Polished Crinoid Fossil Slab Jurassic Lyme Regis Dorset UK Lower Lias Stonebarrow

Description

Authentic Polished Crinoid Slab from the Jurassic Coast

Offered here is a genuine polished crinoid fossil slab from the Lower Lias of the Jurassic Coast, collected at Stonebarrow, Charmouth, Lyme Regis, Dorset, UK. This carefully chosen specimen preserves multiple crinoid elements naturally embedded within the original sedimentary matrix, professionally polished to enhance detail while maintaining full geological authenticity. The photographs show the exact fossil slab you will receive, and full sizing details are provided in the images.

This fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card, ensuring long-term confidence in provenance and collectability.

Geological Formation and Age

This crinoid slab originates from the Lower Lias Group, deposited during the Early Jurassic Period, approximately 199–191 million years ago, within the Sinemurian Stage. During this time, southern Britain was submerged beneath a warm, shallow epicontinental sea. Fine muds and calcareous sediments accumulated on the sea floor, creating ideal conditions for the preservation of delicate echinoderm remains. Stonebarrow is a well-known fossil-bearing section of the Jurassic Coast, producing abundant and well-preserved marine invertebrates that are key to understanding Early Jurassic marine ecosystems.

Fossil Type and Biological Context

Crinoids are marine echinoderms, commonly known as sea lilies, related to modern starfish and sea urchins. They lived anchored to the sea floor by a stalk, using feathery arms to filter food particles from the water column. The fossil material preserved within this slab primarily consists of crinoid columnals and stem fragments, which are among the most frequently preserved parts of the crinoid skeleton. These fossils represent thriving benthic communities that flourished in Jurassic seas.

Morphology and Polished Presentation

The slab displays numerous cylindrical crinoid columnals, often showing central lumens and articulation surfaces where individual segments joined together in life. Polishing enhances contrast between the fossil material and the surrounding matrix, bringing out fine structural detail, natural colour variation, and textural differences. The smooth, flat finish makes the slab ideal for handling and display while preserving the original spatial distribution of the fossils within the rock.

Depositional Environment

During the Early Jurassic, the Stonebarrow and Charmouth area lay beneath a calm, shallow marine environment with relatively low sediment energy. Crinoids thrived on the sea floor, often forming dense meadows. Periodic sediment influx and low-oxygen conditions led to rapid burial of skeletal material following death or storm disturbance. These conditions favoured the preservation of crinoid debris within bedding planes, resulting in slabs such as this that capture snapshots of ancient sea-floor communities.

Collecting, Display, and Educational Value

This polished crinoid fossil slab is well suited for serious fossil collectors, educational settings, museum displays, or refined interior presentation. Its classic British provenance, clear geological context, and visually striking polished finish make it both scientifically informative and aesthetically appealing. Crinoid slabs from the Lower Lias are valued for their ability to illustrate Jurassic marine life and sedimentary processes in a single specimen. Each fossil we offer is individually selected, ensuring you receive an authentic and carefully curated piece of Early Jurassic marine history from one of the world’s most important fossil coastlines.