Macrocephalites ornati Ammonite Fossil Jurassic Gruibingen Germany Genuine Authentic COA

Description

Genuine Jurassic Fossil from Germany

This Macrocephalites ornati ammonite fossil is an authentic specimen from the Lower Callovian stage of the Middle Jurassic, discovered near Gruibingen in Germany. Carefully chosen for its quality and scientific value, it provides a striking representation of one of the most important ammonite groups of the Jurassic. The photographs show the actual specimen you will receive, with a 1 cm scale cube provided for accurate sizing. Each specimen is supplied with a Certificate of Authenticity, confirming it is 100% genuine.

Geological Age and Provenance

This ammonite dates back to the Lower Callovian stage of the Jurassic Period, approximately 166–163 million years ago. During this time, southern Germany formed part of a shallow marine environment linked to the Tethys Ocean. Warm epicontinental seas covered much of the region, with fine-grained sediments accumulating across the seabed. These conditions preserved an abundance of marine life, including ammonites, bivalves, gastropods, and marine reptiles. The Jurassic fossil beds of Gruibingen are well-regarded for their scientific importance and for yielding exceptionally preserved ammonite specimens.

Species Identification and Classification

Macrocephalites ornati is classified within the class Cephalopoda, order Ammonitida, superfamily Stephanoceratoidea, and family Macrocephalitidae. The genus Macrocephalites is one of the defining ammonite groups of the Callovian stage. The species ornati is widely recognised as a key index fossil, used by geologists to define and correlate rock layers within the Lower Callovian across Europe. Its distinctive morphology and well-documented stratigraphic range make it both scientifically important and a highly desirable fossil for collectors.

Morphology and Distinctive Traits

This specimen displays the classic features of Macrocephalites ornati. Its shell is planispiral and strongly compressed, with tight coiling that gives it an elegant form. Bold ribs sweep across the flanks, often bifurcating as they extend toward the ventral side, producing a striking ribbed pattern. These ribs provided strength to the shell and enhanced hydrodynamic efficiency, allowing the ammonite to thrive in shallow marine waters. The symmetry, ribbing style, and compressed whorl shape make ornati one of the most visually distinctive ammonites of the Callovian.

Scientific and Stratigraphic Importance

Macrocephalites ornati is an ammonite of major scientific and stratigraphic importance. Its use as an index fossil allows paleontologists to divide the Lower Callovian into precise biozones, enabling the correlation of Jurassic rock layers across wide geographic regions. This has helped build the framework of the Jurassic timescale. Its evolutionary significance within the family Macrocephalitidae also provides insight into cephalopod diversity and adaptation during the Middle Jurassic.

Condition and Presentation

The fossil has been professionally prepared to highlight its natural details. Its ribbing, whorl structure, and overall shell form are all clearly visible. The photographs provided are of the exact specimen you will receive, ensuring complete transparency. This is a one-of-a-kind piece, not a reproduction, making it an outstanding addition for display, scientific study, or teaching purposes.

Guarantee of Authenticity

All of our fossils are 100% genuine, responsibly sourced, and scientifically identified. Each specimen comes with a Certificate of Authenticity. This Macrocephalites ornati ammonite fossil from Gruibingen, Germany, is a rare and scientifically significant piece of Jurassic natural history, making it an excellent addition for fossil collectors, natural history enthusiasts, and educational institutions.