RARE Discoidea cylindrica Fossil Echinoid Cretaceous Chalk Newtimber Hill Sussex England Authentic Collector Specimen with COA

Description

This listing presents a rare Discoidea cylindrica fossil echinoid from the Cretaceous Chalk deposits of Newtimber Quarry, Newtimber Hill, West Sussex, England. This uncommon species of irregular echinoid is notable for its cylindrical form and unique adaptations to the Chalk seas of southern England during the Late Cretaceous.

The specimen offered here is the exact one pictured, accompanied by a 1 cm scale cube for accurate size reference. As with all of our items, it is a 100% genuine fossil and comes with a Certificate of Authenticity to ensure its provenance and value.

Geological Context: Cretaceous Chalk of Southern England

The Chalk formations of West Sussex were deposited during the Cretaceous period, approximately 100–66 million years ago, when much of southern England lay beneath a warm, shallow sea. The Chalk is composed primarily of microscopic coccolithophore plates that accumulated on the sea floor.

Within this carbonate-rich environment, echinoids such as Discoidea cylindrica thrived. Over time, flint nodules and chalk preserved these creatures, leaving behind exquisite fossil specimens like this one from Newtimber Quarry, a locality well known for yielding scientifically significant and beautifully preserved echinoids.

Species Overview: Discoidea cylindrica

• Phylum: Echinodermata
• Class: Echinoidea
• Order: Cassiduloida
• Family: Discoididae
• Genus: Discoidea
• Species: Discoidea cylindrica

This echinoid is distinguished by its cylindrical body shape and flattened oral surface. It represents one of the more unusual irregular echinoids of the Cretaceous, with adaptations tailored for life in soft Chalk sediments.

Morphological Features and Adaptations

Key identifying traits of Discoidea cylindrica include:

• A cylindrical, elongate test with a rounded profile.
• Bilateral symmetry, characteristic of irregular echinoids.
• A central petaloid arrangement of ambulacra adapted for respiration and feeding.
• Reduced spines, reflecting its lifestyle as a burrower in carbonate muds.

These features make Discoidea cylindrica particularly distinctive, offering insight into the evolutionary radiation of echinoids during the Cretaceous period.

Collector and Scientific Value

Due to its rarity and unique form, Discoidea cylindrica is a highly prized fossil for collectors of British Chalk echinoids. Specimens of this species are far less common than those of genera such as Micraster or Echinocorys, making it an important acquisition for anyone seeking to expand a serious fossil echinoid collection.

For science and education, Discoidea cylindrica demonstrates how echinoids diversified within the Chalk sea ecosystem, adapting to niche roles within the soft sedimentary environment.

Provenance and Authenticity

This specimen was discovered at Newtimber Quarry, Newtimber Hill, West Sussex, England, a classic British Chalk locality. Carefully selected and preserved, it is sold exactly as photographed. A Certificate of Authenticity is included with every purchase, confirming it as a genuine Cretaceous fossil.

This rare Discoidea cylindrica fossil echinoid is a striking and scientifically significant example of the unique marine life that inhabited the Chalk seas of the Cretaceous period in southern England.