pattern is bold and symmetrical, giving the fossil an attractive, sculptured appearance.

The ribs may bifurcate or show gentle branching, features that are typical of this species. Such traits are not only visually striking but also assist palaeontologists in distinguishing Pseudoosterella helicas from other related ammonites. Like other members of the group, the shell would have been chambered, allowing the animal to regulate buoyancy and live as an active swimmer in the shallow Cretaceous seas.

Depositional Environment

During the Lower Hauterivian, Whale Chine and the surrounding Isle of Wight formed part of a shallow marine system on the margins of the Tethys Ocean. The environment was warm, subtropical, and rich in nutrients, sustaining diverse marine life. Ammonites, belemnites, gastropods, bivalves, and echinoids thrived alongside larger marine reptiles such as plesiosaurs and ichthyosaurs.

The sediments here were dominated by clays, marls, and limestones, which created favourable conditions for fossilisation. Ammonites such as Pseudoosterella helicas were rapidly buried after death, preserving fine details of their shell morphology.

Collector Appeal and Authenticity

This Pseudoosterella helicas ammonite fossil is both scientifically valuable and aesthetically appealing. Its strong ribbing, classic coiling, and provenance from the renowned Isle of Wight deposits make it an excellent specimen for collectors, educators, and natural history enthusiasts.

• 100% Genuine Specimen – Comes with a Certificate of Authenticity.
• Exact Fossil Shown – The photographs depict the actual fossil you will receive.
• Scale Reference – Scale rule squares / cube = 1 cm. Please see photos for accurate measurements.

This carefully chosen Pseudoosterella helicas ammonite fossil encapsulates the natural beauty and scientific importance of Early Cretaceous ammonites, offering a remarkable addition to any fossil collection or display.