Description
Genuine Dorsetensia romani Ammonite Fossil
This listing is for a genuine Dorsetensia romani ammonite fossil from the Inferior Oolite Group at Milborne Wick, Dorset, UK. Dating from the Bajocian Stage of the Middle Jurassic, specifically the Romani Subzone, this specimen represents a classic British Jurassic ammonite from one of the most important ammonite-bearing intervals in southern England.
Dorsetensia romani is a desirable and scientifically interesting ammonite species, valued for its named identification, precise stratigraphic association, and connection with the richly fossiliferous Middle Jurassic marine rocks of Dorset. This fossil is a carefully chosen piece, and the photograph shows the actual specimen you will receive. Full sizing can be seen in the photo.
Geology, Age and Dorset Locality
This ammonite comes from the Inferior Oolite Group, a major Middle Jurassic geological unit found across parts of Dorset and southern England. The Inferior Oolite is made up of limestones, sandy limestones, marls, shell beds, iron-rich layers, and oolitic sediments deposited in warm, shallow marine environments.
The fossil is Bajocian in age, approximately 170 to 168 million years old. The Bajocian was an important stage in ammonite evolution, with many distinctive ammonite groups appearing and diversifying across the shallow seas of Europe. Ammonites from this interval are highly important in geology because their rapid evolution allows rock layers to be dated and correlated with precision.
Milborne Wick and the Romani Subzone
Milborne Wick, in Dorset, is associated with fossil-bearing Middle Jurassic deposits of the Inferior Oolite Group. Fossils from this area are especially appealing to collectors of British ammonites because they preserve part of the rich marine fauna that lived in the warm Jurassic seas of southern England.
This specimen is recorded from the Romani Subzone, a refined ammonite biostratigraphic division within the Bajocian. Subzones are used by palaeontologists to divide geological time into narrower intervals based on characteristic ammonite faunas. A fossil with this level of locality and horizon detail has added scientific and collector value, as it links the specimen to a specific part of the Middle Jurassic ammonite succession.
Dorsetensia romani is particularly associated with this part of the Bajocian record, making it a fitting and well-provenanced example for collectors who appreciate accurately labelled fossils with clear geological context.
Fossil Type and Species Details
Dorsetensia romani was an ammonite, an extinct marine mollusc belonging to the cephalopod group. Ammonites are related to modern squid, cuttlefish, octopus, and nautilus, although ammonites themselves became extinct at the end of the Cretaceous Period. Like other ammonites, Dorsetensia had a coiled external shell divided internally into chambers. The living animal occupied the final body chamber, while the earlier chambers helped regulate buoyancy as it moved through the Jurassic sea.
The genus Dorsetensia is a characteristic Middle Jurassic ammonite group named from Dorset and linked with Bajocian marine faunas. Dorsetensia ammonites typically show planispiral coiling, defined whorl development, and ribbed ornament that can vary with growth stage and preservation. These features give the shell both visual appeal and scientific importance.
Scientific classification places Dorsetensia within Phylum Mollusca, Class Cephalopoda, Subclass Ammonoidea, Order Ammonitida, Superfamily Hammatoceratoidea, and Family Sonniniidae. Its relationship with other Bajocian ammonites makes it useful for understanding Middle Jurassic ammonite diversity, evolution, and biostratigraphy.
Middle Jurassic Marine Environment
During the Bajocian, the area now known as Dorset lay beneath warm, shallow seas on the margin of an ancient European marine shelf. The Inferior Oolite Group records these conditions through carbonate-rich sediments, oolitic limestones, shell-rich beds, and marine muds. These environments supported a diverse ecosystem of ammonites, belemnites, bivalves, brachiopods, gastropods, echinoids, crustaceans, fish, and marine reptiles.
Dorsetensia romani would have lived within this marine setting as part of the active cephalopod fauna. Its chambered shell helped control buoyancy, allowing the animal to move through the water column while feeding and avoiding predators. Ammonites such as Dorsetensia are among the most recognisable fossils from the Jurassic Period and remain highly valued for both display and educational purposes.
Collectible British Jurassic Ammonite
This Dorsetensia romani ammonite fossil is an excellent specimen for collectors interested in British fossils, Dorset geology, Middle Jurassic ammonites, Inferior Oolite fossils, Bajocian biostratigraphy, and scientifically labelled natural history specimens. Its Milborne Wick locality, Romani Subzone attribution, named species identification, and classic ammonite form give it strong collector and educational appeal.
This fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. The photograph shows the actual fossil you will receive, making this a carefully selected and accurately represented specimen from the Middle Jurassic marine deposits of Milborne Wick, Dorset, UK.
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