Organic Specimen (Fossil)

Dendritic Agate (Tree Agate)

Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions

Agatized fossil nodule, possibly silicified wood or bone

Microcrystalline quartz (chalcedony), SiO₂, replacing fossil material

Petrified Wood Agate

Silicified Wood (primarily SiO2)

Fossil tooth fragment

Likely fossilized shark tooth or marine vertebrate tooth; exact taxon cannot be determined from the image

Fossilized wood (petrified wood)

Silicified fossil wood; commonly quartz (SiO₂) replacing wood tissues

Fossil-bearing ironstone or weathered concretion

Indeterminate; likely ferruginous sandstone/concretion containing a partial fossil impression

Fossilized Horse Tooth

Equus sp. (fossilized molar)

Fossiliferous Limestone

Limestone with embedded fossil cross-section

Fossiliferous limestone pebble

Micritic to bioclastic limestone, composed mainly of calcite (CaCO₃)

Coal (Bituminous / Anthracite)

Organic Sedimentary Rock (Carbonaceous Rock)

Crinoid Fossil in Limestone

Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)

Petrified Wood

Silicified wood (primarily SiO2)

Polished fossiliferous limestone (likely crinoidal or coral limestone)

Bioclastic carbonate rock, chiefly calcite (CaCO₃)

Fossiliferous Rock (likely Dinosaur Fossil in Matrix)

Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)

Fossil Shark Tooth

Elasmobranchii (Class) fossil - possibly Odontaspididae family

Fossilized bivalve shell

Paleozoic–Mesozoic bivalve fossil; commonly classified as Bivalvia indet.

Coral Fossil (Hexagonaria)

Hexagonaria sp. (Silica-replaced)

Petrified Wood

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Fossilized bone fragment

Petrified vertebrate bone; mineralized hydroxyapatite replaced or infilled by silica/carbonates

Fossiliferous Rock (Invertebrate Fossil in Matrix)

Fossiliferous limestone or shaly matrix containing skeletal fossil remains

Petrified Wood

Silicified Wood (SiO2)

Fossilized Dinosaur Skull (Tyrannosaurus rex)

Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica

Flower Jasper

Agatized Fossil Coral / Chalcedony (SiO2)

Petrified Wood

Silicified wood (Quartz/Chalcedony/SiO2)

Fossilized coral (likely honeycomb or branching coral)

Fossil coral; probable Scleractinia or Tabulata, composition mainly microcrystalline CaCO₃

Tumbled fossiliferous limestone

Micritic limestone, likely bioclastic/fossiliferous carbonate rock (predominantly CaCO₃)

Megalodon Shark Tooth

Otodus megalodon

Fossilized Shark Tooth (Partial) or Coprolite

Elasmobranchii (fossil) or Coprolite (trace fossil)

Fossilized Shark Tooth

Selachimorpha fossil

Chert (containing small fossils)

Chert (Microcrystalline Quartz, SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (Permineralized organic matter, głównie $SiO_2$)

Fossiliferous Sandstone

Sedimentary rock containing invertebrate fossils

Petrified Wood

Silicified Wood / Chalcedony (SiO2)

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

Fossilized wood (petrified wood)

Silicified permineralized wood, commonly quartz (SiO₂) replacing or infilling woody tissue

Fossilized Wood (Petrified Wood)

Agatized wood (primarily SiO2)

Shark Tooth Fossil

Otodus sp. (possibly Cretalamna)

Fossiliferous Limestone (Crinoidal)

Calcium Carbonate (CaCO3) - Limestone containing bioclasts

Chert (Field Pebble)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous Limestone

CaCO3 (principally Calcite or Aragonite)