Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Category
Fossil
Browse fossil specimens identified by the Rock Identifier community.
Crinoid Stem Fossil in Limestone
Crinoidea (class) in Calcium Carbonate (CaCO3) matrix
fossil
Echinoid Fossil (Commonly called a Sea Urchin or Heart Urchin)
Phylum Echinodermata, Class Echinoidea
sedimentary
Fossil Coral
Rugosa or Tabulata coral fossil (Calcium Carbonate, CaCO3)
fossil
Fossil Coral
Hexagonaria (or Rugose/Tabulate coral fossilized in calcium carbonate)
fossil
Orthoceras Fossil
Orthoceras regulare (Class Cephalopoda, Order Orthocerida)
fossil
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Crinoid Stem Fossil
Crinoid ossicle / stalk segment (Phylum Echinodermata)
fossil
Stromatolite
Biogenic sedimentary rock / Stromatolite
sedimentary
Fossiliferous Limestone Pebble
Calcite-rich Fossiliferous Marine Limestone
fossil
Coprolite
Coprolite
sedimentary
Fossilized bone or tooth fragment
Indeterminate fossil bone; possibly mammalian or reptilian
fossil
Dinosaur Bone (Gembone)
Agatized Dinosaur Bone (Silicified Paleo-osteoid)
metamorphic
Agatized fossil fragment, possibly silicified coral
Chalcedony (microcrystalline SiO₂) replacing carbonate fossil material
fossil
Fossilized bivalve shell fragment
Pectinid or related scallop bivalve; shell originally composed mainly of calcite (CaCO₃)
fossil
Seashell Fossil
Invertebrate fossil (phylum Mollusca)
fossil
Fossil Coral
Rugosa or Tabulata coral fossil
fossil
Likely limestone or calcareous fossil fragment
Calcite-rich carbonate rock; possibly bioclastic limestone (CaCO₃)
sedimentary
Crinoid Fossil in Limestone
Crinoid columnal (Class Crinoidea) in biomicrite
fossil
Fossiliferous Limestone
Biogenic Sedimentary Rock / CaCO3 with fossil fragments
sedimentary
Fossilized Shark Tooth
Otodus sp. (approximate genus) / Hydroxyapatite fossil
sedimentary
Fossil shell fragment (likely brachiopod or bivalve)
Indeterminate fossilized carbonate shell; likely Brachiopoda or Bivalvia
fossil
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)
fossil
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
Likely petrified wood
Silicified wood, chiefly microcrystalline quartz (SiO₂)
fossil
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with marine fossils
sedimentary
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Fossilized Coral
Rugose coral / Tabulate coral (Calcium carbonate, CaCO3)
fossil
Fossil shark tooth
Likely a fossilized shark tooth, possibly *Carcharodon* or *Carcharhinus*; exact species requires provenance and close examination
fossil
Petrified Coral Fossil
Rugose or Tabulate Coral (Hexagonaria or similar fossilized cnidarian)
fossil
Fossiliferous Limestone with Fossil Fragment
Fossiliferous Limestone (CaCO3 with organic remains)
fossil
Crinoid Stem Fossil
Crinoid ossicle (phylum Echinodermata)
fossil
Crinoid Stem Fossil
Crinoid (Class Crinoidea)
fossil
Crinoid Stem Fossil
Class Crinoidea (Sea Lilies)
sedimentary
Crinoid Stem Fossil
Crinoid ossicle (Phylum Echinodermata)
fossil
Horn Coral Fossil
Rugose coral (Order Rugosa)
fossil
Fossil Shell (Bivalve)
Phylum Mollusca, Class Bivalvia
fossil
Petrified Wood
Silicified wood (primarily quartz replacing organic cellulose)
fossil
Fossiliferous Limestone
Biogenic Sedimentary Rock (CaCO3)
sedimentary
Echinoid Fossil (Fossilized Sea Urchin)
Echinoidea
fossil
Fossil Coral (Rugose / Horn Coral)
Rugosa (Tetracoralla)
fossil
Fossilized Stingray Mouth Plate
Myliobatidae gen. et sp. indet. (e.g., Myliobatis, Aetobatus)
fossil