XL Ammonite Specimen With Intricate Suture Patterns and Bivalves Attached, Jurassic Period - Dorset Coast, England

A large ammonite specimen preserving well-defined whorl structure and intricate suture patterns. The shell retains strong three-dimensional ribbing across the preserved whorls, with areas of deep red and orange mineral staining enhancing surface definition.

The specimen is mostly complete, with loss to a portion of the outer whorl, resulting in a slightly irregular overall outline. Due to size of the fossil in its current state of preservation, it’s evident that in life this would have been an ammonite of very significant size. 

The reverse of the specimen preserves attached fossil bivalves, indicating a shared depositional environment and post-mortem association on the seafloor.

The fossil is a beach find from Dorset, England, a region well known for Jurassic marine deposits. The specimen has been stabilised with Paraloid B72, consistent with standard conservation practice.

Specimen Details

Object Type: Ammonite with associated bivalves

Material: Fossilised aragonite/calcite replacement

Locality: Dorset, England (beach find)

Age: Jurassic period (likely, typical Dorset material)

Dimensions: 240 mm × 230 mm × 48 mm (to largest points)

Condition: Mostly complete; partial outer whorl missing; stable

Conservation: Stabilised with Paraloid B72 (removable conservation grade material) 
Features: Preserved ribbing, visible suture patterns, attached bivalves, iron-rich red/orange staining