Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
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Fossilized Shark Tooth (Anterior/Lateral)
Otodus megalodon or Carcharodon carcharias (fossilized)
fossil
Bivalve Fossil (Clam Stone)
Phylum Mollusca, Class Bivalvia
fossil
Fossilized Shark Tooth (Otodus)
Otodus obliquus
fossil
Worn River Pebble with Fossil Indentation
Sedimentary Rock with Fossil Infill
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic Inclusions
sedimentary
Chert (Siliceous Mudstone variant)
Microcrystalline quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Turritella Agate (Calligrapher Stone)
Silicified Elimia tenera (Chalcedony/Quartz)
sedimentary
Weathered sandstone or limestone fragment
Likely quartz-rich sandstone or calcitic limestone; exact identification is uncertain from the image
sedimentary
Weathered fossiliferous limestone or fossil fragment
Indeterminate bioclastic carbonate rock; likely calcite (CaCO₃) with fossil shell material
fossil
Fossil shark tooth
Likely Otodus megalodon (species identification uncertain from image)
fossil
Fossilized Mammoth Tooth Fragment
Mammuthus primigenius (or Mammuthus sp.)
fossil
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Coprolite
Coprolite (fossilized feces)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Biomicrite / Fossiliferous Limestone (CaCO3)
fossil
Sandstone
Arenite (SiO2 principal composition)
sedimentary
Fossilized Brachiopod Shell
Order Spiriferida (likely)
fossil
Fossiliferous Limestone Pebble
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Light-colored chert or weathered limestone
Microcrystalline quartz (SiO₂) or calcitic limestone (CaCO₃); exact identification requires testing
sedimentary
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
sedimentary
Fossil coral fragment (probable)
Recrystallized fossil coral, commonly scleractinian or tabulate coral; exact identification requires magnification and locality
fossil
Limestone with Fossil Fragment
Sedimentary carbonate rock (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Coral
Rugose Coral / Hexagonaria (Fossilized calcium carbonate)
fossil
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Limestone (specifically Fossiliferous or Crinoidal Limestone)
Calcium Carbonate (CaCO3) - Calcite Rock
sedimentary
Limestone with Fossil Inclusion
Calcium Carbonate (CaCO3) - Bioclastic Limestone
sedimentary
Amber
Succinite (C10H16O)
mineral
Fossilized Shark Tooth
Selachii (Elasmobranchii subclass)
fossil
Amber
Succinurite (C10H16O)
mineraloid
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Weathered carbonate rock, possibly fossiliferous limestone
Calcite-rich limestone (CaCO₃), tentative identification
sedimentary
Limestone with Chert or Siltstone bands
Sedimentary carbonate rock (CaCO3) often with siliceous impurities
sedimentary
Sandstone (likely Fossiliferous Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (Chert Nodule)
Silicon Dioxide (SiO2)
sedimentary
Baltic Amber
Succinite (Fossilized Resin)
fossil
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
mineral
Fossilized Shark Tooth (Megalodon or Carcharocles fragment)
Elasmobranchii (Fossilized tooth root / crown section)
fossil
Shale
Shale (clay-sized silicate minerals)
sedimentary