Fossil Ammonite Arietites bisulcatus Lower Sinemurian Jurassic Redcar UK Genuine Specimen

Description

Authentic Arietites bisulcatus Fossil Ammonite

This listing presents a genuine Arietites bisulcatus ammonite fossil from the Lower Sinemurian stage of the Early Jurassic, discovered at Redcar, United Kingdom. This remarkable specimen captures the essence of early Jurassic marine life, representing a species of great importance in paleontology and geological study. With bold ribbing and striking detail, it is both a scientific reference and a captivating collector’s item. Each fossil we offer is carefully chosen, photographed individually, and comes with a Certificate of Authenticity.

Geological Age and Formation

The Lower Sinemurian (approximately 199–196 million years ago) was a time of renewed marine diversity following the end-Triassic extinction event. The Redcar coast is one of the classic fossil-bearing localities in Britain, with exposures that reveal rich Sinemurian sediments. Within these strata, ammonites such as Arietites bisulcatus thrived in shallow seas that covered much of what is now northern England. These deposits form part of the well-studied Lower Jurassic succession, making the fossil a valuable piece of stratigraphic history.

Classification and Taxonomy

Arietites bisulcatus belongs to the class Cephalopoda, order Ammonitida, superfamily Psilocerataceae, and family Arietitidae. The genus Arietites includes some of the most iconic large ammonites of the Lower Jurassic, well known for their evolute coiling and strong ribbing. Bisulcatus is a characteristic species within the Bucklandi Zone, serving as a reliable index fossil for dating early Sinemurian sequences across Europe.

Morphological Characteristics

This ammonite is distinguished by its large, robust, and evolute shell, with wide whorls and strongly pronounced ribs. The ribs typically bifurcate (split into two) as they pass across the flanks, a feature that gives Arietites bisulcatus its name. The venter (outer rim of the shell) is often keeled, adding to the streamlined shape adapted for movement through the Jurassic seas. These prominent morphological features not only enhance the fossil’s visual appeal but also make it instantly recognisable to both experts and collectors.

Scientific and Collectible Importance

As a key ammonite species of the Bucklandi Zone, Arietites bisulcatus is widely used in biostratigraphy. Its presence allows geologists to precisely date Lower Sinemurian rock layers and correlate them across different regions. For collectors, this fossil is highly sought after due to its scientific importance and impressive preservation. Owning such a specimen connects you directly to one of the defining fossil groups of the Early Jurassic seas.

Condition and Presentation

The specimen available here has been carefully prepared to highlight its ribbing, coiling, and overall morphology. The photographs provided show the actual ammonite you will receive, accompanied by a 1 cm scale cube for accurate sizing reference. This piece makes an excellent display fossil, perfect for museums, educational settings, or private collections seeking a rare ammonite from a renowned British locality.

Guarantee of Authenticity

All of our fossils are 100% genuine specimens and are issued with a Certificate of Authenticity. This Arietites bisulcatus ammonite fossil from Redcar is a striking and scientifically important addition to any collection, offering both visual beauty and geological significance from the Lower Jurassic seas of Britain.