Wyoming Turritella Shell Fossil Slab in Matrix | 140 g | One of One

Ancient shell mosaic

A one-of-one Wyoming shell fossil slab with a dense field of spiral shell cross-sections preserved through a dark blue-grey mineral matrix. Commonly marketed in the lapidary trade as ‘Turritella agate’, this material is more accurately described as fossiliferous silica or chalcedony containing fossil freshwater gastropods; the trade name comes from the shells’ tall spiral forms.

The supplied note records Wyoming, USA. This style of fossil material is often associated with Eocene lake deposits of the Green River Formation, but the exact formation, locality and species for this specimen have not been supplied. The listing therefore presents it as a collector specimen with the provenance stated on the note, rather than as a laboratory-certified scientific identification.

The cut face reveals dozens of cream, tan and pale shell forms set against a charcoal-to-blue-grey matrix. Natural irregular edges and the rough reverse side keep the piece tactile and geological. At 140 g, it makes a striking display piece for a shelf, cabinet, desk or natural-history collection.

Specimen details

• Common trade name: Turritella shell fossil / ‘Turritella agate’
• Fossil material: Spiral freshwater gastropods preserved in mineralized matrix
• Origin: Wyoming, USA (as marked on the supplied note)
• Geological age: Not specified for this specimen; similar Wyoming material is commonly associated with Eocene lake deposits
• Colour: Charcoal and blue-grey matrix with cream, tan and pale shell outlines
• Finish: Cut display slab with natural rough edges; exact condition shown in the photographs
• Weight: 140 g
• Availability: One of one — quantity 1

Care

Handle gently and display on a stable surface. Avoid drops, hard knocks, prolonged soaking and harsh chemicals; the natural edges and matrix can chip. Please examine all photographs carefully for the specimen’s exact surface, edges and reverse.

The backgrounds are styled editorial composites for presentation. The exact fossil slab shown is the piece supplied; no wood sculpture, acrylic stand or stone prop is included.