Description
Genuine Derolytoceras tortum Ammonite Fossil from Germany
A genuine Derolytoceras tortum ammonite fossil from Germany, dating to the Lower Jurassic, Upper Pliensbachian. This attractive European Jurassic ammonite is a carefully chosen specimen, with the photograph showing the actual fossil you will receive. It includes a Certificate of Authenticity lifetime guarantee generic card, making it a well-documented piece for fossil collectors, natural history displays, educational collections, and anyone interested in ancient marine life.
Derolytoceras is a desirable Lower Jurassic ammonite genus with strong scientific and collector interest. Fossils from the Upper Pliensbachian represent a time when ammonites were widespread and diverse in the ancient seas of Europe, making this specimen an appealing example of Early Jurassic cephalopod life.
Fossil Type and Species Information
Derolytoceras tortum is an ammonite, an extinct marine cephalopod related to modern squid, cuttlefish, octopus, and nautilus. Ammonites lived in ancient oceans and possessed coiled, chambered shells. The animal occupied the outer body chamber, while the internal chambers helped control buoyancy as it moved through the water column.
Derolytoceras belongs to the ammonite group commonly associated with lytoceratid-style forms, which are known for elegant coiling and comparatively fine shell ornamentation. Depending on preservation, specimens may show rounded whorls, ribbing, curved growth lines, and the characteristic spiral shell form that makes ammonites instantly recognisable. The species tortum is especially collectable as a named fossil species from the Lower Jurassic.
Ammonites such as Derolytoceras are highly valued in palaeontology because they evolved rapidly and were widely distributed across ancient seas. This makes them important index fossils, helping geologists date and correlate Jurassic rock layers between different regions.
Lower Jurassic Upper Pliensbachian Age
This fossil dates to the Upper Pliensbachian stage of the Lower Jurassic, approximately 184 to 190 million years old. During this time, large areas of what is now Europe were covered by shallow to moderately deep epicontinental seas. These warm marine environments supported a wide variety of life, including ammonites, belemnites, bivalves, brachiopods, gastropods, crinoids, fish, and marine reptiles.
The Upper Pliensbachian was an important interval in ammonite evolution, with many distinctive genera and species appearing in marine sediments. Fossils from this period provide a fascinating window into Early Jurassic ecosystems and the changing conditions of ancient European seas.
Geology and Ancient Marine Environment
German Lower Jurassic deposits are well known for producing beautifully preserved marine fossils. During the Pliensbachian, fine sediments accumulated on the seabed, gradually burying shells and other remains. Over millions of years, these sediments were compacted and lithified, while the buried shells became mineralised as fossils.
The marine environment that produced Derolytoceras tortum would have been part of a broad Jurassic seaway. Ammonites moved through the water column, while belemnites, fish, and other marine organisms formed part of the same ecosystem. When ammonite shells sank to the seabed after death, they could be covered by sediment and preserved, retaining details of their shell shape and ornamentation.
Morphology and Collector Appeal
Derolytoceras tortum is admired for its classic ammonite form and refined Jurassic character. The coiled shell structure reflects a complex internal chamber system, with each chamber separated by walls known as septa. In well-preserved ammonites, these chambers and shell features provide insight into the animal’s life and growth.
This specimen is suitable for display in a fossil cabinet, study, classroom collection, museum-style display, or natural history collection. Its combination of named species, Lower Jurassic age, Upper Pliensbachian stratigraphy, and German provenance gives it strong collector appeal. It is also an excellent choice for anyone building a collection of European ammonites, Jurassic fossils, or scientifically labelled cephalopod specimens.
Authenticity and Specimen Details
This is a genuine Derolytoceras tortum ammonite fossil from the Lower Jurassic, Upper Pliensbachian, collected from Germany. It includes a Certificate of Authenticity lifetime guarantee generic card.
Full sizing can be seen in the photo. The fossil shown is the actual carefully chosen specimen you will receive, allowing buyers to view the true scale, preservation, shape, and presentation of this authentic Jurassic ammonite.
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