Mineralized Fossil

Likely fossil shell fragment

Indeterminate mollusk fossil; possibly a gastropod or bivalve in limestone

Shark Tooth Fossil

Carcharodonta (order Lamniformes), likely Carcharias spp.

Fossilized bone fragment (probable mammalian tooth or bone)

Mineralized bone, commonly hydroxyapatite [Ca5(PO4)3(OH)] replaced or impregnated by silica/calcite

Fossil tooth, possibly shark tooth

Indeterminate fossilized vertebrate tooth; likely a shark tooth (possibly *Carcharhinus* or related genus)

Polished fossil coral (likely fossilized honeycomb or tabulate coral)

Fossilized tabulate coral; commonly Favosites or related genera, preserved mainly as calcite (CaCO₃)

Fossil shell fragment

Likely fossilized bivalve or brachiopod; exact taxon indeterminate from the image

Fossilized gastropod (likely nerite or related sea snail)

Gastropoda; shell composed originally of aragonite/calcite, commonly replaced or infilled by calcite

Fossil bone, possibly a large mammal long-bone fragment

Fossilized cortical bone; taxon indeterminate from the photograph

Fossil shark tooth, likely megalodon

Fossilized shark tooth; possibly Otodus megalodon (formerly Carcharocles megalodon)

Fossilized Shark Tooth in Matrix

Otodus sp. (likely Otodus obliquus)

Fossil Shark Tooth

Carcharocles (Otodus) sp. or similar fossilized Chondrichthyes tooth

Fossilized shell

Indeterminate bivalve shell; likely calcitic or aragonitic shell material (CaCO₃)

Polished fossil coral fragment

Fossilized colonial coral, commonly Favosites or related tabulate coral

Fossil bivalve impression in chert or siliceous limestone

Likely fossilized bivalve mold/cast; host possibly silicified limestone or chert

Fossil brachiopod or bivalve shell

Indeterminate fossilized shell; likely a ribbed brachiopod (Order Productida or Spiriferida)

Fossilized bone fragment (probable large mammal limb bone)

Mineral-replaced or permineralized bone; exact taxon cannot be determined from the image

Fossilized Coral

Hexagonaria (Rugose coral) / Calcium Carbonate (CaCO3)

Fossil bivalve shell

Fossilized mollusk (Bivalvia), likely oyster or related species; exact genus requires locality and preparation

Fossil Sea Urchin (Echinoid)

Echinoidea fossil (often replaced by silica or calcite)

Fossil coral fragment

Likely calcitic colonial coral, possibly fossilized scleractinian coral

Fossilized bone or tooth fragment

Mineralized vertebrate bone; exact taxon indeterminate from image

Fossilized bone fragment (tentative)

Petrified bone; mineral replacement commonly by microcrystalline quartz, calcite, or iron oxides

Megalodon Shark Tooth Fossil

Otodus megalodon

Fossil tooth, likely mosasaur or large marine reptile tooth

Fossilized reptilian tooth; exact taxon requires diagnostic views and locality

Fossil gastropod shell

Fossilized marine gastropod; exact genus/species requires locality and examination

Fossil shell fragment

Likely a fossilized brachiopod or bivalve; exact taxon cannot be determined from the image

Megalodon Shark Tooth

Otodus megalodon

Fossil gastropod shells

Fossilized marine gastropods; likely internal or external casts of coiled mollusks (Gastropoda)

Fossilized coral or bryozoan fragment

Indeterminate colonial coral/bryozoan fossil; likely calcitic calcium carbonate (CaCO₃)

Fossilized shell fragment

Likely calcitic or aragonitic bivalve/gastropod shell; exact taxon indeterminate

Polished carved coral fossil (likely agatized or silicified coral)

Fossilized colonial coral; commonly *Scleractinia* or *Tabulata*, replaced by chalcedony/microcrystalline quartz

Fossilized bivalve shell

Indeterminate fossil mollusk; likely a brachiopod or bivalve, originally calcite/aragonite (CaCO₃)

Fossil brachiopod or bivalve shell

Indeterminate fossilized carbonate shell; possibly a brachiopod (Brachiopoda)

Fossil gastropod (snail shell)

Gastropoda; likely a small spiral shell preserved/replaced by calcium carbonate

Fossil bivalve shell

Fossilized marine bivalve; exact genus/species indeterminate from the photograph

Fossilized bivalve shell

Bivalvia indeterminate; likely a fossil clam or cockle

Fossil shark tooth, likely megalodon

Otodus megalodon (formerly Carcharocles megalodon), fossilized tooth

Fossilized Crinoid Stem Segment

Crinoid (Phylum Echinodermata, Class Crinoidea)

Likely polished/tumbled fossil shell or concretion

Indeterminate; possibly a fossil bivalve or gastropod in mineralized matrix

Fossilized Crinoid Stem in Pebble

Crinoidea (Class) preserved in calcite/matrix

Fossilized shell or bone fragment

Likely bioclast composed mainly of calcium carbonate (calcite/aragonite); exact organism is indeterminate from the image

Fossilized wood (petrified wood)

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