Description
Anagaudryceras cf. limatum Ammonite Fossil – Upper Cretaceous Marine Fossil from Hokkaido, Japan
This genuine Anagaudryceras cf. limatum ammonite fossil comes from the Campanian Stage of the Upper Cretaceous at Nakagawa-chō, Hokkaido, Japan. It is a carefully chosen fossil specimen, with the photo showing the actual piece you will receive. Full sizing can be seen in the photo. This authentic fossil also includes a Certificate of Authenticity lifetime guarantee generic card, making it a highly appealing specimen for collectors of Japanese ammonites, Cretaceous fossils, marine fossils and natural history display pieces.
Geology and Age
This ammonite dates to the Campanian Stage of the Upper Cretaceous Period, a time when ammonites remained diverse and widespread in the world’s oceans. The Campanian belongs to the later part of the Cretaceous, before the final Maastrichtian stage and before the end-Cretaceous extinction event that brought the ammonites to an end.
Nakagawa-chō in Hokkaido is one of Japan’s most important regions for Cretaceous ammonites. The fossil-bearing marine rocks of Hokkaido represent ancient sea-floor environments along the north-western Pacific margin. During the Late Cretaceous, this area was covered by marine waters in which ammonites, bivalves, gastropods, fish and other sea life lived, died and were gradually preserved within sediment.
Hokkaido ammonites are especially valued by collectors because of their distinctive provenance and the rich diversity of species found in the region. Fossils from these deposits provide an excellent window into the marine ecosystems of Late Cretaceous Japan, when the seas supported a wide variety of cephalopods and other invertebrate life.
Fossil Type and Identification
This specimen is identified as Anagaudryceras cf. limatum. The use of “cf.” means the fossil compares closely with Anagaudryceras limatum, while allowing for careful identification where preservation, natural variation or incomplete diagnostic features make an exact species assignment cautious. This is commonly used in palaeontology and is particularly appropriate for ammonites, where shell shape, ribbing, whorl section and suture details are all important for classification.
Anagaudryceras is a genus of ammonite belonging to the order Ammonitida. It is generally associated with the family Gaudryceratidae and superfamily Tetragonitoidea. Members of this group are known from Cretaceous marine deposits and are often admired for their refined shell form, fine ornament and attractive coiling.
Ammonites were extinct marine cephalopods, related to modern squid, cuttlefish and nautilus. They possessed coiled, chambered shells, with the living animal occupying the outer body chamber. Earlier internal chambers helped regulate buoyancy, allowing the ammonite to move through the water column in ancient seas.
Morphology and Natural Features
Anagaudryceras ammonites are typically recognised by their planispiral coiling, rounded whorl form and fine, regular ornamentation. Many specimens show delicate ribs or growth lines that follow the curve of the shell, giving the fossil an elegant and highly collectible appearance. The shell form is generally balanced and classic, making this genus popular among collectors of Cretaceous ammonites.
The internal shell structure would originally have been divided by septa, creating a series of chambers. The junction between these internal walls and the outer shell produced suture lines, which are important in ammonite classification. In well-preserved Cretaceous ammonites, these sutures may be highly complex, reflecting the advanced shell architecture of the group.
As a living animal, Anagaudryceras cf. limatum would have been part of a thriving marine ecosystem. It likely lived in open marine waters, using its chambered shell for buoyancy control while moving through the sea. Like other ammonites, it would have formed part of the food web as both predator and prey, sharing its environment with fish, marine reptiles and a wide variety of invertebrates.
Collector Appeal
An Anagaudryceras cf. limatum ammonite from Nakagawa-chō, Hokkaido is a desirable fossil for collectors who appreciate Japanese ammonites, Upper Cretaceous fossils and specimens with strong geological context. Hokkaido ammonites are highly sought after due to their scientific interest, attractive preservation and association with one of Asia’s most famous Cretaceous fossil regions.
This fossil would make an excellent addition to a fossil cabinet, ammonite collection, educational display, geology classroom or natural history collection. Its Campanian age places it within the final great period of ammonite evolution, making it particularly interesting for collectors building a display around Cretaceous marine life.
Authenticity and Presentation
This is a genuine fossil specimen and includes a Certificate of Authenticity lifetime guarantee generic card for buyer confidence. The fossil has been carefully selected, and the listing photograph shows the actual specimen you will receive, allowing buyers to view its natural preservation, individual character and display quality before purchase.
This authentic Upper Cretaceous Anagaudryceras cf. limatum ammonite fossil from Nakagawa-chō, Hokkaido, Japan is ideal for fossil collectors, ammonite enthusiasts, geology displays and anyone seeking a genuine piece of prehistoric marine life.
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