Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Category
Mineralized Fossil
Browse mineralized fossil specimens identified by the Rock Identifier community.
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Sandstone Pebbles
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Fossilized Shark Tooth
Elasmobranchii gen. indet.
fossil
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Sandstone (Calcareous or Ferruginous)
Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Likely petrified wood
Silicified wood, chiefly microcrystalline quartz (SiO₂)
fossil
Sandstone (Ferruginous)
Clastic sedimentary rock (SiO2 with Fe2O3)
sedimentary
Orthoceras Fossil
Orthoceras regulare (Extinct Cephalopod)
fossil
Fossilized Echinoid / Sea Urchin Internal Mold
Echinoidea internal cast (steinkern)
fossil
Fossilized Shark Tooth (Sand Tiger)
Carcharias taurus (fossil specimen)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Petrified Wood
Silicified Wood (primarily quartz/chalcedony replacing organic wood structures, SiO2)
fossil
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Stromatolite
Biogenic sedimentary rock / Stromatolite
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
sedimentary
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Fossil Coral
Scleractinia (Fossilized Coral)
fossil
Travertine (likely polished limestone)
Calcite-rich carbonate rock; predominantly CaCO₃
sedimentary
Hematite Concretion
Iron oxide (Fe2O3) in concretionary form
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Fossilized Coral
Scleractinia (Agatized or Calcite replaced)
fossil
Ammonite Fossil
Ammonitida (Extinct subclass of Cephalopoda)
sedimentary
Claystone Concretion
Septarian Concretion (Ironstone-rich)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Fossilized Brachiopod Shell / Mold
Phylum Brachiopoda (Fossilized organic matrix replaced by Silica/Calcite)
fossil
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Shark Tooth
Carcharocles sp. or similar (Fossilized Fluorapatite)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)
sedimentary
Fossil Coral
Hexagonaria (or Rugose/Tabulate coral fossilized in calcium carbonate)
fossil
Fossil Coral
Rugosa or Tabulata coral fossil (Calcium Carbonate, CaCO3)
fossil
Orthoceras Fossil
Orthoceras regulare (Class Cephalopoda, Order Orthocerida)
fossil
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Crinoid Fossil in Limestone
Crinoid columnal (Class Crinoidea) in biomicrite
fossil
Crinoid Stem Fossil
Crinoid ossicle / stalk segment (Phylum Echinodermata)
fossil