Organic Specimen (Fossil)

Fossil mammalian skull

Fossilized vertebrate bone; exact taxon cannot be determined from the image

Megalodon Shark Tooth

Otodus megalodon

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Fossiliferous Limestone

Carbonate sedimentary rock with trace fossils (CaCO3)

Possible fossilized ammonite or concretion

Indeterminate fossil specimen; possibly an ammonoid mold/cast in iron-rich sedimentary rock

Gastropod Fossil (Snail Steinkern)

Class Gastropoda (internal mold)

Fossilized coral or silicified organic limestone

Likely fossil coral (Scleractinia/Tabulata) replaced or cemented by calcite and silica; exact identification requires close examination

Flint with Fossil Inclusion

Cryptocrystalline quartz (SiO2) enclosing fossilized organic remains

Fossil Shark Tooth

Carcharodon carcharias (modern/recent) or similar Lamniform fossil

Chert (River Pebble)

Chert (Silicon Dioxide, SiO2)

Chert (Fossiliferous)

Silicon Dioxide (SiO2)

Fossilized tooth, likely shark tooth

Fossilized selachian tooth; possibly a worn Otodus or related shark tooth

Calcite-rich limestone or travertine

Calcite, CaCO₃; likely crystalline limestone/travertine with possible aragonite

Sandstone (with carbonaceous plant fragments)

Arenite (composed primarily of SiO2)

Fossilized Megalodon Tooth Fragment

Otodus megalodon (Carcharocles megalodon fossil)

Fossil bone or tooth fragment

Indeterminate fossilized vertebrate bone/tooth; taxonomic identification is not possible from this blurred image

Fossiliferous Limestone (Coral Fossil)

Scleractinian Coral in Calcium Carbonate (CaCO3)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)

Polished agate-like stone (uncertain; possibly a fossil or shell fragment)

Likely microcrystalline quartz (chalcedony), SiO₂; exact identification is limited by the image

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified wood (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert Nodule (Fossiliferous Chert)

Microcrystalline Quartz (SiO2)

Fossilized coral or stromatoporoid fragment

Likely tabulate coral (order Tabulata) or stromatoporoid; exact identification requires microscopy

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossil Crab

Decapoda (likely Avitelmessus or Raninidae family)

Chert (v. Flint)

Sedimentary Cryptocrystalline Quartz (SiO2)

Chert Pebble (Jasper/Quartz variety)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement) SiO2

Amber

Succinite (fossilized tree resin)

Petrified Wood

Silicified wood (primarily SiO2)

Mammoth Tooth

Mammuthus primigenius (Tooth fragment)

Petrified Wood

Silicified wood (principally SiO2)

Petrified Wood

Silicified Paleoxylon (SiO2)

Sand Tiger Shark Tooth Fossil

Carcharias taurus (fossilized tooth)

Fossiliferous Shale

Laminated Mudrock with plant fossils

Chert Pebble with Inclusion

Microcrystalline Quartz (SiO2)

Fossilized wood, likely silicified petrified wood

Silicified wood (fossil wood; commonly quartz/chalcedony replacing organic tissue)