Rare Melchiorites falcistriatus Heteromorph Ammonite Fossil Cretaceous Albian Madagascar Genuine Certified Specimen | Collector Fossil

Description

Authentic Melchiorites falcistriatus Ammonite Fossil from Madagascar

This exceptional specimen is a Melchiorites falcistriatus heteromorph ammonite fossil from the Albian Stage of the Cretaceous Period (approximately 113–100 million years ago). It originates from Mitsinjo, Madagascar, a locality renowned for producing beautifully preserved and scientifically important ammonites. Each fossil we offer is guaranteed 100% genuine, comes with a Certificate of Authenticity, and the piece pictured is the exact specimen you will receive. The 1 cm scale cube in the photographs provides an accurate size reference for the fossil.

Geological Age and Depositional Environment

The Albian Stage, part of the Lower Cretaceous, was a time of significant global change with extensive shallow seas covering large parts of the continents. Ammonites flourished in these environments, and the deposits of Madagascar capture this biodiversity in extraordinary detail. Mitsinjo, situated in the Mahajanga Basin, is particularly well known for yielding heteromorph ammonites, belemnites, and other marine fossils preserved within fine-grained marine sediments. These conditions allowed intricate shell features and suture patterns to be preserved for millions of years.

Fossil Type and Classification

Ammonites were cephalopods within the order Ammonitida, related to modern squids and octopuses. The genus Melchiorites, and specifically the species Melchiorites falcistriatus, belongs to the family Ancyloceratidae and the superfamily Ancyloceratoidea. These ammonites are heteromorphs, meaning they exhibit unusual shell coiling and shapes compared to the more familiar planispiral forms. Their distinctive morphology makes them important for understanding evolutionary adaptations during the Cretaceous and also valuable as index fossils for stratigraphic correlation.

Morphology and Distinguishing Features

Unlike the classic spiral form of many ammonites, heteromorph ammonites such as Melchiorites falcistriatus are characterised by their uncoiled or irregularly coiled shells. This specimen displays falcate ribbing, strong ornamentation, and irregular coiling that gives the fossil its unique appearance. The ribs and suture lines are well-defined, providing excellent diagnostic features for species identification. These heteromorph forms are thought to have occupied specialised ecological niches within the Cretaceous seas, possibly with different swimming abilities and buoyancy compared to more typical ammonites.

Scientific and Collector Significance

Melchiorites falcistriatus holds particular significance in the study of Early Cretaceous ammonite faunas. The unusual morphology of heteromorph ammonites provides key insights into evolutionary experimentation and adaptation during this dynamic interval of Earth’s history. As an index fossil, the species is also useful in refining the biostratigraphy of the Albian Stage. For collectors, a heteromorph ammonite of this calibre represents not only a scientific specimen but also an eye-catching display fossil. Its rarity and provenance from Madagascar add further value, making it both a scientifically important and aesthetically striking piece.

Provenance and Authenticity

• Species: Melchiorites falcistriatus
• Fossil Type: Heteromorph ammonite
• Geological Stage: Albian, Early Cretaceous (c. 113–100 million years ago)
• Location: Mitsinjo, Madagascar
• Family: Ancyloceratidae
• Superfamily: Ancyloceratoidea
• Order: Ammonitida
• Notable Features: Uncoiled heteromorph shell, falcate ribbing, distinct ornamentation
• Authenticity: 100% genuine fossil with Certificate of Authenticity
• Photographs: Exact specimen shown with 1 cm scale cube for size reference

A Carefully Chosen Fossil

This specimen has been carefully selected for its exceptional preservation, scientific interest, and display appeal. The fossil you see in the photographs is the precise one you will receive, ensuring complete transparency in what you are purchasing. Each fossil is backed by a Certificate of Authenticity, confirming its identification and provenance.

This rare Melchiorites falcistriatus heteromorph ammonite fossil from Mitsinjo, Madagascar is a remarkable collector’s piece, combining geological significance, evolutionary importance, and striking natural beauty in a single specimen.