Petrified Wood
Silicified wood (Quartz, 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
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Fossiliferous Limestone (Coquina / Shell Limestone)
Bioclastic Limestone (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Sandy Ironstone
Ferruginous Sandstone
sedimentary
Coal
Anthracite or Bituminous Coal
sedimentary
Petoskey Stone / Rugose Coral Fossil
Hexagonaria percarinata
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized echinoid (sea urchin), likely a flint/chalk-associated test
Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)
fossil
Seashell Fossil
Invertebrate fossil (phylum Mollusca)
fossil
Charlevoix Stone
Favosites alpenensis
fossil
Fossil Shark Tooth
Otodus sp. (possibly Otodus obliquus)
fossil
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood (SiO2)
metamorphic
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (with iron oxide cement, Fe2O3)
sedimentary
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Order: Rugosa)
sedimentary
Fossilized Gastropod (Snail)
Class Gastropoda (internal mold or 'steinkern')
sedimentary
Limestone (Fossiliferous)
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Sandstone
Arenite
sedimentary
Fossilized Shark Tooth
Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron
sedimentary
Shale (with minor calcite veining)
Clastic sedimentary rock (primarily clay minerals and quartz)
sedimentary
Petrified Wood
Silicified wood (permineralized wood)
fossil
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Weathered limestone slab
Micritic limestone, primarily calcite (CaCO₃)
sedimentary
Fossil Shark Tooth
Squalicorax (likely Squalicorax pristodontus or Squalicorax falcatus)
fossil
Sandstone Pebble
Arenite (Clastic Sedimentary Rock)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Fossilized bivalve shell fragment
Fossil Mollusca, likely a bivalve (class Bivalvia); exact genus cannot be determined from the image
fossil
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Vesicular basalt (likely scoria)
Mafic volcanic rock; predominantly plagioclase, pyroxene, and volcanic glass, with possible olivine
igneous
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Fossiliferous Limestone (Crinoidal)
Bioclastic Limestone (predominantly CaCO3)
sedimentary
Fossilized shell or brachiopod
Likely a calcareous brachiopod or bivalve fossil; exact identification requires clearer detail and scale
fossil
Fossilized Shark Tooth (Fragment)
Elasmobranchii (fossilized tooth)
fossil
Petrified Wood
Silicon Dioxide Fossilized Wood (SiO2)
fossil
Amber
Succinite (specifically for Baltic amber); Complex mixture of organic compounds (C10H16O)
Organic Mineraloid
Fossilized Shark Tooth
Elasmobranchii fossil (likely Odontaspididae family)
sedimentary