Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Category
Sedimentary (Fossil)
Browse sedimentary (fossil) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
sedimentary
Bivalve Fossil (Clam)
Class Bivalvia (Mollusca)
fossil
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Mercenaria or similar genus)
fossil
Witch Stone (Hag Stone)
Perforated Sedimentary Rock (Typically Sandstone or Limestone)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of cellulose)
fossil
Limestone Riprap
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Stromatolite fossil in Chert/Jasper
Cyanobacteria / Microcystis (fossilized)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood Agate
Silicified Wood (primarily SiO2)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Ironstone (likely siderite or goethite-rich siltstone)
Ferruginous Siltstone
sedimentary
Crinoid Fossil Stem Segment
Class Crinoidea (Echinodermata)
sedimentary
Coquina and Oyster Fossil Rock
Coquina limestone (Calcium Carbonate, CaCO3) containing fossilized Crassostrea / bivalve shells
fossil
Sedimentary Strata of the Badlands (Mudstone, Siltstone, and Sandstone)
White River Group (Brule and Chadron Formations)
sedimentary
Trilobite Fossil in Limestone
Trilobita (Class), likely embedded in fossiliferous limestone (CaCO3)
fossil
Coal (Anthracite or Bituminous)
Carbonaceous sedimentary rock (Carbon)
sedimentary
Chert (and Fossilized Brachiopod shell)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood / Fossilized Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Petrified Wood
Silicified wood / Permineralized wood (SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Sandstone
Arenite (primarily SiO2)
sedimentary
Brachiopod or Bivalve Fossil in Limestone
Phylum Brachiopoda or Bivalvia (embedded in Calcium Carbonate matrix)
fossil
Horn Coral Fossil
Order Rugosa
fossil
Fossilized oyster or other bivalve shell
Calcitic bioclast, commonly Ostrea spp. or Exogyra spp.
fossil
Fossilized Angel Wing Shell
Cyrtopleura costata
sedimentary
Fossilized Blastoid
Pentremites (Class Blastoidea)
sedimentary
Fossiliferous Limestone Pebble
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Fossiliferous Limestone (Crinoidal Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous limestone (likely crinoidal or shell limestone)
Calcite-rich limestone; predominantly CaCO₃, with visible fossil fragments
fossil
Fossiliferous Limestone
Limestone (CaCO3 with Limonite/Goethite staining)
sedimentary
Ferruginous Sandstone
Ferruginous Quartz-Arenite
sedimentary
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Sandstone
Arenite
sedimentary
Amber
Succinite (Resinite)
fossil
Crinoid Stem Fossil in Chert
Crinoid columnal ossicles (phylum Echinodermata) embedded in microcrystalline quartz (chert)
fossil
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary