Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Sedimentary (Fossil)
Browse sedimentary (fossil) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 dominant)
sedimentary
Limestone with Algal/Lichen Colonization
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Sandstone (with Iron Staining)
Arenite (SiO2 predominantly)
sedimentary
Fossiliferous Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Ammonite fossil
Ammonoidea (likely an involute ammonite; exact genus requires preparation and context)
fossil
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class), often found as calcitic fossils
sedimentary
Weathered limestone
Calcitic limestone, mainly calcium carbonate (CaCO₃)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (with Arkose characteristics)
Clastic sedimentary rock (SiO2 with KAlSi3O8)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Coral
Rugose coral / Tabulate coral fossil in limestone matrix
fossil
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Fossilized Shark Tooth
Carcharocles or Otodus sp. (Micro-fossilized)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Belemnoidea (Belemnite) Fossil
Belemnoidea (order), typically within the genus Belemnitida
fossil
Petrified Wood
Silicified wood (primarily Quartz, SiO2)
fossil
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (likely Quartzose)
Arenite (SiO2 principal mineral)
sedimentary
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
sedimentary
Limestone with Calcite Veining
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Conglomerate
Clastic Sedimentary Rock
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with marine fossils
sedimentary
Fossiliferous Limestone
Carbonate Sedimentary Rock (primarily CaCO3)
sedimentary
Coal (Bituminous or Anthracite)
Carbonaceous sedimentary rock (primarily Carbon, C)
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone
sedimentary
Fossilized Shark Tooth (Carcharocles/Otodus or Sand Tiger Shark Tooth)
Elasmobranchii (Fossilized Tooth)
fossil
Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
sedimentary
Fossiliferous Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Fossilized Echinoid / Sea Urchin Internal Mold
Echinoidea internal cast (steinkern)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Shale with Coprolite influence
Argillaceous sedimentary rock (Shale/Mudstone)
sedimentary
Weathered limestone fragments
Limestone, primarily calcite (CaCO₃)
sedimentary
Coquina / Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Sandstone (with potential Concretion or Fossil fragment)
Arenite (primarily SiO2)
sedimentary
Coal
Coal (Combustible sedimentary rock)
sedimentary