Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus
fossil
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
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Coral Fossil (Favosites)
Favosites (order Tabulata)
fossil
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Megalodon Shark Tooth Fossil
Otodus megalodon (fossilized in sedimentary matrix)
sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites goldfussi / Order Tabulata
fossil
Belemnoit Fossil (Thunderstick)
Belemnitida (Internal rostrum)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Favosites (Fossil Coral)
Favosites (Extinct Tabulate Coral)
sedimentary
Horse Chestnut (Buckeye seed)
Aesculus hippocastanum seed
Organic (Non-geological)
Shale
Laminated Mudstone (Shale)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
sedimentary
Siltstone
Siltstone (fined-grained clastic sedimentary rock)
sedimentary
Sandstone (Weathered Cobble)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone Concretion
Clastic Sedimentary Concretion (SiO2 with Iron Oxide)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone Pebble
Sandstone (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone (with cross-bedding)
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Limestone (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone (specifically Chalky Limestone)
Calcium Carbonate (CaCO3 / Calcite)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Rounded brown pebble, likely weathered sandstone or iron-stained quartzite
Probable quartz-rich sandstone (SiO₂-dominated); exact identification requires testing
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (with Feldspathic/Arkose qualities)
Arenite (primarily SiO2 with KAlSi3O8 components)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Siltstone (or Red Shale)
Clastic Sedimentary Rock (Composition: primarily Quartz, Clay minerals, and Hematite Fe2O3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (Jasper)
Silicon dioxide (SiO2)
sedimentary
Operculum shell (often called "Shiva's Eye" or "Cat's Eye")
Operculum of a gastropod (e.g., Turbinidae family), primarily Calcium Carbonate (CaCO3) in the form of aragonite.
fossil
Cockle Shell (Bivalve)
Cardiidae (Calcium Carbonate, CaCO3)
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Mosasaur Tooth
Mosasauridae (likely Prognathodon or Enchodus sp.)
fossil
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Witch Stone (Hag Stone)
Perforated Sedimentary Rock (Typically Sandstone or Limestone)
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Fossilized Rugose Coral
Order Rugosa
fossil
Crinoid Columnal Fossil
Crinoid ossicle (Class Crinoidea)
sedimentary