Description
Authentic 4.5″ Gulielmiceras gulielm Ammonite Fossil – Jurassic of Yorkshire
This specimen is a 4.5 inch Gulielmiceras gulielm ammonite fossil, originating from the Kellaways Beds, Lower Callovian Stage of the Middle Jurassic, and collected at Newbold Quarry, Hull, Yorkshire, United Kingdom. Beautifully preserved, this ammonite displays characteristic ribbing and morphology associated with the genus Gulielmiceras. Supplied with a Certificate of Authenticity, it represents an impressive fossil both for collectors and for those interested in the geology of Britain’s Jurassic heritage. The photographs show the actual fossil you will receive, with a 1 cm scale cube included for reference.
Geological Age and Provenance
The Lower Callovian Stage (approximately 166–163 million years ago) is part of the Middle Jurassic and represents a significant interval of marine sedimentation in Britain. The Kellaways Beds of Yorkshire are well known for their fossil content, particularly ammonites, which are vital for biostratigraphy. This specimen, collected from Newbold Quarry near Hull, comes from one of the classic fossil localities of northern England, making it highly desirable for collectors of British ammonites.
Scientific Classification
- Kingdom: Animalia
- Phylum: Mollusca
- Class: Cephalopoda
- Order: Ammonitida
- Superfamily: Stephanoceratoidea
- Family: Stephanoceratidae
- Genus: Gulielmiceras
- Species: Gulielmiceras gulielm
Members of the family Stephanoceratidae are important index fossils within the Jurassic, helping geologists to subdivide the Callovian into more precise biozones.
Morphological Features
Gulielmiceras gulielm is characterized by its involute shell with prominent ribbing across the flanks. The ribs are typically strong and may curve slightly forward as they approach the venter, producing a visually striking ornamentation. The shell whorls are compact and tightly coiled, and the venter often shows continuous rib development without interruption. These features make this species instantly recognizable and particularly attractive as a display piece.
The robust shell and detailed ribbing reflect its adaptation to the Jurassic seas, where ammonites were agile swimmers and active predators. The preservation of this specimen highlights these traits, allowing collectors to appreciate both the beauty and scientific value of the fossil.
Paleoenvironment and Significance
During the Callovian, much of Yorkshire was submerged beneath shallow, warm marine environments connected to the epicontinental seas of Europe. These seas were rich in marine life, providing the perfect conditions for ammonites such as Gulielmiceras to flourish. The Kellaways Beds, in particular, are known for their fine-grained sediments that allowed for the preservation of ammonite shells in remarkable detail.
Ammonites like Gulielmiceras gulielm play a crucial role as biostratigraphic markers, enabling geologists to establish accurate correlations between rock layers in different regions. Their distinctive morphology and evolutionary significance make them indispensable to paleontological research.
Collector and Display Value
This 4.5″ Gulielmiceras gulielm ammonite fossil is not only scientifically important but also a striking piece for display. Its size, preservation, and provenance from a well-known Jurassic site in Yorkshire make it a centerpiece specimen for any collection. With its natural beauty and robust form, it appeals equally to dedicated fossil enthusiasts, geologists, and those seeking a unique piece of natural history from Britain’s Jurassic past.
Key Features
- 4.5 inch Gulielmiceras gulielm ammonite fossil from the Lower Callovian.
- Origin: Newbold Quarry, Hull, Yorkshire, UK.
- Distinctive ribbing and classic Jurassic morphology.
- From the Kellaways Beds, a significant Jurassic formation.
- Supplied with a Certificate of Authenticity.
This Gulielmiceras gulielm ammonite is a rare opportunity to own a genuine and scientifically significant Jurassic fossil from one of Britain’s most important geological formations.
Reviews
There are no reviews yet.