Description
Rare Hoplites baylei Ammonite Fossil from France
This listing offers a rare Hoplites baylei ammonite fossil, originating from the Albian Stage of the Lower Cretaceous, Courcelles, Troyes, Aube, France. At over 100 million years old, this specimen is a genuine relic from a world dominated by ammonites and marine reptiles. Each fossil we supply is hand-selected and comes with a Certificate of Authenticity, ensuring both scientific and collector’s value. The photographs provided show the exact specimen you will receive, with a 1 cm scale cube for accurate sizing reference.
Geological Context: Albian Stage of the Cretaceous
The Albian Stage (113–100 million years ago) is a critical interval in Earth’s history, marking a period of significant evolutionary change within the ammonite lineage. During this time, Western Europe, including present-day France, was covered by shallow epicontinental seas. These marine environments were rich in life and provided the perfect depositional conditions for fossilisation.
The Hoplites genus, and specifically Hoplites baylei, is one of the most important ammonite groups from the Albian, frequently used as an index fossil for biostratigraphic studies. Its restricted stratigraphic range and distinct morphology make it invaluable in defining the Hoplites baylei Zone, a key subdivision of the Albian biozonation.
Scientific Classification
- Fossil Type: Ammonite
- Genus: Hoplites
- Species: baylei
- Order: Ammonitida
- Superfamily: Hoplitaceae
- Family: Hoplitidae
- Geological Age: Albian Stage, Lower Cretaceous (113–100 million years ago)
- Locality: Courcelles, Troyes, Aube, France
Morphological Features of Hoplites baylei
The Hoplites baylei ammonite displays a set of distinctive features which make it both scientifically significant and highly collectible:
- Thick, evolute shell with a strong, robust appearance.
- Prominent ribbing radiating across the flanks, with ribs often bifurcating or branching towards the outer whorl.
- Well-developed tubercles positioned at the rib intersections, giving the shell a spiny or ornamented texture.
- Ventral keel with strong rib termination, characteristic of the genus Hoplites.
- Ornamentation and ribbing patterns that aid in rapid identification and correlation across stratigraphic sections.
This combination of traits reflects adaptation to an active nektonic lifestyle, with hydrodynamic efficiency suited to the open seas.
Paleoecology and Depositional Environment
Ammonites such as Hoplites baylei were nektonic carnivores, actively swimming in the mid to upper water column, preying on small crustaceans, molluscs, and plankton. Their shell structure, with internal chambers regulating buoyancy, enabled efficient navigation of the shallow Albian seas.
The Courcelles region in France represents a classic Albian fossil locality, known for its Gault Clay and associated marine deposits. These fine sediments were deposited in a calm marine environment, enhancing fossil preservation and allowing the survival of beautifully detailed specimens like this one.
Collector and Display Significance
Hoplites baylei is a stratigraphically important ammonite, named after the renowned palaeontologist Bayle, who contributed to the formal identification of the species in the 19th century. Its association with the Albian Hoplites baylei Zone makes it a prized specimen for collectors interested in biostratigraphy and ammonite evolution.
For private collectors, museums, and educators, this fossil holds dual appeal—its scientific importance in defining a key Albian biozone, and its aesthetic beauty with robust ribbing and tuberculation. Its rarity and provenance from a renowned French locality add further value, making it a highlight in any collection.
Key Details
- Species: Hoplites baylei
- Age: Albian Stage, Lower Cretaceous (113–100 million years ago)
- Location: Courcelles, Troyes, Aube, France
- Features: Thick shell, strong ribbing, distinct tubercles, keel
- Authenticity: 100% genuine fossil with Certificate of Authenticity
- Exact Specimen: You will receive the fossil shown in the photographs
- Scale: 1 cm reference cube shown for size accuracy
This rare Hoplites baylei ammonite fossil from France is a scientifically significant and visually striking specimen, making it an outstanding addition to any fossil collection.
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