Sphaeroceras cf. auritum Ammonite Fossil Dorset UK with COA

Description

Genuine Strenoceras Ammonite Fossil

This genuine fossil ammonite is identified as Sphaeroceras cf. auritum and comes from the Bajocian at Oborne Wood, North Dorset, UK. It is an attractive and scientifically interesting Jurassic fossil for collectors, geological displays, teaching collections, or anyone fascinated by the ancient seas that once covered Britain. The photographs show the exact specimen offered for sale, so the fossil you see is the fossil you will receive.

The abbreviation “cf.” means that the specimen compares closely with Sphaeroceras auritum. This is a careful palaeontological identification used when the preserved features support comparison with a named species but do not justify an entirely definitive species assignment. The genus identification and detailed locality information still give this piece excellent value as a documented example of a characteristic Bajocian ammonite.

Geological Age and Biozone

This ammonite is from the Bajocian, a subdivision of the Middle Jurassic Period. The Bajocian records a time when ammonites were diverse and rapidly evolving in warm marine environments. Because many ammonite groups changed through time, their shells are especially useful to geologists for comparing and dating marine rock sequences.

The documented Bajocian age and Oborne Wood provenance give the specimen useful stratigraphic and locality context. This makes it more than a decorative fossil: it is a tangible record of a recognised interval within the Jurassic succession and a documented Dorset collecting area.

Ammonite Form and Preservation

Sphaeroceras ammonites are recognised by their compact coiling, rounded inflated form, and distinctive ornamentation. On this specimen, examine the photographs carefully for the visible whorls, ribbing, growth pattern, and natural mineral texture preserved in the rock. These features reflect the original shell architecture of an extinct marine cephalopod. Ammonites lived in the sea and were related to living cephalopods such as squid, cuttlefish, and nautiluses, although they represent their own extinct branch of the group.

The shell was divided internally into chambers as the animal grew. The living animal occupied the final body chamber, while older chambers helped with buoyancy control. Where preservation allows, the coiling and ornamentation provide important evidence used in ammonite classification. Natural breaks, matrix, colour variation, and surface texture are part of the specimen’s geological history rather than modern manufacturing.

Oborne Wood, North Dorset

Oborne Wood in North Dorset is known among fossil collectors for Jurassic material preserved within marine sedimentary rocks. During the Bajocian, this area formed part of an ancient marine setting where shells and other biological remains could be buried in sediment and preserved over immense spans of time. The locality information links the specimen to the well-studied Jurassic geology of southern England and adds meaningful provenance for a regional or stratigraphic collection.

Exact Specimen, Size and Authenticity

Please use the full sizing shown in the photographs, which provide the best scale and detail for this individual fossil. The images are not stock photographs. They show the actual Sphaeroceras cf. auritum ammonite specimen that will be supplied.

This fossil is a genuine specimen and includes a generic Certificate of Authenticity card with a lifetime guarantee. It has been carefully selected for its combination of identifiable ammonite form, locality data, Bajocian age, and Oborne Wood provenance. It makes a distinctive natural-history collectible, an educational Jurassic fossil, or a thoughtful gift for an ammonite enthusiast.