Macrocephalites macrocephalus Ammonite Fossil Jurassic Madagascar Genuine Authentic COA

Description

Authentic Jurassic Fossil from Madagascar

This fine Macrocephalites macrocephalus ammonite fossil is a genuine specimen from the Lower Callovian stage of the Middle Jurassic, discovered in Madagascar. Carefully selected for its excellent preservation and distinct ribbing, it represents a scientifically important ammonite species that lived over 165 million years ago. The photographs show the actual specimen you will receive, with a 1 cm scale cube provided for accurate sizing. Each fossil is supplied with a Certificate of Authenticity, confirming that it is 100% genuine.

Geological Age and Provenance

This ammonite originates from the Lower Callovian stage of the Middle Jurassic, approximately 166–163 million years ago. Madagascar during this time was part of the ancient supercontinent Gondwana, with large areas submerged under warm shallow seas. These epicontinental waters provided excellent conditions for the development of diverse marine life, and the fine marine sediments deposited here created ideal conditions for fossil preservation. Madagascar’s Jurassic deposits are world-famous for producing ammonites of extraordinary scientific and aesthetic value, such as this Macrocephalites macrocephalus.

Species Identification and Classification

Macrocephalites macrocephalus belongs to the class Cephalopoda, order Ammonitida, superfamily Stephanoceratoidea, and family Macrocephalitidae. The genus Macrocephalites is well recognised for its large, robust shells and strong ribbing patterns, which make them among the most distinctive ammonites of the Callovian stage. The species macrocephalus is a significant component of Lower Callovian ammonite faunas, and its presence is used by paleontologists to define and correlate specific biozones within Jurassic stratigraphy.

Morphology and Distinctive Traits

This specimen clearly demonstrates the diagnostic features of Macrocephalites macrocephalus. The shell is large and planispiral, with compressed whorls that overlap significantly, giving the fossil a compact appearance. Strong, well-defined ribs sweep across the shell flanks, often bifurcating near the outer whorl. These ribs provide structural strength and aesthetic beauty, making the fossil both scientifically valuable and visually striking. The compressed form and robust ornamentation reflect adaptations for survival in Jurassic marine environments, ensuring both buoyancy and shell durability.

Scientific and Stratigraphic Importance

Macrocephalites macrocephalus is an important ammonite species for stratigraphy, as it serves as an index fossil for the Lower Callovian. Its occurrence in Madagascar and other Jurassic localities across the world allows geologists to date and correlate rock layers with great precision. This makes the species central to the construction of the Jurassic timescale and the reconstruction of marine ecosystems. For collectors, owning a specimen of macrocephalus is to hold a fossil that has been pivotal to paleontological research for generations.

Condition and Presentation

This fossil has been professionally prepared to showcase its natural features while preserving its authenticity. The ribbing, whorl structure, and compressed shell form are sharply preserved, allowing the diagnostic traits of the species to be appreciated in detail. It is a one-of-a-kind specimen—not a replica or reproduction. The photographs provided are of the exact ammonite you will receive, ensuring full transparency and buyer confidence.

Guarantee of Authenticity

All of our fossils are 100% genuine, responsibly sourced, and scientifically identified. Each specimen comes with a Certificate of Authenticity. This rare Macrocephalites macrocephalus ammonite fossil from Madagascar is a scientifically significant and visually impressive piece of Jurassic natural history, making it a superb addition for fossil collectors, natural history enthusiasts, and educational displays.