Rock Identifier

Category

Fossil

Browse fossil specimens identified by the Rock Identifier community.

Learn about Fossil in the encyclopedia

Fossil Opal

Bone Opal

Turritella Jasper

Amber

Fossiliferous Limestone

Fossiliferous Limestone

Turritella Agate

Turritella Agate

Petrified Wood

Diatomite

Guano

Jet

Diatomaceous Earth

Opalized Wood

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Fossilized Shark Tooth (Elasmobranchii (various species, possibly Carcharias or Odontaspis)) — fossil

Fossilized Shark Tooth

Elasmobranchii (various species, possibly Carcharias or Odontaspis)

Fossilized Solitary Rugose Coral (Horn Coral) (Rugosa (Order Rugosa)) — fossil

Fossilized Solitary Rugose Coral (Horn Coral)

Rugosa (Order Rugosa)

Petrified Wood (Silicified wood (Quartz/Chalcedony replacement of cellulose)) — fossil

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of cellulose)

Petrified Wood (Silicified Wood (SiO2 permineralization)) — fossil

Petrified Wood

Silicified Wood (SiO2 permineralization)

Rugose Coral (Horn Coral) (Order Rugosa (extinct fossilized coral)) — sedimentary

Rugose Coral (Horn Coral)

Order Rugosa (extinct fossilized coral)

Fossilized Coral (Favosites) (Favosites (Extinct Tabulate Coral)) — sedimentary

Fossilized Coral (Favosites)

Favosites (Extinct Tabulate Coral)

Fossilized Coral (Anthozoa (Fossilized)) — Sedimentary / Fossil

Fossilized Coral

Anthozoa (Fossilized)

Sedimentary / Fossil

Fossilized Coral (Petoskey Stone or similar Hexagonaria variant) (Hexagonaria percarinata (Fossilized Coral)) — sedimentary

Fossilized Coral (Petoskey Stone or similar Hexagonaria variant)

Hexagonaria percarinata (Fossilized Coral)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Fossilized Shark Tooth in Matrix (Otodus sp. (likely Otodus obliquus)) — sedimentary

Fossilized Shark Tooth in Matrix

Otodus sp. (likely Otodus obliquus)

Crinoid Columnal Fossil (Class Crinoidea (Echinodermata); usually calcite replacement (CaCO3)) — sedimentary

Crinoid Columnal Fossil

Class Crinoidea (Echinodermata); usually calcite replacement (CaCO3)

Fossilized Rugose Coral (Petoskey Stone precursor) (Hexagonaria percarinata (Fossilized Rugose Coral)) — sedimentary

Fossilized Rugose Coral (Petoskey Stone precursor)

Hexagonaria percarinata (Fossilized Rugose Coral)

Weathered limestone (Calcite-rich limestone (CaCO₃), possibly fossiliferous or dolomitic) — sedimentary

Weathered limestone

Calcite-rich limestone (CaCO₃), possibly fossiliferous or dolomitic

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Quartzose) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Limestone (Limestone (CaCO3)) — sedimentary

Limestone

Limestone (CaCO3)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Conglomerate (Conglomeratic Sandstone) — sedimentary

Conglomerate

Conglomeratic Sandstone

Sandstone (Arkose/Quartzose) (Arenite (SiO2 based clastic rock)) — sedimentary

Sandstone (Arkose/Quartzose)

Arenite (SiO2 based clastic rock)

Fossilized Shark Tooth (Carcharocles sp. or similar (Fossilized Fluorapatite)) — sedimentary

Fossilized Shark Tooth

Carcharocles sp. or similar (Fossilized Fluorapatite)

Sandstone (Quartz-rich) (Sandstone (SiO2 dominated)) — sedimentary

Sandstone (Quartz-rich)

Sandstone (SiO2 dominated)

Chert Pebble (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Pebble

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Sandstone (Arenite (SiO2 dominant)) — sedimentary

Sandstone

Arenite (SiO2 dominant)

Shale with Coprolite influence (Argillaceous sedimentary rock (Shale/Mudstone)) — sedimentary

Shale with Coprolite influence

Argillaceous sedimentary rock (Shale/Mudstone)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Calcite-rich sedimentary rock (CaCO3)) — sedimentary

Limestone

Calcite-rich sedimentary rock (CaCO3)

Sandstone with Iron Staining (Arenite (SiO2 based with Fe2O3 staining)) — sedimentary

Sandstone with Iron Staining

Arenite (SiO2 based with Fe2O3 staining)

Limestone with Algal/Lichen Colonization (Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Algal/Lichen Colonization

Calcium Carbonate (CaCO3)

Sandstone (Arenite (primarily SiO2 with various cementing agents)) — sedimentary

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Sandstone (likely Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (likely Quartzose)

Arenite (primarily SiO2)

Sandstone (Arenite/Quartz Arenite) — sedimentary

Sandstone

Arenite/Quartz Arenite

Sandstone (with Iron Staining) (Arenite (SiO2 predominantly)) — sedimentary

Sandstone (with Iron Staining)

Arenite (SiO2 predominantly)

Sandstone (Ferruginous) (Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Fossilized Coral (Cnidaria fossil / Calcite-replaced coral) — fossil

Fossilized Coral

Cnidaria fossil / Calcite-replaced coral

Travertine (likely polished limestone) (Calcite-rich carbonate rock; predominantly CaCO₃) — sedimentary

Travertine (likely polished limestone)

Calcite-rich carbonate rock; predominantly CaCO₃

Limestone with Fossil Impression (Calcium Carbonate (CaCO3)) — sedimentary

Limestone with Fossil Impression

Calcium Carbonate (CaCO3)

Hematite Concretion (Iron oxide (Fe2O3) in concretionary form) — sedimentary

Hematite Concretion

Iron oxide (Fe2O3) in concretionary form

Ironstone Concretion (Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)) — sedimentary

Ironstone Concretion

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)