Fossilized Gastropod Internal Mold
Gastropoda (Steinkern fossil)
fossil
Category
Sedimentary (Fossilized Organic Matter)
Browse sedimentary (fossilized organic matter) specimens identified by the Rock Identifier community.
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Fossilized oyster or other bivalve shell
Calcitic bioclast, commonly Ostrea spp. or Exogyra spp.
fossil
Honey calcite (likely cleavage fragment)
Calcite, CaCO₃
mineral
Fossilized Oyster Shell
Exogyra or Ostrea (Gryphaeidae/Ostreidae family)
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
Liesegang Banded Sandstone (Wonderstone)
Ferruginous Sandstone with Liesegang Rings
sedimentary
Mookaite Jasper
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Fossilized Shark Tooth
Selachii (Elasmobranchii subclass)
fossil
Fossil Sponge / Horn Coral / Crinoid Stem
Phylum Porifera or Cnidaria fossilized in calcium carbonate / silica
fossil
Fossilized Shell Fragment
Bivalvia or Gastropoda (Class) fragment
fossil
Anthracite Coal
Anthracite
sedimentary
Bivalve Fossil (Shell Fragment)
Class Bivalvia (Calcium Carbonate - CaCO3)
sedimentary
Amber with Inclusion
Succiniferous fossil resin (C10H16O)
mineraloid
Fossilized Sand Dollar
Echinoidea (Clypeasteroida)
fossil
Fossilized Coral (Favosites)
Favosites goldfussi
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
Petoskey Stone
Hexagonaria percarinata
fossil
Amber
Succinite (C10H16O)
Organic Mineraloid
Fossilized Brachiopod Shell
Order Spiriferida (likely)
fossil
Fossilized Mosasaur Tooth
Mosasauridae (likely Prognathodon or Mosasaurus)
fossil
Crinoid Stem Fossil
Crinoid columnal (Echinodermata)
fossil
Fossilized Gastropod Shell
Class Gastropoda (Fossil)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Fossilized Shark Tooth
Elasmobranchii tooth (commonly Otodus or Scapanorhynchus sp.)
fossil
Fossilized Shark Tooth
Otodus obliquus (Mackerel Shark)
sedimentary
Fossilized Coral (Favosites)
Favosites (Extinct Tabulate Coral)
sedimentary
Fossil Coral
Scleractinia (Stony Coral) fossil
fossil
Likely weathered quartz-rich stone or fossil fragment
Indeterminate; possibly quartz-bearing sandstone, iron-stained quartz, or a fragmentary fossil
mineral
Fossil Belemnite Guard
Belemnitida (Order), often Hibolites or Neohibolites spp.
fossil
Fossiliferous limestone
Calcarenite/bioclastic limestone, predominantly calcite (CaCO₃)
sedimentary
Fulgurite
Fulgurite (Lechatelierite-rich variety)
metamorphic
Rugose Coral Fossil
Rugosa (Order)
sedimentary
Fossil Rugose Coral (Horn Coral)
Order Rugosa (likely Grewingkia or Heliophyllum species); Calcium Carbonate (CaCO3)
sedimentary
Horn Coral Fossil
Rugosa (Order Rugosa)
sedimentary
Fossiliferous Limestone with Rugose Coral
Rugosa (order), typically preserved in CaCO3 (Calcite)
sedimentary
Fossilized Trilobite or Mollusk Fragment
Phylum Arthropoda / Mollusca fossil in sedimentary matrix
fossil
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Sandstone (Cross-bedded Drill Core)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary