Bituminous Coal
Organic sedimentary rock (humic coal)
sedimentary
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
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Fossiliferous Jasper / Miriam Stone / Elephant Skin Jasper
Biogenic Chalcedony / Silicified Fossiliferous Limestone
fossil
Fossilized Coral
Rugose coral / Tabulate coral (Calcium carbonate, CaCO3)
fossil
Fossiliferous Limestone
Biogenic Sedimentary Rock
sedimentary
Polished green moss agate cabochon
Moss agate: microcrystalline quartz (SiO₂) with included chlorite/actinolite or iron-manganese minerals
mineral
Polished fossil-bearing limestone
Fossiliferous micritic limestone, likely containing gastropod or ammonoid fragments
fossil
Concretion
Septarian Concretion (Fragmentary)
sedimentary
Fossil Brachiopod
Phylum Brachiopoda
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))
sedimentary (fossiliferous)
Limestone Boulder
Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Dendritic Agate (Tree Agate)
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Fossil Shark Tooth
Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna
fossil
Chert (with Drusy Quartz Pocket)
Silicon Dioxide (SiO2)
sedimentary
Tumbled fossiliferous limestone
Crinoidal limestone, chiefly calcite (CaCO₃), with fossil echinoderm fragments
fossil
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Fossiliferous Limestone
Sedimentary Calcium Carbonate (CaCO3) Matrix with Fossil Fragments
fossil
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Sea Shell (Mollusk Shell)
Calcium Carbonate (Aragonite/Calcite)
fossil
Fossilized Wood (Petrified Wood) and Associated Rocks
Silicified Wood / Xylopal
fossil
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Flint / Chert Nodule
Microcrystalline quartz (SiO2)
sedimentary
Amber
Fossilized Tree Resin (Successite)
fossil
Fossiliferous Limestone with Fossil Fragment
Fossiliferous Limestone (CaCO3 with organic remains)
fossil
Ferruginous Sandstone (Ironstone)
Sedimentary rock with Limonite/Goethite cement
sedimentary
Fossiliferous Sandstone / Fossil Fragment
Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material
fossil
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
sedimentary
Possible fossilized tooth fragment
Indeterminate fossil enamel/dentine; possibly shark tooth fragment
fossil
Weathered fossilized wood (likely petrified wood)
Silicified wood; commonly quartz/chalcedony replacing wood tissue (SiO₂)
fossil
Fossilized Gastropod Internal Mold
Gastropoda (Steinkern fossil)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of cellulose)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amber
Succinite (C10H16O)
mineral
Petrified Wood
Silicified wood (Quartz pseudomorph after wood)
fossil
Petrified Wood
Silicified wood (SiO2)
fossil
Fossilized Shark Tooth
Chondrichthyes tooth
fossil
Limestone (Tufa/Travertine)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Fossilized Brachiopod
Brachiopoda (e.g., Atrypa or Rhynchonellida)
fossil
Amber
Succinite (fossilized tree resin, C10H16O)
fossil