Description
Genuine Sonninia cf. ohmerti Ammonite Fossil from Sherborne, Dorset
This Sonninia cf. ohmerti ammonite fossil is a genuine Middle Jurassic specimen from the Inferior Oolite Group at Redhole Lane, North Sherborne, Dorset, UK. Dating from the Lower Bajocian Stage, this carefully chosen fossil represents a classic Jurassic marine cephalopod from the warm shallow seas that once covered southern Britain. It is an attractive natural history specimen with strong geological interest, collector appeal and a desirable Dorset fossil locality.
The photograph shows the actual fossil you will receive, making this an individual specimen rather than a stock image or representative example. For full sizing and visible condition, please see the listing photo. This fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card.
Fossil Type and Species Interest
Sonninia cf. ohmerti is an ammonite, an extinct marine cephalopod related to modern squid, cuttlefish and nautilus. Ammonites lived within coiled external shells divided into a series of internal chambers. These chambers helped regulate buoyancy in the water column, while the soft-bodied animal occupied the final living chamber at the front of the shell.
The “cf.” in the name indicates that this fossil compares closely with Sonninia ohmerti. This wording is commonly used when a specimen shows strong similarity to a known species while allowing for natural variation or preservation differences. Sonninia is an important Middle Jurassic ammonite genus, especially associated with Bajocian marine deposits and classic Inferior Oolite faunas.
Sonninia ammonites are known for their distinctive coiled shells, often with a moderately compressed form, visible ribbing and a ventral keel or sharpened outer edge depending on preservation. Many examples show ribs that sweep across the whorls, giving the shell a dynamic and elegant Jurassic appearance. These features make Sonninia ammonites appealing to collectors who appreciate both natural form and scientific detail.
As an ammonite, Sonninia belongs to the order Ammonitida and is associated with the superfamily Hammatoceratoidea. Ammonites are especially valuable in palaeontology because they evolved rapidly, were abundant in ancient seas and spread widely across marine environments. This makes them important index fossils for comparing and dating rock layers.
Geology, Age and Inferior Oolite Group
This fossil comes from the Inferior Oolite Group, a well-known Middle Jurassic rock unit famous for fossil-rich limestones, oolitic sediments and diverse marine invertebrate faunas. The Lower Bajocian represents an important interval in Jurassic marine history, when warm shallow seas covered much of what is now southern England.
The term oolite refers to limestone made partly from small rounded carbonate grains called ooids. These formed in warm, moving shallow marine waters where calcium carbonate built up around tiny particles on the sea floor. Over time, these sediments became compacted and cemented into limestone, preserving the remains of ammonites, belemnites, brachiopods, bivalves, gastropods, echinoids and other marine life.
During the Bajocian, ammonites such as Sonninia were active marine animals, moving through the water using jet propulsion while their chambered shells helped control buoyancy. Their presence in the Inferior Oolite reflects a rich and varied marine ecosystem full of shell-bearing organisms and other Jurassic sea life.
Redhole Lane, North Sherborne Locality
Redhole Lane at North Sherborne in Dorset is associated with fossil-bearing Middle Jurassic deposits and is a desirable locality for collectors of British ammonites. Dorset is one of the UK’s most celebrated fossil regions, with a long geological record and many classic Jurassic fossil sites.
A Sonninia cf. ohmerti ammonite from this locality combines a scientifically interesting fossil type, a defined Lower Bajocian age and a respected British provenance. This makes it a strong addition to collections focused on Dorset fossils, Jurassic ammonites, Inferior Oolite specimens, cephalopods or natural history display pieces.
Authenticity and Presentation
This Sonninia cf. ohmerti ammonite fossil is a genuine specimen selected for its natural character, geological interest and display quality. It is supplied exactly as shown in the listing photograph, so the fossil pictured is the actual piece you will receive.
The included Certificate of Authenticity lifetime guarantee generic card provides reassurance for collectors, educators, gift buyers and natural history enthusiasts. This makes the fossil suitable for a serious fossil collection, educational use or display in a cabinet, study, classroom, office or geology-themed room.
Display, Collecting and Educational Value
This Sonninia cf. ohmerti ammonite is ideal for collectors of British fossils, Jurassic ammonites, Middle Jurassic cephalopods and natural history specimens. Its Lower Bajocian age, Inferior Oolite origin, North Sherborne locality and classic ammonite form give it excellent appeal as both a display fossil and an educational specimen.
As a genuine Middle Jurassic ammonite from Dorset, this fossil offers a direct connection to the ancient marine world that existed millions of years ago. It would make an excellent fossil gift, collector’s item, teaching specimen or display piece for anyone interested in ammonites, cephalopods, palaeontology, British geology and the fossil-rich marine deposits of the Jurassic Period.
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