Rare Harpoceras Ammonite Fossil, Lower Toarcian Stage Jurassic, Authentic Isle of Skye Scotland UK Collectors Specimen with COA

Description

Genuine Jurassic Ammonite Fossil

This listing presents a genuine Harpoceras Ammonite Fossil from the Lower Toarcian Stage of the Early Jurassic period, discovered on the Isle of Skye, Scotland, United Kingdom. Ammonites are extinct marine cephalopods of the subclass Ammonoidea and order Ammonitida, close relatives of squid and cuttlefish. Their spiral, chambered shells are iconic fossils, admired for their beauty and valued for their scientific importance in understanding Earth’s ancient seas. The specimen pictured is the exact one you will receive, with a 1 cm scale cube provided for accurate measurement.

Geological Context – Lower Toarcian, Jurassic

The Lower Toarcian, dating to around 182 million years ago, is a globally significant stage of the Early Jurassic. It is closely associated with the Early Toarcian Oceanic Anoxic Event, a period of widespread changes in ocean chemistry that impacted marine ecosystems and led to the remarkable preservation of marine fossils.

The Isle of Skye is one of the most important fossil localities in Scotland, part of the Hebridean Basin, which preserves marine Jurassic sediments. These rocks represent shallow marine environments where ammonites and other invertebrates thrived in abundance. Fine-grained sediments allowed their shells to be buried and fossilised with excellent detail. Fossils from Skye are especially prized because they come from a region that played a key role in reconstructing Jurassic paleoenvironments in the British Isles.

Species and Classification – Harpoceras

The genus Harpoceras belongs to the family Hildoceratidae, within the superfamily Hildoceratoidea. These ammonites are characterised by their compressed shells, strong ribbing, and a sharp keel running along the venter. Harpoceras species are of great biostratigraphic importance, often used to define ammonite biozones within the Lower Toarcian.

Key features of Harpoceras ammonites include:

• A compressed, planispiral shell with moderately involute coiling.
• Strong ribbing that may bifurcate as it crosses the flanks.
• A pronounced keel along the venter, a hallmark of the genus.
• Visible suture lines representing the intricate internal septal divisions of the shell.

These features make Harpoceras ammonites highly distinctive and scientifically important specimens for stratigraphic studies.

Paleoenvironment and Scientific Importance

During the Early Jurassic, the seas around what is now the Isle of Skye were shallow, warm marine environments. Ammonites such as Harpoceras thrived as nektonic predators, swimming actively through the water column and preying on smaller marine organisms. Upon death, their shells settled into soft seabed sediments, where they were preserved for millions of years.

Because Harpoceras species evolved quickly and had wide geographic distribution, they are particularly valuable in paleontology as index fossils. Their presence allows geologists to precisely date rock strata and correlate them across different regions of Europe. This makes them indispensable to both scientific research and serious fossil collecting.

100% Genuine with Certificate of Authenticity

All of our fossils are guaranteed 100% genuine specimens and come with a Certificate of Authenticity. This Harpoceras ammonite fossil is not a cast or replica but an authentic relic of the Jurassic seas of Scotland, preserved for nearly 182 million years.

A Collector’s and Display Fossil

This Harpoceras ammonite fossil from the Isle of Skye, Scotland is an outstanding specimen for collectors, educators, and enthusiasts of natural history. Its scientific significance, aesthetic ribbing and keel, and geological importance make it a valuable and striking addition to any fossil collection or display.

Scale Rule Squares / Cube = 1 cm. Please see listing photos for the full sizing of this exact specimen.