Petrified Wood
Silicified wood (Quartz, SiO2)
fossil
Category
Mineralized Fossil
Browse mineralized fossil specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 primarily)
sedimentary
Dendritic Siltstone
Siltstone with Manganese Oxide dendrites (MnO2)
sedimentary
Amber (Burmite)
Fossilized tree resin (Succinite variant)
Organic mineraloid
Likely fossilized shell or carbonate concretion
Indeterminate biogenic calcium carbonate, commonly calcite (CaCO₃)
fossil
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Amber (Copal)
Fossilized Tree Resin (C10H16O)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossiliferous Limestone Pebble
Calcite-rich Fossiliferous Marine Limestone
fossil
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
Fossil Coral
Anthozoa fossil (Calcite / SiO2 replacement)
fossil
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
sedimentary
Fossilized Coral
Rugose coral / Tabulate coral (Calcium carbonate, CaCO3)
fossil
Ammonite Fossil
Ammonoidea (Calcium carbonate or Pyrite replaced)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
mineral
Petrified Coral Fossil
Rugose or Tabulate Coral (Hexagonaria or similar fossilized cnidarian)
fossil
Fossiliferous Limestone with Fossil Fragment
Fossiliferous Limestone (CaCO3 with organic remains)
fossil
Crinoid Stem Fossil
Crinoid ossicle (phylum Echinodermata)
fossil
Crinoid Stem Fossil
Class Crinoidea (Sea Lilies)
sedimentary
Limonite Concretion (Goonie or Rattlestone)
Limonite (FeO(OH)·nH2O)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2 / Quartz pseudomorph after wood)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Orbicular granite (likely rapakivi-type granite)
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Favosite Fossil (Calyx or Rugose Coral)
Favosites (Extinct Tabulate Coral)
sedimentary
Boxwork Siderite or Sepatarian Nodule Weathering
Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (CaCO3)
sedimentary
Fossil Coral (Rugose / Horn Coral)
Rugosa (Tetracoralla)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Amber (Copal)
Succiniferous Resin
mineraloid
Fossilized Rugose Coral (Horn Coral)
Order Rugosa
fossil
Fossilized Shark Teeth in Matrix
Cretaceous Chondrichthyes (Shark) remains in Sedimentary Matrix
fossil
Fossiliferous Limestone (with Coralline Inclusions)
Calcium Carbonate (CaCO3)
sedimentary
Mosasaur Jaw Fossil in Matrix
Mosasaurus (family Mosasauridae) in Phosphate Sandstone
sedimentary
Crinoid Stem Fossil
Class Crinoidea (Phylum Echinodermata), often preserved in Limestone or Calcite (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Stromatolite (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossil Shark Tooth (Cretaceous white shark type)
Squalicorax (commonly known as Crow Shark)
Organic specimen (fossil)