Rock Identifier
Stingray Tail Spine Fossil (Dasyatis sp. (Tenthredinidae caudal spine)) — fossil
fossil

Stingray Tail Spine Fossil

Dasyatis sp. (Tenthredinidae caudal spine)

AI-generated identification · may be incorrect

Hardness 4-5 on the Mohs scale, dark grey to black coloration, dull to vitreous luster on the serrated edges, and composed primarily of fossilized dentin and osteodentin.

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Physical properties

Hardness 4-5 on the Mohs scale, dark grey to black coloration, dull to vitreous luster on the serrated edges, and composed primarily of fossilized dentin and osteodentin.

Formation & geological history

Formed during the Cenozoic or Mesozoic eras through the permineralization of cartilaginous fish skeletal material in marine or brackish sediment environments.

Uses & applications

Prized by fossil collectors and used in educational exhibits or unique natural jewelry.

Geological facts

Stingray spines are modified placoid scales containing toxic venom, though the venom degrades over time in fossils. Ancient humans frequently used modern and fossilized stingray barbs as spear points and arrowheads.

Field identification & locations

Identifiable by its elongated, blade-like shape with characteristic bilateral serrations and a longitudinal groove. Commonly found in marine fossil deposits such as phosphate mines and coastal cliffs.

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