Calycoceras paucicostatum Ammonite Fossil Cenomanian Cretaceous France Authentic Specimen COA

Description

Calycoceras paucicostatum Ammonite Fossil

This listing features a fine Calycoceras paucicostatum Ammonite Fossil from the Upper Cenomanian stage of the Late Cretaceous, collected in Normandy, France. At approximately 95 million years old, this ammonite represents one of the most scientifically important index species of the Cenomanian. The specimen shown in the photographs is the exact one you will receive, with a 1 cm scale cube included for precise measurement. All of our fossils are 100% genuine and supplied with a Certificate of Authenticity.

Geological Context – Cenomanian of Normandy

The fossil originates from the Upper Cenomanian chalk deposits of Normandy, a region renowned for its excellent exposures of Cretaceous marine strata. During the Cenomanian, high global sea levels created extensive shallow seas across western Europe, linked to the Tethys and North Atlantic Oceans. These warm waters were rich in plankton, molluscs, and other marine organisms, supporting a flourishing ecosystem in which ammonites such as Calycoceras paucicostatum thrived.

The chalk and marl deposits of Normandy are scientifically important as they record key intervals of the Cretaceous, including the Cenomanian–Turonian transition. Fossils from these deposits are widely used in biostratigraphy, providing essential markers for correlating marine sediments across Europe and beyond.

Species Overview – Calycoceras paucicostatum

The specimen is identified as Calycoceras paucicostatum, an ammonite within the order Ammonitida, superfamily Acanthoceratoidea, and family Acanthoceratidae. Members of this genus are known for their moderately evolute shells, prominent ribs, and characteristic tubercles along the ventrolateral margins.

Calycoceras paucicostatum is distinguished by its relatively widely spaced ribs compared to other Calycoceras species. These ribs may bifurcate and often terminate in small nodes or tubercles, giving the shell both strength and a highly distinctive appearance. Its robust ornamentation provided structural reinforcement and may have had hydrodynamic or protective functions.

Paleontological Importance

Calycoceras paucicostatum is one of the most significant index fossils of the Upper Cenomanian. Its clear diagnostic features and narrow stratigraphic range make it invaluable for defining ammonite biozones, which are used globally to establish precise geological correlations.

The species also provides insight into the evolutionary development of the Acanthoceratidae, a family of ammonites that reached peak diversity during the Cretaceous. Its distinctive ribbing and tuberculation are examples of evolutionary adaptations that enabled ammonites to thrive in dynamic Late Cretaceous marine ecosystems.

Normandy, in particular, has yielded many important specimens of Calycoceras paucicostatum, which have been studied by paleontologists to refine the international stratigraphic framework for the Cenomanian stage.

Collector’s and Educational Value

This Calycoceras paucicostatum ammonite fossil is an excellent addition to any collection of Cretaceous fossils. Its provenance from Normandy, France, a classic locality for Upper Cretaceous ammonites, greatly enhances its scientific and collector’s value. The strong ribbing and diagnostic features make it visually striking, suitable for display, while its stratigraphic importance ensures it holds lasting scientific significance.

For educators and students, this ammonite serves as an outstanding teaching specimen, illustrating ammonite morphology, Cretaceous paleoenvironments, and the principles of biostratigraphy.

Guarantee of Authenticity

• 100% genuine Calycoceras paucicostatum ammonite fossil
• Supplied with a Certificate of Authenticity
• The exact specimen shown in the photographs will be sent

This is a rare opportunity to acquire a scientifically important and beautifully preserved Calycoceras paucicostatum Ammonite Fossil from the Upper Cenomanian of Normandy, France, a classic and highly sought-after ammonite from Europe’s Cretaceous chalk seas.