Mineralized Fossil

Fossilized bone, likely a tooth or jaw fragment

Mineralized vertebrate bone; taxonomic identification requires clearer diagnostic anatomy

Fossilized shell fragment

Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment

Coral Skeleton / Fossil Coral

Scleractinia (Aragonite, CaCO3)

Fossilized Crinoid Stem in Pebble

Crinoidea (Class) preserved in calcite/matrix

Fossilized tooth, likely mammalian molar

Indeterminate Mammalia; mineralized dentine and enamel

Favosites Fossil (Honeycomb Coral)

Favosites goldfussi / Order Tabulata

Fossil scallop/bivalve shell

Fossilized pectinid bivalve; likely family Pectinidae (exact genus/species cannot be determined from the image)

Fossilized Ray Barb (Stinger) Fragment

Myliobatiformes indet. (Fossil stingray spine)

Petrified Wood

Silicified Wood (SiO2)

Fossil shark tooth

Likely Otodus megalodon (species identification uncertain from image)

Fossilized Crinoid Stem Segment

Crinoid (Phylum Echinodermata, Class Crinoidea)

Fossil gastropod shell

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

Fossilized Shark Tooth (Otodus obliquus)

Otodus obliquus (Mineralized Apatite / Bio-apatite)

Slate with Fossiliferous Impressions

Metamorphosed Argillaceous Rock (Fossiliferous Slate)

Fossil Sea Urchin (Echinoid)

Echinoidea fossil (often replaced by silica or calcite)

Ammonite Fossil

Ammonoidea (subclass)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Megalodon Shark Tooth

Otodus megalodon

Fossil shark teeth

Likely fossilized shark teeth, possibly Carcharhiniformes or related sharks; exact species cannot be determined from the photo.

Fossil-bearing sedimentary rock, possibly fossil wood or bone

Indeterminate silicified/carbonate fossil in sandstone or mudstone

Crinoid Stem Fossil

Crinoid Columnal (Phylum Echinodermata)

Fossilized bivalve or brachiopod shell

Indeterminate calcitic shell fossil; likely Bivalvia or Brachiopoda

Weathered agate or chalcedony nodule

Microcrystalline quartz (SiO₂), likely agate/chalcedony with iron-oxide staining

Fossil brachiopod shell

Likely spiriferid or strophomenid brachiopod; calcium carbonate (primarily calcite)

Crinoid Stem Fossil

Class Crinoidea (Echinodermata)

Fossilized coral (likely honeycomb or branching coral)

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

Fossil Coral (Petoskey Stone or Chain Coral Pebble)

Hexagonaria percarinata / Rugosa coral (CaCO3)

Spinosaurus fossil (permineralized bone)

Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)

Petoskey Stone (Fossilized Coral)

Hexagonaria percarinata

Fossilized ammonite (likely weathered ammonite cross-section)

Ammonoidea; commonly Jurassic–Cretaceous ammonite fossils replaced by calcite or aragonite

Sand Dollar (Fossilized or Calcium Carbonate Skeleton)

Clypeasteroida (Order)

Fossil Shark Tooth

Carcharocles (Otodus) sp. or similar fossilized Chondrichthyes tooth

Polished ammonite fossil

Ammonoidea; likely a polished, chambered ammonite such as Acanthoceras or related Cretaceous form

Fossil Coral (Rugose Coral / Horn Coral Cross-Section)

Rugosa (Order) / Calcite (CaCO3)

Fossilized Brachiopod

Phylum Brachiopoda (likely Order Spiriferida or Orthida)

Fossilized coral or porous marine limestone

Likely fossil coral (Scleractinia), composed mainly of calcite/aragonite (CaCO₃)

Brachiopod Fossil in Matrix

Phylum Brachiopoda

Fossiliferous Limestone

Sedimentary rock containing Indeterminate Fossil remains (likely Crinoid stem or Bryozoan fragment)

Fossil bivalve shell

Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features

Fossil shark teeth

Likely fossilized shark teeth; exact species indeterminate from the image, possibly Carcharhiniformes or related taxa

Fossilized oyster or bivalve shell

Fossil Gryphaeidae or Ostreoidea; calcitic shell, CaCO₃

Fossilized tooth, likely a mammalian tooth fragment

Indeterminate fossil tooth; possibly an ungulate or carnivoran tooth