Petrified Wood
Silicified Wood (SiO2)
sedimentary
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
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Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
sedimentary
Mammoth Tooth
Mammuthus primigenius (Tooth fragment)
fossil
Possible fossilized ammonite or concretion
Indeterminate fossil specimen; possibly an ammonoid mold/cast in iron-rich sedimentary rock
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossiliferous Limestone (Coral Fossil)
Scleractinian Coral in Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Fossil Shark Tooth
Carcharodon carcharias (modern/recent) or similar Lamniform fossil
fossil
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with fossil inclusions
sedimentary
Fossiliferous Limestone (Gritstone/Marl)
CaCO3 (Calcium Carbonate) with Fossil Inclusions
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert Nodule (Fossiliferous Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Carbonate sedimentary rock with trace fossils (CaCO3)
sedimentary
Dinosaur Claw Fossil
Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement) SiO2
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
fossil
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Fossilized Horse Tooth
Equus sp. (fossilized molar)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Petrified Wood
Silicified wood (principally SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Petrified Wood Agate
Silicified Wood (primarily SiO2)
fossil
Megalodon Shark Tooth
Otodus megalodon
fossil
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
Amber
Succinite (fossilized tree resin)
fossil
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Fossil-bearing ironstone or weathered concretion
Indeterminate; likely ferruginous sandstone/concretion containing a partial fossil impression
fossil
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Coral Fossil (Hexagonaria)
Hexagonaria sp. (Silica-replaced)
fossil
Chert Pebble with Inclusion
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Chert (Fossiliferous)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Paleoxylon (SiO2)
fossil
Sand Tiger Shark Tooth Fossil
Carcharias taurus (fossilized tooth)
fossil
Chert (River Pebble)
Chert (Silicon Dioxide, SiO2)
sedimentary
Dinosaur Fossil (Skull)
Dinosauria fossilis (Petrified Hydroxyapatite / Calcium Carbonate)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony/SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary