Rare 7″ Haugia variabilis Fossil Ammonite, Jurassic, Middle Toarcian, Ilminster UK, Genuine with COA

Description

This listing is for a Rare 7″ Fossil Ammonite of Haugia variabilis from the Middle Toarcian Stage of the Jurassic Period, collected in the well-known fossil locality of Ilminster, Somerset, United Kingdom. Large and finely preserved specimens of this species are highly sought after by collectors and researchers due to their distinctive features and stratigraphic importance.

You will receive the exact fossil shown in the photos, carefully chosen for its excellent preservation and scientific significance.

Scale Rule Squares / Cube = 1cm — please refer to the images for accurate sizing and details.

Key Geological and Scientific Information:

• Species: Haugia variabilis
• Fossil Type: Ammonite (extinct marine cephalopod)
• Geological Period: Jurassic
• Geological Stage: Middle Toarcian (~181 million years ago)
• Location: Ilminster, Somerset, England, UK
• Formation: Beacon Limestone Formation
• Order: Ammonitida
• Superfamily: Hildoceratoidea
• Family: Hildoceratidae
• Described By: Gabilly, mid-20th century

Morphology Features:

Haugia variabilis is a large, moderately evolute ammonite with a compressed whorl section and fine, gently flexuous ribbing that extends across the flanks and venter. The species is known for its variability in ribbing and coiling, which gives it its name. It often features a well-defined umbilicus and strong ribbing in the inner whorls, becoming more smoothed or irregular in the adult stage.

This 7″ specimen displays the classic morphology of the species, with visible ribbing and a well-formed overall shell structure.

Depositional Environment:

The specimen comes from marine sediments of the Beacon Limestone Formation, deposited in a low-energy offshore shelf setting during the Toarcian Oceanic Anoxic Event. These conditions allowed for excellent fossil preservation, especially of cephalopods like ammonites.

Biozone & Stratigraphic Context:

Haugia variabilis is characteristic of the Variabilis Zone, which is a key ammonite biozone used in Middle Toarcian stratigraphy across northwest Europe. This makes it an important taxon for regional and international biostratigraphic correlation.

Scientific Significance:

This species plays a critical role in understanding evolutionary pathways and environmental responses during the Middle Jurassic. Its association with the Toarcian Oceanic Anoxic Event makes it a valuable indicator species in paleoclimatic and geochemical studies.

Authenticity Guarantee:

All of our fossils are 100% genuine specimens, professionally sourced and prepared. Each purchase includes a Certificate of Authenticity, verifying the fossil’s species, age, and discovery location.

This Haugia variabilis ammonite from Ilminster is a rare and scientifically significant specimen — ideal for collectors, educational use, or museum-grade display.