sedimentary

Fossilized Turritella Gastropod (Internal Mold)

Turritella (Fossil Gastropod Crust)

AI-generated identification · may be incorrect

Hardness: 3 (calcite-based); Color: Off-white, beige, or grey; Luster: Dull/Earthy; Structure: Spiral/High-spired conical shape; Cleavage: None (conchoidal fracture on matrix).

Hardness: 3 (calcite-based)
Color: Off-white, beige, or grey
Luster: Dull/Earthy

Identified April 7, 2026More sedimentary →

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Physical properties

Hardness: 3 (calcite-based); Color: Off-white, beige, or grey; Luster: Dull/Earthy; Structure: Spiral/High-spired conical shape; Cleavage: None (conchoidal fracture on matrix).

Formation & geological history

Formed through the process of permineralization or as an internal cast (steinkern) where sediment fills the shell of a marine snail; typically found in Eocene or Cretaceous sedimentary deposits (approx. 50-100 million years old).

Uses & applications

Primarily for educational purposes, scientific study, and fossil collecting. Some silica-replaced varieties (Turritella Agate) are used in jewelry.

Geological facts

Turritella fossils are so abundant in certain formations that they create entire 'coquina' layers of rock. The name comes from the Latin word 'turris' meaning tower.

Field identification & locations

Identify in the field by the distinct tapered spiral shape resembling a screw. Commonly found in limestone, shale, or sandstone beds that were once ancient sea floors.