Rare Sigaloceras planicircuit Ammonite Fossil Jurassic South Cave Humberside UK COA

Description

Authentic Jurassic Fossil from South Cave, Humberside

This rare Sigaloceras planicircuit ammonite fossil is an exceptional specimen from the Lower Callovian stage of the Middle Jurassic, discovered in South Cave, Humberside, United Kingdom. Carefully selected for its scientific significance and visual appeal, it provides a unique opportunity to own a genuine relic of Earth’s ancient seas. Every fossil we offer is guaranteed authentic and comes with a Certificate of Authenticity. The photographs provided show the actual specimen you will receive, with scale rule squares of 1 cm included to give accurate sizing.

Geological Age and Provenance

Dating to the Lower Callovian stage, approximately 166–163 million years ago, this ammonite lived during a period of dynamic marine expansion in Europe. The region of South Cave, situated in present-day Humberside, was once part of a shallow marine environment that formed extensive sedimentary deposits rich in marine life. The Callovian is well known for its fossiliferous strata, particularly the mudstones and clays that captured and preserved ammonites in remarkable detail. Such conditions ensured that shells like those of Sigaloceras were fossilised with exceptional clarity, making them invaluable to both collectors and scientists.

Fossil Species and Classification

Sigaloceras planicircuit belongs to the class Cephalopoda, order Ammonitida, within the superfamily Stephanoceratoidea. Ammonites of this genus are characterised by their compressed, planispiral shells with distinctive ribbing patterns and strong ornamentation. The whorls are relatively flattened, with ribs that extend gracefully across the shell, contributing to the fossil’s striking appearance. These morphological traits not only help to identify the species but also make it a highly sought-after specimen among collectors of Jurassic ammonites.

Morphology and Distinctive Traits

The specimen displays the diagnostic features of Sigaloceras planicircuit, including finely preserved ribbing and whorl structure. The ribbing pattern is bold yet symmetrical, and the planispiral form of the shell provides a clear example of Callovian ammonite morphology. Such characteristics are not only aesthetically appealing but also serve an important scientific role, as the shell structure and ornamentation are key markers used in paleontological identification and biostratigraphic correlation.

Scientific and Stratigraphic Significance

Ammonites like Sigaloceras planicircuit are highly valued in stratigraphy because they act as index fossils, helping geologists define specific biozones within the Jurassic. The presence of this ammonite in the Lower Callovian layers contributes to our understanding of faunal succession and the evolutionary pathways of cephalopods during this geological interval. Collectors and researchers appreciate such fossils not only for their visual beauty but also for their role in piecing together the history of Earth’s marine environments.

Condition and Presentation

This specimen has been carefully cleaned and stabilised to preserve its natural form while retaining all visible morphological details. The ribbing, growth lines, and shell curvature are sharply defined, making it both a scientifically valuable and visually captivating piece. This is a genuine, one-of-a-kind fossil—not a cast or reproduction. The photos show the exact specimen you will receive, giving you complete confidence in your purchase.

Guarantee of Authenticity

All of our fossils are 100% genuine specimens and are supplied with a Certificate of Authenticity. This guarantees that your fossil has been ethically sourced and scientifically identified. With its rarity, scientific value, and striking preservation, this Sigaloceras planicircuit ammonite fossil from South Cave, Humberside, is an outstanding addition for collectors, educators, and natural history enthusiasts alike.