Oyster shell fragment
Ostreidae shell; primarily calcite (CaCO₃)
fossil
Category
Sedimentary (Fossilized Organic Remains)
Browse sedimentary (fossilized organic remains) specimens identified by the Rock Identifier community.
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Picture Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Biggs Jasper (Picture Jasper)
Silicon Dioxide (SiO2) - Opaque Silicified Volcanic Ash
sedimentary
Petoskey Stone
Hexagonaria percarinata
sedimentary
Fossiliferous Limestone
Calcium carbonate (CaCO3) matrix with fossil inclusions
fossil
Fossilized Bone Fragment
Permineralized Skeletal Element (Likely Vertebrate)
sedimentary
Fossil Snail Shell (Embedded in Resin)
Gastropoda fossil
fossil
Fossilized Bone Chunk
Permineralized Vertebrate Bone (indeterminant)
fossil
Ironstone Concretion (Coprolite-like)
Goethite/Hematite Siderite Spheroid (FeCO3 or FeO(OH))
sedimentary
Amber
Succinates (C10H16O)
mineraloid
Fossilized Tabulate Coral
Favosites (Honeycomb Coral)
fossil
Amber
Succinite
Mineraloid
Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)
Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)
sedimentary
Fossilized Horse Tooth
Equus ferus caballus (fossilized molar/premolar)
fossil
Fossilized Fish (Lepidotes)
Lepidotes sp. (Order: Lepisosteiformes)
sedimentary
Augite Shell / Turret Snail Fossil (or Recent Seashell)
Gastropoda (Class) / Turritellidae (Family)
fossil
Likely tumbled amber or orange chalcedony
Uncertain from image; possibly amber (fossilized resin, chiefly C10H16O) or carnelian (microcrystalline quartz, SiO₂)
gemstone
Seashell Fossil
Mollusca (Bivalvia)
fossil
Fossilized Horn Coral
Order Rugosa (Calcium Carbonate - CaCO3)
sedimentary
Petoskey Stone (Fossilized Rugose Coral)
Hexagonaria percarinata (Calcium Carbonate, CaCO3)
sedimentary
Fossilized Gastropod in Limestone
Gastropoda (Class) in Calcium Carbonate (CaCO3)
sedimentary
Septarian Nodule (Dragon Stone)
Septarian concretion (composition: Calcium Carbonate / Calcite, Aragonite, and Limestone/Clay)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary (fossilized)
Murex Fossil
Muricidae (Calcium Carbonate fossilization)
fossil
Petoskey Stone (Fossilized Rugose Coral)
Hexagonaria percarinata
sedimentary
Fossilized Gastropod Internal Mold
Gastropoda (Steinkern fossil)
fossil
Fossilized Oyster Shell
Exogyra or Ostrea (Gryphaeidae/Ostreidae family)
fossil
Fossilized oyster or other bivalve shell
Calcitic bioclast, commonly Ostrea spp. or Exogyra spp.
fossil
Jasper with Manganese Dendrites
Silicon Dioxide (SiO2) with Oxide Mineral Inclusions
sedimentary
Sandstone Cobble with Liesegang Rings
Arenite with iron oxide precipitation (SiO2 matrix with Fe2O3 banding)
sedimentary
Fossilized Shark Tooth
Selachii (Elasmobranchii subclass)
fossil
Fossil Sponge / Horn Coral / Crinoid Stem
Phylum Porifera or Cnidaria fossilized in calcium carbonate / silica
fossil
Amber with Inclusion
Succiniferous fossil resin (C10H16O)
mineraloid
Fossilized Coral (Favosites)
Favosites goldfussi
fossil
Bivalve Fossil (Shell Fragment)
Class Bivalvia (Calcium Carbonate - CaCO3)
sedimentary
Fossilized Sand Dollar
Echinoidea (Clypeasteroida)
fossil
Fossilized Shark Tooth
Fossil Chondrichthyes (various genera such as Carcharias or Odontaspis)
sedimentary
Fossilized Oyster Shell
Gryphaea or Crassostrea fossil (Calcium Carbonate, CaCO3)
sedimentary
Fossilized Brachiopod Shell
Order Spiriferida (likely)
fossil
Fossilized Mosasaur Tooth
Mosasauridae (likely Prognathodon or Mosasaurus)
fossil
Amber
Succinite (C10H16O)
Organic Mineraloid
Fossilized Gastropod Shell
Class Gastropoda (Fossil)
sedimentary