Rock Identifier
Turritella Gastropod Fossil (Turritella (mollusk fossil in sedimentary matrix)) — fossil
fossil

Turritella Gastropod Fossil

Turritella (mollusk fossil in sedimentary matrix)

Hardness: 3-4 (calcitic shell) or 7 (if silicified); Color: Tan, gray, or brown matrix with white or translucent shell; Luster: Dull/earthy matrix, waxy/pearly shell; Structure: Spiral conical shell (high-spired) cross-section.

Hardness
3-4 (calcitic shell) or 7 (if silicified)
Color
Tan, gray, or brown matrix with white or translucent shell
Luster
Dull/earthy matrix, waxy/pearly shell
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Physical properties

Hardness: 3-4 (calcitic shell) or 7 (if silicified); Color: Tan, gray, or brown matrix with white or translucent shell; Luster: Dull/earthy matrix, waxy/pearly shell; Structure: Spiral conical shell (high-spired) cross-section.

Formation & geological history

Formed through the burial of marine snails in sediment during the Cenozoic or Mesozoic eras. Over millions of years, the sediment hardened into limestone or shale, preserving the external molds or internal casts of the shells.

Uses & applications

Educational specimens, architectural stone (Turritella Agate), fossil collecting, and decorative display pieces.

Geological facts

Members of the Turritella genus are known as 'screw shells' due to their long, tapered spiral shape. While commonly found in sedimentary rocks, some famous deposits in Wyoming have been completely silicified into Chalcedony, creating a beautiful gemstone known as Turritella Agate.

Field identification & locations

Identified by the distinct conical, multi-whorled spiral cross-sections visible on the rock surface. Commonly found in ancient marine sea beds, coastal cliffs, and regions like the Green River Formation in the US.

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