Limestone pebble
Sedimentary rock, primarily calcium carbonate (CaCO3)
sedimentary
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
mineral
Shark Tooth Fossil
Carcharocles megalodon or similar extinct shark tooth
fossil
Fossilized Shell
Invertebrate fossil (Bivalvia or Brachiopoda)
fossil
Amber
Succiniferous fossil resin (C10H16O)
gemstone
Peanut Wood
Petrified Wood (Silicified Araucaria with Teredo boreholes)
fossil
Fossilized Vertebra
Chordata fossil (Vertebra)
fossil
Fossil crocodilian skull and jaws
Crocodyliform fossil; exact genus and species cannot be determined from the image
fossil
Coral Fossil (Scleractinia)
Scleractinia (Order), primarily CaCO3 (Aragonite or Calcite)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (primarily CaCO3)
sedimentary
Weathered fossil shell fragment
Likely a bivalve or gastropod shell, composed mainly of biogenic calcite/aragonite (CaCO₃)
fossil
Fossiliferous Limestone Pebble
Calcite-rich Fossiliferous Marine Limestone
fossil
Coal (likely bituminous coal)
Bituminous coal; predominantly carbon with organic macerals and minor clay/pyrite
sedimentary
Fossil Shark Tooth
Chondrichthyes tooth fossil
fossil
Polished amber
Fossilized tree resin; chiefly polymerized diterpenoid resin (succinite when Baltic-type)
gemstone
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone
sedimentary
Rounded limestone or dolostone pebble
Calcite-rich limestone (CaCO₃), possibly dolostone (CaMg(CO₃)₂)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossil Coral / Crinoid Stem section
Anthozoa / Crinoidea fossil
fossil
Fossilized Shark Tooth
Lamniformes (order) fossil
fossil
Seashell Fragment
Calcium carbonate (CaCO3) - primarily Aragonite or Calcite
fossil
Fossil Shark Tooth (Sand Tiger Shark type)
Carcharias sp. (likely Odontaspis)
fossil
Dinosaur Bone (Gembone)
Agatized Dinosaur Bone (Silicified Paleo-osteoid)
metamorphic
Fossil Shell (Brachiopod or Mollusk)
Phylum Brachiopoda or Class Bivalvia (e.g., Mucrospirifer or similar genus)
fossil
Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Petrified Wood and Mixed Rocks
Silicified Wood (SiO2)
fossil
Fossil shark tooth
Likely fossilized shark tooth, possibly Carcharhinus or a related requiem shark
fossil
Fossil bivalve shell fragment
Likely a ribbed oyster or scallop-type bivalve; exact genus requires locality and preservation details
fossil
Fossiliferous Limestone
Limestone (Calcium Carbonate) with Fossil Inclusions
sedimentary
Fossil gastropod shell
Gastropoda; species cannot be determined from the image
fossil
Petrified Wood
Silicified Wood (primarily Quartz/SiO2)
fossil
Fossiliferous limestone
Bioclastic limestone, chiefly calcite (CaCO₃)
sedimentary
Petrified Wood
Silicified Wood (SiO2 as Quartz/Chert/Chalcedony)
sedimentary
Fossilized Coral in Chert
Anthozoa (Class) fossil in Cryptocrystalline Quartz (SiO2)
fossil
Ammonite Fossil
Ammonoidea (Calcium carbonate - CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate with Fossils)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Mammoth Tooth
Mammuthus tooth fossil
fossil
Shark Tooth Fossil
Elasmobranchii fossil (likely Carcharias or Odontaspis sp.)
fossil