Fossilized Bone Chunk
Permineralized Vertebrate Bone (indeterminant)
fossil
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
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Fossilized honeycomb coral
Fossil coral, commonly Favosites or related tabulate coral
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Weathered fossiliferous limestone
Calcitic limestone; predominantly calcium carbonate (CaCO₃), commonly containing fossil fragments
sedimentary
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Fossiliferous Limestone
Fossiliferous Calcilutite / Biomicrite
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3 with organic inclusions)
fossil
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Coal (Bituminous or Anthracite)
Carbonaceous sedimentary rock (primarily Carbon, C)
sedimentary
Fossilized Shell in Limestone
Bivalve fossil (CaCO3) in Carbonate Sedimentary Rock
sedimentary
Fossiliferous limestone
Bioclastic limestone, primarily calcite (CaCO₃)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Gravel)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Fossiliferous limestone
Bioclastic limestone, chiefly calcite (CaCO₃)
sedimentary
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Ironstone Concretion (Boxwork)
Siderite-Limonite Concretion (FeO(OH)·nH2O)
sedimentary
Fossilized Shell Fragment
Invertebrate marine fossil, likely calcium carbonate replacement
fossil
Amber
Succinite (fossilized organic resin)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Banded Sedimentary Rock (Siltstone/Mudstone with concretion)
Siltstone with Ferruginous Banding
sedimentary
Mosasaur Tooth
Mosasaurus sp.
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Tiger Shark Tooth
Galeocerdo cuvier (fossilized hydroxylapatite)
sedimentary
Fossil Shell Fragment (possibly Brachiopod or Bivalve)
Calcium Carbonate (CaCO3) - Phylum Brachiopoda or Mollusca
sedimentary
Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
mineral
Fossilized bone fragment, possibly dinosaur or large mammal bone
Fossil bone; mineralized apatite (carbonate-fluorapatite), commonly Ca₅(PO₄)₃(F,OH)
fossil
Fossiliferous Limestone
Carbonate Rock (CaCO3 with organic inclusions)
sedimentary
Fossilized Bone Fragment
Vertebrate Fossil Material (Apatite/Calcium Phosphate)
fossil
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Fossilized oyster shell
Ostrea/Exogyra sp.; calcium carbonate (mostly calcite)
fossil
Weathered limestone or calcitic fossil/reef fragment
Calcite-rich limestone (CaCO₃), possibly fossiliferous limestone
sedimentary
Fossiliferous Limestone
Calcium carbonate matrix with macrofossils (CaCO3)
fossil
Fossiliferous limestone, likely with a coral or stromatoporoid fossil
Calcite (CaCO₃) limestone containing fossilized marine skeletal material
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Bivalve Fossil (Fossilized Shell)
Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)
fossil
Weathered limestone pebble
Limestone, predominantly calcite (CaCO₃), possibly fossiliferous or oolitic
sedimentary
Weathered limestone or calcareous sandstone
Calcite-rich carbonate rock, chiefly calcium carbonate (CaCO₃), possibly fossiliferous limestone
sedimentary
Fossiliferous shale or mudstone with a brachiopod fossil
Likely a spiriferid brachiopod fossil in dark shale/mudstone; exact species and age require locality and examination
fossil