sedimentary
Fossiliferous Kalkstein (Marl/Sandstone)
Fossiliferous calcarenite/siltstone
AI-generated identification · may be incorrectHardness: 3-4 (matrix), Color: Gray to buff, Luster: Dull/Earthy, Crystal Structure: Microcrystalline with organic inclusions, Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 3-4 (matrix), Color: Gray to buff, Luster: Dull/Earthy, Crystal Structure: Microcrystalline with organic inclusions, Specific Gravity: 2.6-2.7
Formation & geological history
Formed in a marine or fluvial sedimentary basin during the Neogene (Pliocene/Miocene), common in the Piedmont Basin of Italy. It consists of lithified silt or sand containing fossilized organic remains.
Uses & applications
Geological study, amateur fossil collecting, and historical use in local Piedmontese masonry.
Geological facts
The Stura di Demonte river near Fossano cuts through Pliocene sedimentary layers known for rich fossil deposits, including mollusks and plant remains. This specimen likely contains internal molds of shells or burrow structures.
Field identification & locations
Identify by searching for symmetrical imprints or hollows in river-worn cobbles. Found in the gravel beds of the Stura river near Fossano, Italy.
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