Mineralized Fossil

Mammoth molar tooth fossil

Mammuthus sp.; fossilized molar with enamel plates and dentine

Polished fossilized wood

Silicified wood (petrified wood), commonly quartz/chalcedony replacing wood

Fossilized bivalve shell fragment

Calcitic fossil shell, likely a pectinid or related bivalve; CaCO₃

Crinoid Stem Fossil

Class Crinoidea (Echinodermata)

Ammonite fossil in matrix

Fossilized ammonoid cephalopod; likely an ammonite such as Dactylioceras or a related Jurassic taxon

Fossil ammonite fragment

Ammonoidea; likely a partial planispiral ammonite shell, commonly preserved as calcite or replaced limestone

Fossil bone fragment, likely vertebrate limb or rib bone

Fossilized bone (apatite-rich hydroxyapatite, Ca₅(PO₄)₃OH); exact taxon indeterminate

Fossilized mammalian tooth fragment

Likely a fossil molar or premolar; exact taxon cannot be determined from the image

Fossil ammonite or gastropod cast

Ammonoidea or fossil gastropod; exact identification requires clearer details

Fossil scallop/bivalve shell

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

Fossil-bearing sandstone or mudstone

Indeterminate sedimentary matrix with a possible bivalve or shell fossil

Polished fossil ammonite pendant

Ammonite fossil, commonly a heteromorph or planispiral ammonoid; chamber walls are calcite-replaced aragonite

Polished fossil ammonite

Ammonite cephalopod fossil, likely an ammonite mold/cast in calcite or aragonite-derived mineralization

Coral fossil (likely fossilized reef coral)

Calcitic coral; commonly fossilized Scleractinia or related colonial coral

Petoskey Stone (Fossilized Coral)

Hexagonaria percarinata

Sand Dollar (Fossilized or Calcium Carbonate Skeleton)

Clypeasteroida (Order)

Fossilized ammonite (likely weathered ammonite cross-section)

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

Petrified wood

Silicified fossil wood, commonly quartz/chalcedony (SiO₂) replacing woody tissue

Echinoidea (Fossil Sea Urchin)

Echinodermata Echinoidea

Fossil brachiopod shell

Brachiopoda; exact genus/species indeterminate

Fossil shell fragment

Likely a fossilized bivalve or brachiopod valve; exact identification requires the other valve, locality, and matrix

Fossilized shell fragment, likely bivalve

Bivalvia indet.; commonly preserved as calcite (CaCO₃) shell material

Fossilized coral with attached shell

Likely fossil coral (Scleractinia or Tabulata), with a bivalve or gastropod shell; exact identification requires microscopy

Fossil scallop shell

Fossilized bivalve mollusk; likely Pectinidae or a related pectinid

Fossil gastropod shell

Fossilized gastropod, likely a small marine snail; exact genus cannot be determined from the image

Polished fossil coral

Fossilized coral, commonly agatized coral (silica replacing CaCO₃)

Fossil ammonite fragment

Ammonoidea (likely a Jurassic–Cretaceous ammonite)

Fossil shark tooth

Likely a fossilized shark tooth, possibly Carcharhinus or a related requiem shark; exact species is indeterminate from the image.

Fossil gastropod shell

Fossilized gastropod; likely a spiral marine snail, taxonomic identification uncertain from the image

Likely fossilized coral fragment

Rugose or tabulate coral fossil; exact taxon indeterminate

Fossilized bivalve or ammonite fragment

Calcareous fossil; likely a mollusk shell preserved as calcite (taxonomic identification uncertain)

Fossil brachiopod shell

Indeterminate articulate brachiopod; possibly a terebratulid or rhynchonellid

Fossil crocodilian skull and jaws

Crocodyliform fossil; exact genus and species cannot be determined from the image

Fossil shark tooth in limestone

Selachii indet.; calcitic fossil embedded in carbonate rock

Ammonite Fossil

Ammonoidea

Fossilized Brachiopod

Phylum Brachiopoda (likely Order Spiriferida or Orthida)

Fossil brachiopod or bivalve shell

Likely a fossilized brachiopod; precise genus cannot be determined from the photograph

Fossilized ammonite

Ammonoidea (likely a heteromorph or heavily weathered ammonite); preservation may be calcitic replacement

Fossilized wood (petrified wood)

Silicified fossil wood; commonly quartz/chalcedony (SiO₂) replacing wood

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

Rugosa (Order) / Calcite (CaCO3)

Petrified wood

Silicified wood, commonly quartz or chalcedony (SiO₂) replacing ancient wood

Petrified wood

Silicified wood, commonly quartz/chalcedony (SiO₂) replacing wood tissue