Sandstone
Arenite (SiO2 primarily)
sedimentary
Category
Mineralized Fossil
Browse mineralized fossil specimens identified by the Rock Identifier community.
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Sandstone (Quartzose)
Arenite (Siliciclastic sedimentary rock)
sedimentary
Sandstone (likely Arkosic)
Arenite (SiO2 based)
sedimentary
Bivalve Fossil (Fossilized Shell)
Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)
fossil
Fossilized Tiger Shark Tooth
Galeocerdo cuvier (fossilized hydroxylapatite)
sedimentary
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
sedimentary
Fighting Conch (Sea Shell)
Strombus alatus (primarily composed of Calcium Carbonate / CaCO3)
mineral
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil
Fossiliferous Limestone / Fossil Fragment
Calcium Carbonate (CaCO3) with indeterminate biogenic remains
fossil
Granite Cobble
Phaneritic Plutonic Felsic Rock
igneous
Fossil Brachiopod Cast (Atrypa species)
Phylum Brachiopoda, Class Rhynchonellata, Order Atrypida
sedimentary
Asphalt (Bituminous Rock)
Natural bitumen or Bituminous limestone/sandstone
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Fossil Shark Tooth
Lamniformes (order) - likely Cretalamna or Carcharias species
fossil
Fossil Coral (Favosites Honeycomb)
Favosites (Genus), Phylum Cnidaria, Class Anthozoa
sedimentary
Fossiliferous Limestone
Biogenic Limestone containing marine invertebrate fossils
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with fossil inclusions
sedimentary
Fossil Shark Tooth
Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna
fossil
Petrified Wood
Silicified wood / Xylopal
fossil
Petrified Wood
Silicified wood (permineralized wood)
fossil
Petrified Wood
Silicified wood (Quartz / Chalcedony replacement of organic cellulose)
fossil
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Petrified Wood
Silicified Wood (mainly Quartz / SiO2)
fossil
Belemnite Fossil
Belemnitida (Order of extinct cephalopods)
sedimentary
Murex Fossil
Muricidae (Calcium Carbonate fossilization)
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Fossilized Bivalve Shell (Fossilized Clam)
Bivalvia (class) / CaCO3 (Calcium Carbonate)
fossil
Turritella Agate / Fossiliferous Limestone
Elimia tenera (commonly mislabeled as Turritella in chalcedony/calcite matrix)
fossil
Fossilized Gastropod Shell
Gastropoda (Fossilized internal mold or shell body)
fossil
Rugose Coral Fossil
Order Rugosa
fossil
Coal
Bituminous Coal / Anthracite
sedimentary
Lepidodendron Fossil (Scale Tree)
Lepidodendron
fossil
Coal
Bituminous Coal / Anthracite
sedimentary
Fossilized Coral
Rugosa or Tabulate Coral Fossil (Replacement by Silica/Calcite)
fossil
Fossilized Coral
Rugose coral / Tabulate coral fossil in limestone matrix
fossil
Fossilized Sand Dollar
Echinoidea (Clypeasteroida)
fossil
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Ammonite Fossil (Iridiscent)
Ammonoidea (subclass)
fossil