Ammonite Fossil
Ammonoidea (subclass)
fossil
Category
Sedimentary (Fossil)
Browse sedimentary (fossil) specimens identified by the Rock Identifier community.
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Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Fossilized shell or coral fragment
Indeterminate biogenic carbonate; likely calcite/aragonite (CaCO₃)
fossil
Fossilized Bone
Permineralized Bone (Vertebrate Fossil)
fossil
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Sandstone Pebble
Sandstone (primarily SiO2)
sedimentary
Fossil brachiopod
Brachiopoda; likely a spiriferid or strophomenid brachiopod
fossil
Ammonite Fossil
Ammonoidea (subclass)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class) fossilized tooth
fossil
Fossil trilobite
Trilobita (likely a spiny or enrolled trilobite; exact genus unclear)
fossil
Fossil Shark Tooth
Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna
fossil
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (predominantly SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Fossil-bearing sedimentary rock, possibly fossil wood or bone
Indeterminate silicified/carbonate fossil in sandstone or mudstone
fossil
Sandstone
Clastic sedimentary rock (primarily Quartz)
sedimentary
Shale with Iron Staining
Fissile Argillaceous Sedimentary Rock
sedimentary
Weathered limestone
Limestone, predominantly calcite (CaCO₃)
sedimentary
Fossiliferous limestone pebble
Bioclastic limestone, commonly calcitic (CaCO₃)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Siltstone with Fossil Cast
Sedimentary Rock (Siltstone / Fine-grained Sandstone)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone with Iron Oxide Staining
Arenite with Limonite/Hematite alteration
sedimentary
Fossiliferous limestone
Bioclastic calcarenite, predominantly calcite (CaCO₃)
sedimentary
Fossilized Oyster Shell
Gryphaea or Exogyra (Family Ostreidae)
fossil
Fossiliferous Flint or Chert with Bryozoan Fossils
Sedimentary cryptocrystalline quartz (SiO2) with fossil inclusions
sedimentary
Sandstone
Arenite
sedimentary
Sand Tiger Shark Tooth
Carcharias taurus
fossil
Fossilized Shark Tooth
Otodus sp. (approximate genus) / Hydroxyapatite fossil
sedimentary
Polished fossiliferous limestone, possibly ammonite-bearing
Calcite-rich limestone (CaCO₃), with fossil shell material
fossil
Fossilized Bryozoan
Phylum Bryozoa
fossil
Orthoceras Fossil in Limestone
Orthoceras regulare
sedimentary
Polished septarian nodule
Calcite–aragonite–barite septarian concretion, commonly in a claystone or limestone matrix
sedimentary
Sandstone (Red/Brown Variety)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Kambaba Jasper
Rhyolite (Volcanic rock) or Stromatolite (debated)
Igneous/Sedimentary (debated)
Weathered fossiliferous limestone
Calcite-rich limestone (CaCO₃), possibly bioclastic or micritic limestone
sedimentary
Fossilized Shell Fragment
Invertebrate marine fossil, likely calcium carbonate replacement
fossil
Sandstone
Arenite (typically SiO2 + others)
sedimentary
Turritella Agate (Fossiliferous Chert)
Silicified Elimia tenera (Fossiliferous Chalcedony)
sedimentary
Tumbled fossiliferous limestone
Bioclastic limestone, likely crinoidal or shell-rich limestone (calcite, CaCO₃)
sedimentary
Polished fossil coral (likely agatized coral)
Fossilized colonial coral; commonly silicified as chalcedony/quartz (SiO₂)
fossil
Sandstone or Weathered Conglomerate
Sedimentary Rock (Quartzose Sandstone / Lithic Arenite)
sedimentary