Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
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Limestone (specifically Fossiliferous or Crinoidal Limestone)
Calcium Carbonate (CaCO3) - Calcite Rock
sedimentary
Ammonite Fossil (Iridiscent)
Ammonoidea (subclass)
fossil
Fossiliferous Limestone / Coral Fossil
Fossiliferous Limestone with Anthozoa (Coral) fossil
sedimentary / fossil
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossil Shark Tooth
Carcharocles (Otodus) sp. or similar fossilized Chondrichthyes tooth
sedimentary
Petrified Wood
Silicified wood (primarily quartz replacing organic cellulose)
fossil
Amber and Tumbled Stones
Fossilized Tree Resin (Succinite)
fossil
Amber
Succinite (Resinite)
fossil
Coprolite
Coprolite (fossilized feces)
sedimentary
Polished fossilized wood (likely petrified wood)
Silicified wood; primarily quartz (SiO₂) replacing wood tissue
fossil
Polished septarian nodule slice
Septarian concretion, commonly calcite-filled cracks in a claystone/mudstone matrix (often with aragonite and brown iron oxides)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Coal (likely Bituminous or Lignite)
Organic Sedimentary Rock (Carbonaceous)
sedimentary
Amber
Succinite (Fossilized Tree Resin, C10H16O)
gemstone
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary
Shale
Shale (clay-sized silicate minerals)
sedimentary
Fossiliferous Limestone / Petoskey Stone (Coral Fossil)
Hexagonaria percarinata / Calcite (CaCO3)
fossil
Fossiliferous Limestone (Coquina / Shell Limestone)
Bioclastic Limestone (CaCO3)
sedimentary
Weathered fossil-bearing limestone
Limestone, predominantly calcite (CaCO₃), possibly fossiliferous or brecciated
sedimentary
Fossilized shell or bone fragment
Indeterminate biogenic carbonate/phosphate fossil; likely a fragment of fossil shell or small vertebrate bone
fossil
Fossil Coral
Hexagonaria or similar rugose/tabulate coral fossil (Calcium Carbonate, CaCO3)
fossil
Fossilized bone or tooth fragment
Indeterminate fossil bone; possibly mammalian or reptilian
fossil
Coquina / Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Turtle Stone / Septarian Nodule (Fragment)
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Amber
Succinite (Approximate formula: C10H16O)
Mineraloid
Coral Fossil (Petrified Coral)
Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)
sedimentary
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone with Dendritic Inclusions
Quartzose Sandstone
sedimentary
Silicified fossil shell, likely fossil oyster or clam
Silicified bivalve fossil; shell originally aragonite/calcite, partly replaced by chalcedony (SiO₂)
fossil
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Fossilized Echinoid / Sea Urchin Internal Mold
Echinoidea internal cast (steinkern)
fossil
Weathered fossiliferous limestone
Calcitic limestone, predominantly calcium carbonate (CaCO₃), possibly containing shell or coral fossil fragments
sedimentary
River Pebble (Siltstone/Mudstone)
Clastic sedimentary rock
sedimentary