Small marine shell fragment
Calcareous shell, primarily calcium carbonate (aragonite or calcite); exact taxon indeterminate
fossil
Category
Fossil
Browse fossil specimens identified by the Rock Identifier community.
Fossiliferous Limestone
Fossiliferous Carbonate Rock (CaCO3)
sedimentary
Seashell (Cone Snail Shell)
Conus sp. (Calcium Carbonate, CaCO3)
fossil
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (SiO2 with Fe2O3)
sedimentary
Sandstone Pebbles
Arenite
sedimentary
Sandstone (with Iron Staining)
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Coarse Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Shark Tooth Fossil
Carcharocles megalodon or similar extinct shark tooth
fossil
Fossilized Coral (Petoskey-like or Favosites)
Anthozoa (Fossilized Coral)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Tumbled amber-like gemstone
Likely amber (fossilized resin; organic mineraloid), possibly citrine or yellow-brown glass imitation
gemstone
Petrified wood
Silicified wood; commonly quartz (SiO₂) replacing wood tissue
fossil
Possible fossilized shell or coral fragment
Indeterminate biogenic carbonate, likely calcite (CaCO₃)
fossil
Likely petrified wood or silicified fossil fragment
Silicified wood; predominantly microcrystalline quartz (SiO₂)
fossil
Coal
Coal (Combustible sedimentary rock)
sedimentary
Sandstone with Quartz Vein
Quartz-cemented quartz arenite
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Coal (Bituminous / Anthracite)
Carbonaceous Sedimentary Rock (C)
sedimentary
Fossilized Horn Coral
Rugosa (Rugose Coral)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Favosite Fossil (Calyx or Rugose Coral)
Favosites (Extinct Tabulate Coral)
sedimentary
Dinosaur Bone (Gembone)
Petrified Dinosaur Bone (Apatite/Silica replacement)
sedimentary
Gastropod Fossil (Snail Internal Mold)
Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Fossilized Coral (Petoskey Stone / Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Petrified Wood
Silicon Dioxide (SiO2) - Calcified / Silicified Wood
sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites (Extinct genus of Tabulate Coral)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
mineral
Horn Coral Fossil
Rugosa (Order Rugosa)
sedimentary