Oyster shell fragment
Ostreidae shell; primarily calcite (CaCO₃)
fossil
Category
Sedimentary (Fossilized)
Browse sedimentary (fossilized) specimens identified by the Rock Identifier community.
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Fossilized Coral (Favosites)
Favosites goldfussi / Tabulata
sedimentary
Fossilized Horn Coral
Order Rugosa (Rugose Coral)
sedimentary
Fossilized Brachiopod Shell
Phylum Brachiopoda (likely Order Spiriferida or Strophomenida)
sedimentary
Fossilized Shark Tooth
Elasmobranchii fossil (likely Odontaspididae family)
sedimentary
Fossilized Gastropod in Limestone
Gastropoda (Class) in Fossiliferous Limestone
sedimentary
Fossilized Coral (Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Fossilized Honeycomb Coral
Favosites (extinct genus of tabulate corals)
sedimentary
Belemnite (Fossilized Rostrum)
Belemnitida (Order), composed of Calcite (CaCO3)
sedimentary
Fossilized Rugose Coral
Rugosa (Order Rugosa, typically fossilized in Limestone)
sedimentary
Fossilized Pycnodonte Oyster
Pycnodonte (Gryphaeostrea) species; Composition is Calcium Carbonate (Calcite/Aragonite)
sedimentary
Fossilized Shark Tooth
Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)
sedimentary
Likely fossil oyster shell
Fossilized bivalve shell; exact species cannot be identified from the image
fossil
Amber
Succinite
Mineraloid
Belemnite Fossil
Belemnitella sp. (rostrum)
fossil
Fossilized bone fragment
Mineralized vertebrate bone, likely mammalian; exact taxon indeterminate
fossil
Fossilized bivalve shell
Paleozoic–Mesozoic bivalve fossil; commonly classified as Bivalvia indet.
fossil
Mosasaur Jaw Fossil in Matrix
Mosasaurus (family Mosasauridae) in Phosphate Sandstone
sedimentary
Fossilized gastropod (likely nerite or related sea snail)
Gastropoda; shell composed originally of aragonite/calcite, commonly replaced or infilled by calcite
fossil
Seashell Fossil
Mollusca (Bivalvia)
fossil
Sandstone
Arenite (SiO2 primarily)
sedimentary
Zebra Rock (Zebra Stone / Ribbon Stone)
Siltstone with Ferruginous Banding (Primarily Quartz, Kaolinite, and Hematite)
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite/Hematite and Chert)
sedimentary
Fossiliferous Limestone
Limestone with embedded fossil cross-section
sedimentary
Bryozoan Fossil
Phylum Bryozoa (commonly known as 'moss animals')
sedimentary
Fossilized Coral (Petoskey Stone or similar Favosites)
Hexagonaria percarinata / Favosites (Silurian-Devonian Coral)
sedimentary
Likely quartz-rich stone or shell fragment
Uncertain; possibly quartz (SiO₂) or a calcareous shell fragment (CaCO₃)
mineral
Amber
Succinite (C10H16O)
mineral
Sandstone
Arenite (mainly SiO2 with varying cements)
sedimentary
Fossilized Shark Tooth
Carcharocles sp. or similar Lamniformes
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Petrified Coral Fossil
Rugose or Tabulate Coral (Hexagonaria or similar fossilized cnidarian)
fossil
Chert (or Fossiliferous Limestone)
Microcrystalline Quartz (SiO2) / Calcium Carbonate (CaCO3)
sedimentary
Belemnite Fossil
Belemnitida (extinct order of Cephalopods)
sedimentary
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Petoskey Stone
Hexagonaria percarinata
sedimentary
Orthoceras Fossil Limestone
Orthoceras (extinct genus of cephalopod); Limestone matrix (CaCO3)
sedimentary
Fossil Belemnite Guard
Belemnitella spp. (rostrum)
fossil
Siderite Concretion (Nodule)
Iron Carbonate (FeCO3) Concretion
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Gastropod Steinkern
Class Gastropoda internal mold
fossil