fossil

Fossilized turtle shell or carapace

Testudines indeterminate; shell mainly fossilized calcium-carbonate bone (apatite)

AI-generated identification · may be incorrect

Dark gray-brown, domed, strongly patterned shell plates embedded in pale sedimentary matrix; original bone is typically Mohs 3–5, with dull to slightly waxy luster and cellular/lamellar structure. The surrounding matrix appears fine-grained sandstone or mudstone.

Identified September 13, 2026More fossil →

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At a glance

Common name: Fossilized turtle shell or carapace
Scientific name: Testudines indeterminate; shell mainly fossilized calcium-carbonate bone (apatite)
Category: fossil
Identified: September 13, 2026
Method: Standard

AI Estimated Value

About $100–$2,000 for legally collected, authenticated fragmentary specimens; complete or scientifically important examples may exceed $10,000.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

A turtle carcass was buried in sediment, and groundwater replaced or mineralized its shell over geologic time; the display label appears to indicate the specimen is from the Morrison Formation, Late Jurassic (~156–145 million years ago), western North America.

Uses & applications

Primarily a museum, educational, and collector specimen; not used commercially. Scientific value comes from preserving shell anatomy and Jurassic terrestrial ecosystems.

Geological facts

The polygonal scute pattern is characteristic of a turtle carapace, while the preserved dome represents the fused ribs and vertebral elements beneath the shell.

Field identification & locations

Identify by the domed form, repeated polygonal plates, and bone-like texture rather than random mineral veining; compare with authenticated museum specimens because similar displays can include casts or composites. Morrison fossils commonly occur in Colorado, Wyoming, Utah, and Montana.