Bivalve Fossil (Clam)
Class Bivalvia (e.g., Exogyra or Gryphaea species)
fossil
Category
Sedimentary (Fossilized)
Browse sedimentary (fossilized) specimens identified by the Rock Identifier community.
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Favosites (Honeycomb Coral Fossil)
Favosites sp. (Phylum Cnidaria, Order Tabulata)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Fossiliferous limestone
Bioclastic carbonate rock, chiefly calcite (CaCO₃), containing fossil fragments—possibly coral or bryozoan
fossil
Snakeskin Jasper
Microcrystalline Quartz (SiO2) with iron inclusions
sedimentary
Sandstone with Liesegang Rings
Clastic Sedimentary Rock with Iron Oxide Precipitates (SiO2 + Fe2O3)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
Fossil brachiopod
Brachiopoda; likely a spiriferid or strophomenid brachiopod
fossil
Fossil brachiopod or bivalve shell fragment
Likely a fossilized, ribbed brachiopod; exact genus/species cannot be determined from the image
fossil
Fossilized Bivalve Shell
Bivalvia (fossil specimen)
sedimentary
Fossil scallop shell
Bivalvia, likely family Pectinidae; exact species cannot be determined from the image
fossil
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Fossilized Belemnite Rostrum
Belemnitida
fossil
Fossil Sea Urchin (Echinoid)
Echinoidea fossil (often replaced by silica or calcite)
fossil
Weathered fossil shell fragment
Indeterminate bioclastic carbonate, likely molluscan shell (calcium carbonate, commonly aragonite or calcite)
fossil
Bituminous Coal
Coal (Sedimentary Rock)
sedimentary
Cowrie Shell Fossil
Cypraea sp.
fossil
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Amber
Succinite (fossilized tree resin)
mineraloid / sedimentary organic material
Fossil Shark Tooth
Chondrichthyes tooth fossil
fossil
Clam shell (likely a bivalve shell)
Bivalvia; shell composed primarily of calcium carbonate (usually aragonite and/or calcite)
fossil
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary
Tree Agate
Dendritic Chalcedony (SiO2)
sedimentary
Fossilized Coral (Petrified Coral)
Anthozoa (Scleractinia)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Rhyolite containing Fossilized Cyanobacteria (Stromatolite)
sedimentary
Fossilized Bivalve in Limestone
Class Bivalvia within Sedimentary Matrix (likely CaCO3)
fossil
Petoskey Stone
Hexagonaria percarinata
sedimentary
Cockle Shell (Bivalve)
Cardiidae (Calcium Carbonate, CaCO3)
fossil
Kambaba Jasper (Crocodile Jasper)
Stromatolite (Fossilized Algae within Microcrystalline Quartz), SiO2
sedimentary
Polished petrified wood
Silicified wood, chiefly microcrystalline quartz (SiO₂)
fossil
Murex Fossil
Muricidae (Calcium Carbonate fossilization)
fossil
Ammonite Fossil (Iridiscent)
Ammonoidea (subclass)
fossil
Amber
Succinite (Resinous fossilized tree sap)
Mineraloid
Fossilized shark teeth in sedimentary matrix
Elasmobranchii teeth, chiefly shark; calcium-phosphate apatite (hydroxyapatite)
fossil
Chert Cobble with Crinoid Fossil
Silica (SiO2) with Crinoid ossicle
sedimentary
Fossilized Rugose Coral (Petoskey Stone type)
Hexagonaria percarinata (Order: Rugosa)
sedimentary