Description
Genuine Proplanulites koenigi Ammonite Fossil
This genuine Proplanulites koenigi ammonite fossil comes from France and dates to the Middle Callovian of the Middle Jurassic. It is a carefully chosen marine fossil specimen representing an extinct ammonite from the warm Jurassic seas that once covered large parts of western Europe. Ammonites were shelled cephalopods related to modern squid, octopus and nautilus, and they are among the most important fossil groups for understanding, dating and comparing ancient marine rock layers.
This fossil is a genuine specimen and 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, giving collectors confidence that the piece photographed is the exact fossil being offered.
Middle Callovian Jurassic Geology
The Callovian is a stage of the Middle Jurassic Period, dating to approximately 166.1 to 163.5 million years ago. The Middle Callovian represents an important interval within this stage, when much of Europe was covered by shallow to moderately deep marine seas. These seas formed broad seaways across what is now France, creating ideal conditions for the deposition of limestone, marl, clay-rich sediment and shell beds.
During this time, marine life was diverse and abundant. Ammonites, belemnites, bivalves, brachiopods, gastropods, echinoids, crustaceans, fish and marine reptiles all formed part of the Jurassic ecosystem. Fossils from Callovian deposits are especially valued because ammonites from this stage are highly useful for biostratigraphy, allowing geologists to divide and compare rock layers using distinctive ammonite forms.
Proplanulites koenigi Species Detail
Proplanulites koenigi is a Middle Jurassic ammonite associated with the Callovian seas of Europe. The genus Proplanulites belongs to the order Ammonitida and is generally associated with the family Perisphinctidae, a major Jurassic ammonite family known for ribbed, coiled shells and strong stratigraphic value. Perisphinctid ammonites are among the classic ammonites of the Middle and Late Jurassic, and their shell forms are highly recognisable to collectors.
The species Proplanulites koenigi is especially linked with the Koenigi horizon or Koenigi ammonite interval within the Callovian, giving the fossil added geological interest. Named ammonite species such as this are particularly collectable because they represent a defined part of Jurassic cephalopod diversity rather than an unidentified ammonite form.
Ammonite Morphology and Fossil Features
Proplanulites koenigi typically displays a planispirally coiled shell with visible whorls and ribbed ornament. Like many perisphinctid ammonites, it may show an evolute shell form, where the inner coils remain visible rather than being completely covered by the outer whorl. This gives the fossil the classic spiral ammonite appearance that is so popular with collectors.
The ribs on Proplanulites ammonites may cross the shell flanks and sometimes divide or vary as the animal grew. These natural shell features are important for identification and also add strong visual appeal. Depending on preservation, this specimen may show the natural whorl shape, rib pattern, chamber detail, internal mould features, shell surface texture or surrounding Jurassic matrix.
Like all ammonites, Proplanulites koenigi had a chambered shell. The living animal occupied the final outer body chamber, while the earlier chambers helped regulate buoyancy in the water column. The complex suture lines between chambers are one of the key scientific features of ammonites and are part of what makes them so important in palaeontology.
Ancient Jurassic Marine Environment
This ammonite lived in a warm Middle Jurassic sea, moving through the water as an active cephalopod. Proplanulites koenigi would have fed as a predator or scavenger, using its shell for buoyancy control while sharing the sea with other ammonites, belemnites, bivalves, brachiopods, echinoids, gastropods, fish and other marine animals.
After death, the ammonite shell settled onto the sea floor and became buried by sediment. Over millions of years, mineral-rich water and geological pressure transformed the shell and surrounding sediment into stone. The resulting fossil is a natural record of the marine world that existed during the Middle Callovian, preserving part of an ancient ecosystem from the Jurassic seas of France.
Collectable French Callovian Ammonite
This Proplanulites koenigi ammonite fossil is an excellent addition to any collection of Jurassic fossils, French fossils, Callovian ammonites, cephalopods, marine invertebrates or natural history specimens. Its Middle Jurassic age, named species identification and classic ribbed ammonite form make it suitable for display, study or educational use.
Supplied with a Certificate of Authenticity lifetime guarantee generic card, this genuine Proplanulites koenigi ammonite from France is a collectable example of Middle Callovian marine life and a fine representative of Jurassic ammonite diversity.
Reviews
There are no reviews yet.