Rock Identifier

Category

Organic Specimen (Fossil)

Browse organic specimen (fossil) specimens identified by the Rock Identifier community.

Learn about Organic Specimen (Fossil) in the encyclopedia

Petrified Wood

Amber

Jet

Opalized Wood

Fossilized Tabulate Coral in Sandstone/Limestone (Favosites (Order: Tabulata)) — fossil

Fossilized Tabulate Coral in Sandstone/Limestone

Favosites (Order: Tabulata)

Crinoid Marble (Crinoidal Limestone/Marble) — fossil

Crinoid Marble

Crinoidal Limestone/Marble

Fossilized Coral (Favosites) (Favosites goldfussi) — fossil

Fossilized Coral (Favosites)

Favosites goldfussi

Crinoid Stem Fossil (Crinoidea (Class)) — fossil

Crinoid Stem Fossil

Crinoidea (Class)

Petoskey Stone (Weathered/Rough Form) (Hexagonaria percarinata) — fossil

Petoskey Stone (Weathered/Rough Form)

Hexagonaria percarinata

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone (Arenite (predominantly Quartz Sandstone)) — sedimentary

Sandstone

Arenite (predominantly Quartz Sandstone)

Sandstone (likely Arkosic or Lithic) (Clastic Sedimentary Rock (composed mostly of SiO2)) — sedimentary

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (composed mostly of SiO2)

Coquina (Coquina Limestone (CaCO3)) — sedimentary

Coquina

Coquina Limestone (CaCO3)

Sandstone (Iron-stained) (Arenite (primarily Quartz, SiO2)) — sedimentary

Sandstone (Iron-stained)

Arenite (primarily Quartz, SiO2)

Sandstone Pebble (Arenite (SiO2 principal)) — sedimentary

Sandstone Pebble

Arenite (SiO2 principal)

Sandstone (Stream-rounded Cobble) (Arenite (composed primarily of SiO2, Silica)) — sedimentary

Sandstone (Stream-rounded Cobble)

Arenite (composed primarily of SiO2, Silica)

Polished fossilized wood (likely petrified wood) (Silicified wood; commonly quartz (SiO₂) replacing wood tissue) — fossil

Polished fossilized wood (likely petrified wood)

Silicified wood; commonly quartz (SiO₂) replacing wood tissue

Petoskey Stone (Fossilized Rugose Coral) (Hexagonaria percarinata) — fossil

Petoskey Stone (Fossilized Rugose Coral)

Hexagonaria percarinata

Fossilized Sand Tiger Shark Tooth (Carcharias sp. (likely Carcharias taurus or Striatolamia)) — fossil

Fossilized Sand Tiger Shark Tooth

Carcharias sp. (likely Carcharias taurus or Striatolamia)

Fossilized Tabulate Coral (Favosites (Honeycomb Coral)) — fossil

Fossilized Tabulate Coral

Favosites (Honeycomb Coral)

Fossil Coral (Favosites) (Favosites sp. (Phylum Cnidaria, Class Anthozoa)) — fossil

Fossil Coral (Favosites)

Favosites sp. (Phylum Cnidaria, Class Anthozoa)

Sandstone (Stream-Rolled) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Stream-Rolled)

Clastic Sedimentary Rock (primarily SiO2)

Red Sandstone (Sandstone (principally Quartz with Iron Oxide coating)) — sedimentary

Red Sandstone

Sandstone (principally Quartz with Iron Oxide coating)

Conglomerate (Conglomeratic Sandstone) — sedimentary

Conglomerate

Conglomeratic Sandstone

Petrified wood (Silicified fossil wood; commonly quartz (SiO₂) replacing wood) — fossil

Petrified wood

Silicified fossil wood; commonly quartz (SiO₂) replacing wood

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

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of cellulose)

Glauconitic Sandstone (Glauconitic Sandstone (Greensand)) — sedimentary

Glauconitic Sandstone

Glauconitic Sandstone (Greensand)

Ironstone Concretion (Siderite or Hematite Concretion (FeCO3 or Fe2O3)) — sedimentary

Ironstone Concretion

Siderite or Hematite Concretion (FeCO3 or Fe2O3)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Flexicalymene Trilobite Fossil (Flexicalymene meeki (Order Phacopida, Family Calymenidae)) — sedimentary

Flexicalymene Trilobite Fossil

Flexicalymene meeki (Order Phacopida, Family Calymenidae)

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Weathered sandstone or siltstone (Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by clay, silica, or iron oxides) — sedimentary

Weathered sandstone or siltstone

Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by clay, silica, or iron oxides

Fossiliferous Limestone Pebble (Biogenic Sedimentary Rock (CaCO3)) — fossil

Fossiliferous Limestone Pebble

Biogenic Sedimentary Rock (CaCO3)

Concretion (Septarian concretion (likely containing Calcite or Siderite)) — sedimentary

Concretion

Septarian concretion (likely containing Calcite or Siderite)

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

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 based)

Fossilized trilobite (Trilobita; likely an enrolled asaphid or phacopid trilobite) — fossil

Fossilized trilobite

Trilobita; likely an enrolled asaphid or phacopid trilobite

Crinoid Stem Fossil (Class Crinoidea (Echinodermata)) — fossil

Crinoid Stem Fossil

Class Crinoidea (Echinodermata)

Favosites Fossil (Honeycomb Coral) (Favosites alpenensis (Order: Tabulata)) — fossil

Favosites Fossil (Honeycomb Coral)

Favosites alpenensis (Order: Tabulata)

Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Fossilized Horn Coral (Rugosa (Order)) — fossil

Fossilized Horn Coral

Rugosa (Order)

Bivalve Fossil (Internal Mold) (Class Bivalvia (Indeterminate genus)) — fossil

Bivalve Fossil (Internal Mold)

Class Bivalvia (Indeterminate genus)

Fossilized Rugose Coral (Order Rugosa) — fossil

Fossilized Rugose Coral

Order Rugosa

Red Sandstone (Sandstone (mainly SiO2 with Iron Oxide cement)) — sedimentary

Red Sandstone

Sandstone (mainly SiO2 with Iron Oxide cement)

Sandstone (Arenite (SiO2 predominantly)) — sedimentary

Sandstone

Arenite (SiO2 predominantly)

Shale (Laminated Mudstone) — sedimentary

Shale

Laminated Mudstone

Sandstone (Arenite) — sedimentary

Sandstone

Arenite