RARE Arnioceras semicostides Fossil Ammonite Multi-Block – Lower Sinemurian, Jurassic, Charmouth, UK – Genuine Specimen with COA

Description

This is a rare Arnioceras semicostides fossil ammonite multi-block, dating back to the Lower Sinemurian stage of the Early Jurassic period (~199-195 million years ago), discovered in Charmouth, United Kingdom. Arnioceras is a genus of early Jurassic ammonites, known for their distinctive evolute shells with strong radial ribbing. This multi-block specimen features multiple ammonites embedded in matrix, offering a stunning natural display of a Jurassic marine ecosystem.

The Charmouth region of the Jurassic Coast is world-famous for its exceptional fossil deposits, particularly ammonites from the Lower Lias Formation. This fossilized ammonite cluster provides insight into ancient marine environments and is a highly collectible and scientifically valuable piece.

Geological Information:

• Formation: Lower Lias Formation
• Stage: Lower Sinemurian (~199-195 million years old)
• Location: Charmouth, United Kingdom
• Depositional Environment: Shallow marine seafloor with fine-grained sediment accumulation

Fossil Characteristics:

• Multiple Arnioceras ammonites preserved in matrix
• Evolute shell structure with well-defined radial ribbing
• Exceptional preservation of suture patterns and shell details
• Rare Early Jurassic multi-specimen fossil from the UK

Key Features:

• Authentic Arnioceras semicostides fossil ammonite multi-block
• Rare and visually impressive Lower Jurassic ammonite cluster
• From the Alice Purnell Collection
• 100% genuine specimen with Certificate of Authenticity

Scale Rule / Cube = 1cm – Please refer to the photos for accurate sizing.

All fossils are securely packaged for worldwide shipping.