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

Fossilized Echinoid (Sea Urchin) (Echinoidea (Class), often found as calcitic fossils) — sedimentary

Fossilized Echinoid (Sea Urchin)

Echinoidea (Class), often found as calcitic fossils

Fossilized Bark (Lepidodendron / Sigillaria fossil impression) — fossil

Fossilized Bark

Lepidodendron / Sigillaria fossil impression

Amber (Succiniferous fossil resin (C10H16O)) — fossil

Amber

Succiniferous fossil resin (C10H16O)

Fossiliferous Shale or Slate with Plant Fossils (Fossil-bearing argillaceous rock) — Sedimentary/Metamorphic

Fossiliferous Shale or Slate with Plant Fossils

Fossil-bearing argillaceous rock

Sedimentary/Metamorphic

Fossiliferous Limestone (Limestone with fossil inclusions (CaCO3)) — sedimentary

Fossiliferous Limestone

Limestone with fossil inclusions (CaCO3)

Kambaba Jasper (Rhyolite (with Stromatolite fossil inclusions)) — sedimentary

Kambaba Jasper

Rhyolite (with Stromatolite fossil inclusions)

Fossilized Shark Tooth (Sand Tiger) (Carcharias taurus (fossil specimen)) — sedimentary

Fossilized Shark Tooth (Sand Tiger)

Carcharias taurus (fossil specimen)

Amber (specifically Burmese Amber or Burmite) (Succiniferous fossil resin (C10H16O)) — mineraloid

Amber (specifically Burmese Amber or Burmite)

Succiniferous fossil resin (C10H16O)

Calamites (Calamites (Pith cast fossil)) — sedimentary

Calamites

Calamites (Pith cast fossil)

Weathered limestone or calcareous sandstone (Likely micritic limestone (calcite, CaCO₃), possibly carbonate-rich sandstone) — sedimentary

Weathered limestone or calcareous sandstone

Likely micritic limestone (calcite, CaCO₃), possibly carbonate-rich sandstone

Jasper (likely Kambaba or Crocodile Jasper variety) (Silicon Dioxide (SiO2) with inclusions) — sedimentary

Jasper (likely Kambaba or Crocodile Jasper variety)

Silicon Dioxide (SiO2) with inclusions

Sandstone (Arenite (SiO2 based with mineral cements)) — sedimentary

Sandstone

Arenite (SiO2 based with mineral cements)

Sandstone (Arenite (SiO2 principal component)) — sedimentary

Sandstone

Arenite (SiO2 principal component)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Sandstone (Arenite (SiO2 with various cementing minerals)) — sedimentary

Sandstone

Arenite (SiO2 with various cementing minerals)

Sandstone (Sandstone (clastic sedimentary rock)) — sedimentary

Sandstone

Sandstone (clastic sedimentary rock)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous) (Arenite (with iron oxide cement, Fe2O3)) — sedimentary

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

Sandstone (Red/Brown Variety) (Arenite (SiO2 with iron oxide impurities)) — sedimentary

Sandstone (Red/Brown Variety)

Arenite (SiO2 with iron oxide impurities)

Flint / Chert (Silicon Dioxide (SiO2)) — sedimentary

Flint / Chert

Silicon Dioxide (SiO2)

Weathered limestone fragments (Limestone, primarily calcite (CaCO₃)) — sedimentary

Weathered limestone fragments

Limestone, primarily calcite (CaCO₃)

Weathered limestone (Calcitic limestone, mainly calcium carbonate (CaCO₃)) — sedimentary

Weathered limestone

Calcitic limestone, mainly calcium carbonate (CaCO₃)

Slate with Fossiliferous Impressions (Metamorphosed Argillaceous Rock (Fossiliferous Slate)) — metamorphic

Slate with Fossiliferous Impressions

Metamorphosed Argillaceous Rock (Fossiliferous Slate)

Ferruginous Sandstone Concretion (Ironstone Phosphorite) (Ferruginous Sandstone (variable Fe-oxide/hydroxide composition)) — sedimentary

Ferruginous Sandstone Concretion (Ironstone Phosphorite)

Ferruginous Sandstone (variable Fe-oxide/hydroxide composition)

Sandstone with Trace Fossils (Arenite / Quartzwacke with Ichnofossils) — sedimentary

Sandstone with Trace Fossils

Arenite / Quartzwacke with Ichnofossils

Rounded fossiliferous limestone or weathered limestone nodule (Likely bioclastic limestone, composed mainly of calcite (CaCO₃); exact identification is limited by the blurry image) — sedimentary

Rounded fossiliferous limestone or weathered limestone nodule

Likely bioclastic limestone, composed mainly of calcite (CaCO₃); exact identification is limited by the blurry image

Vesicular basalt (likely weathered scoria) (Basaltic volcanic rock; chiefly plagioclase, clinopyroxene, and olivine with vesicles) — igneous

Vesicular basalt (likely weathered scoria)

Basaltic volcanic rock; chiefly plagioclase, clinopyroxene, and olivine with vesicles

Orbicular granite (likely rapakivi-type granite) (Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende) — igneous

Orbicular granite (likely rapakivi-type granite)

Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende

Weathered chert or silicified limestone nodule (Microcrystalline quartz (SiO₂), possibly replacing limestone; exact identification requires testing) — sedimentary

Weathered chert or silicified limestone nodule

Microcrystalline quartz (SiO₂), possibly replacing limestone; exact identification requires testing

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

Sandstone (Quartzose)

Arenite (SiO2 based)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Fossiliferous conglomerate (Bioclastic, carbonate-cemented conglomerate (likely limestone matrix)) — sedimentary

Fossiliferous conglomerate

Bioclastic, carbonate-cemented conglomerate (likely limestone matrix)

Coquina (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossilized Bone (Permineralized Bone (Vertebrate Fossil)) — fossil

Fossilized Bone

Permineralized Bone (Vertebrate Fossil)

Fossil Coral (Phylum Cnidaria / Scleractinia) — fossil

Fossil Coral

Phylum Cnidaria / Scleractinia

Fossiliferous limestone (Bioclastic carbonate rock, chiefly calcite (CaCO₃)) — sedimentary

Fossiliferous limestone

Bioclastic carbonate rock, chiefly calcite (CaCO₃)

Sandstone and Mixed Rock Assemblage (Clastic Sedimentary Rock / Quartz Arenite) — sedimentary

Sandstone and Mixed Rock Assemblage

Clastic Sedimentary Rock / Quartz Arenite

Sandstone and Gravel Aggregate (Clastic Sedimentary Rock / Quartzose Sandstone) — sedimentary

Sandstone and Gravel Aggregate

Clastic Sedimentary Rock / Quartzose Sandstone

Chert Nodule in Limestone (Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)) — sedimentary

Chert Nodule in Limestone

Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)