Petrified Wood
Silicified Wood (Permineralized organic matter, głównie $SiO_2$)
fossil
Category
Organic Specimen (Fossil)
Browse organic specimen (fossil) specimens identified by the Rock Identifier community.
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Chert (v. Flint)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Fossil Shark Tooth
Elasmobranchii (Class) fossil - possibly Odontaspididae family
fossil
Fossilized coral (likely honeycomb or branching coral)
Fossil coral; probable Scleractinia or Tabulata, composition mainly microcrystalline CaCO₃
fossil
Fossiliferous Shale
Laminated Mudrock with plant fossils
sedimentary
Petrified Wood
Silicified wood (primarily Quartz/Chalcedony, SiO2)
metamorphic
Chert Pebble (Jasper/Quartz variety)
Microcrystalline Quartz (SiO2)
sedimentary
Gastropod Fossil (Snail Steinkern)
Class Gastropoda (internal mold)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossiliferous Rock (likely Dinosaur Fossil in Matrix)
Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Fossilized Wood (Petrified Wood)
Agatized wood (primarily SiO2)
fossil
Shark Tooth Fossil
Otodus sp. (possibly Cretalamna)
fossil
Fossiliferous Limestone (Crinoidal)
Calcium Carbonate (CaCO3) - Limestone containing bioclasts
sedimentary
Petrified Wood
Silicified Wood / Chalcedony (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2-dominant)
fossil
Fossilized Megalodon Tooth Fragment
Otodus megalodon (Carcharocles megalodon fossil)
sedimentary
Flint with Fossil Inclusion
Cryptocrystalline quartz (SiO2) enclosing fossilized organic remains
sedimentary
Dinosaur Bone (Gembone)
Silicified Dinosaur Bone (SiO2 replacing organic tissue)
sedimentary
Petrified Wood with Lichen
Silicified Wood (SiO2) colonized by crustose lichens
fossil
Chert (Field Pebble)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Shale or Siltstone
Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Chert (containing small fossils)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Fossiliferous Limestone
CaCO3 (principally Calcite or Aragonite)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda embedded in sedimentary rock
fossil
Chert (Iron-stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Coal (Bituminous / Anthracite)
Organic Sedimentary Rock (Carbonaceous Rock)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Fossil Crab
Decapoda (likely Avitelmessus or Raninidae family)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Flower Jasper
Agatized Fossil Coral / Chalcedony (SiO2)
sedimentary
Fossiliferous Limestone
Limestone with embedded fossil cross-section
sedimentary