Petrified Wood
Silicified Wood (SiO2)
fossil
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossiliferous Chert (Chert with Crinoid Stem Impression)
Chert (SiO2) with fossil Anthozoan or Crinoid columnals
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. indet.
fossil
Liesegang Ring Siltstone
Siltstone with iron oxide Liesegang bands
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified wood (primarily quartz replacing organic cellulose)
fossil
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Fossil brachiopod shell
Likely spiriferid or strophomenid brachiopod; calcium carbonate (primarily calcite)
fossil
Fossilized Coral (Petoskey Stone / Favosites)
Hexagonaria percarinata / Favosites sp. (Calcite, CaCO3)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (Quartzo-feldspathic fossil wood)
fossil
Iridescent Ammonite
Ammonoidea (Species: likely Cleoniceras or Desmoceras); Mineral: Aragonite/Ammolite (CaCO3)
sedimentary (fossilized)
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)
Ammonoidea
sedimentary
Amber
Succinite (fossilized tree resin)
fossil
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Kambaba Jasper
Stromatolite Jasper (Microcrystalline Quartz with Cyanobacteria fossile)
sedimentary
Shiva's Eye (Cat's Eye Shell)
Operculum of Turbo marmoratus
fossil
Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 based with mineral cements)
sedimentary
Rugose Coral (Horn Coral) Fossil in Limestone
Order Rugosa (commonly Grewingkia or Zaphrentis genus)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossilized Gastropod Shell
Class Gastropoda (Fossil)
sedimentary
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class) - Often found as Micraster or Clypeaster specimens
sedimentary
Petrified Wood
Silicified Wood / Xylopal
fossil
Fossilized coral or porous marine limestone
Likely fossil coral (Scleractinia), composed mainly of calcite/aragonite (CaCO₃)
fossil
Amber (with potentially inclusions)
Succinite (Fossilized Tree Resin)
Mineraloid
Sandstone (Calcareous or Ferruginous)
Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Likely petrified wood or silicified fossil fragment
Silicified wood; predominantly microcrystalline quartz (SiO₂)
fossil
Fossilized Horn Coral
Rugosa (Rugose Coral)
fossil
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Fossilized Coral (Petoskey Stone or Rugose Coral)
Antophyllum (Hexagonaria) or Scleractinia (CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Amber
Succinite (Fossilized Tree Resin, C10H16O)
gemstone