Description
AMONOCERATITES lamarcki Fossil Ammonite – Aptian Stage, Early Cretaceous, Madagascar
This elegant ammonite fossil belongs to the species Amonoceratites lamarcki, an extinct marine cephalopod that lived during the Aptian stage of the Early Cretaceous, approximately 125 to 113 million years ago. Sourced from the fossil-rich beds of Madagascar, this specimen is a fine example of coiled cephalopod evolution and preservation.
Fossil Type & Species:
- Type: Invertebrate Fossil (Ammonite Shell)
- Species: Amonoceratites lamarcki
- Order: Ammonitida
- Suborder: Ancyloceratina
- Superfamily: Ancyloceratoidea
- Family: Ancyloceratidae (tentative classification)
- Described by: Pictet & Campiche, mid-19th century (species-level assignment may vary by source)
Geological & Stratigraphic Details:
- Origin: Madagascar (likely Mahajanga or Antsiranana Basin)
- Formation: Marine limestone or marl from Cretaceous deposits
- Geological Stage: Aptian (Early Cretaceous)
- Age: ~125–113 million years ago
- Biozone: Aptian ammonite-bearing strata, specific zonation not assigned
- Depositional Environment: Shallow marine platform with fine sedimentation ideal for the preservation of delicate ammonite shells
Morphology & Features: This Amonoceratites lamarcki specimen displays distinctive features:
- Planispiral coiling with moderately involute whorls
- Fine ribbing along the shell flanks with gentle ornamentation
- Tapered venter and visible suture lines, depending on preservation
- Fossilised in earthy browns, beiges, or polished to enhance the inner chamber structure
Notable: Amonoceratites is a genus prized for its balanced spiral geometry and often ornate, ribbed shell structure. Though less well-known than other Madagascan ammonites, lamarcki specimens provide critical insight into ammonoid diversity and morphological transition in the Early Cretaceous.
Specimen Details:
- Origin: Madagascar
- Species: Amonoceratites lamarcki
- Fossil Type: Ammonite Shell (Invertebrate)
- Geological Stage: Aptian, Early Cretaceous
- Size Reference: Scale rule square = 1cm (see photo for full sizing)
- Note: The specimen in the photo is the exact fossil you will receive
Authenticity & Quality: This is a 100% genuine fossil. Each specimen is hand-selected and comes with a Certificate of Authenticity. No reconstructions or artificial enhancements are applied.
Why Choose This Fossil? This ammonite is ideal for:
- Collectors of Madagascan ammonites
- Natural history and evolution enthusiasts
- Unique geological decor
- Fossil education and science learning tools
Shipping & Packaging: All fossils are shipped securely using eco-conscious, protective packaging. Fast, tracked shipping ensures your specimen arrives in excellent condition.
Own a beautifully preserved Amonoceratites lamarcki ammonite fossil and explore the ancient marine world of the Early Cretaceous.
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
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