Limestone Cobble
Sedimentary Limestone (CaCO3)
sedimentary
Category
Sedimentary (Fossil)
Browse sedimentary (fossil) specimens identified by the Rock Identifier community.
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Brown Quartz (Jasper or Chert)
Silicon Dioxide (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Anthracite Coal
Anthracite (Carbon based fossil fuel)
metamorphic
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Limestone
Calcite rock (CaCO3)
sedimentary
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Mammoth or Mastodon Tooth Fossil
Mammuthus / Mammut tooth
fossil
Mammoth Molar Fossil
Mammuthus primigenius (Tooth fragment)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Fossilized Shark Tooth
Elasmobranchii (tooth fossil, composed mainly of Bioapatite / Calcium Phosphate)
fossil
Peanut Wood
Petrified Wood (Silicified Araucaria with Teredo boreholes)
fossil
Crinoid Stem Fragment
Crinoid (Class Crinoidea)
fossil
Agate with Fossil/Inclusion
Silicon Dioxide (SiO2) with chalcedony and potential fossil inclusion
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Siltstone
Siltstone (composed of clastic quartz and feldspar)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Flint / Chert
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Sandstone (with ripple marks)
Arenite (SiO2 primarily)
sedimentary
Iron-stained limestone or coral fragment
Calcite-rich carbonate rock; chiefly CaCO₃ (exact identification is uncertain from the image)
sedimentary
Ferruginous Sandstone (Gritstone)
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3 and FeO(OH))
sedimentary
Chert (River Pebble)
Chert (Silicon Dioxide, SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Chert Pebble (Jasper/Quartz variety)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Chert (with Fossiliferous Silicification)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Limestone (specifically Fossiliferous or Crinoidal Limestone)
Calcium Carbonate (CaCO3) - Calcite Rock
sedimentary
Likely tumbled sandstone or limestone
Quartz-rich sandstone (possibly calcarenite/limestone)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Brain Coral Fossil
Family Mussidae or Merulinidae (Order Scleractinia)
sedimentary
Crinoid Fossil in Limestone
Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)
sedimentary
Fossiliferous Limestone with Brachiopod Mold
Calcium Carbonate (CaCO3) matrix containing Brachiopoda fossil impressions
sedimentary
Sandstone (lithic/arkosic)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Red)
Arenite (composed primarily of SiO2)
sedimentary
Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
sedimentary
Petrified Wood
Silicified Wood / Fossilized Wood (SiO2)
sedimentary