Ironstone Concretion
Ironstone (Limonite/Goethite/Hematite mixture)
sedimentary
Category
Sedimentary (Fossil)
Browse sedimentary (fossil) specimens identified by the Rock Identifier community.
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Ammonite Fossil (Polished Half / Cleoniceras)
Ammonoidea (Subclass), often Cleoniceras genus; fossilized with Calcite (CaCO3) and Aragonite
Sedimentary
Echinoid Fossil (Sea Urchin Fossil)
Echinoidea (phylum Echinodermata), often preserved as Calcite (CaCO3)
sedimentary
Orthoceras Fossil Limestone
Orthoceras sp. (Calcium Carbonate, CaCO3)
sedimentary
Weathered limestone or dolostone
Micritic limestone, primarily calcite (CaCO₃), possibly dolomite (CaMg(CO₃)₂)
sedimentary
Fossiliferous limestone fragment
Calcitic limestone; mainly calcium carbonate (CaCO₃), possibly with shell or coral debris
sedimentary
Possible weathered sandstone or iron-rich sedimentary rock
Indeterminate siliciclastic rock; likely quartz-rich sandstone with iron-oxide cement
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Fossil Brachiopod Cast (Atrypa species)
Phylum Brachiopoda, Class Rhynchonellata, Order Atrypida
sedimentary
Fossil Coral
Coral Limestone (a type of biogenic sedimentary rock)
Sedimentary
Belemnite Fossil
Belemnitida (Order of extinct cephalopods)
sedimentary
Belemnite Fossil
Belemnitida (extinct order of Cephalopods)
sedimentary
Fossil Coral
Scleractinia (Anthos), primarily Calcium Carbonate (CaCO3)
sedimentary
Ammonite Fossil
Ammonoidea (typically preserved as Calcite CaCO3 or Pyrite FeS2)
sedimentary
Goniatite Fossil
Goniatitida (Order), fossilized in limestone/calcite (CaCO3)
sedimentary
Fossil Coral
Fossilized Scleractinia or Tabulata (various genera/species)
Sedimentary
Flint with Fossil
Silicon dioxide (SiO2) microcrystalline quartz with fossiliferous inclusions
sedimentary
Fossil Coral
Cnidaria fossil (often Calcium Carbonate / CaCO3)
sedimentary
Ammonite Fossil
Ammonoidea (primarily composed of Calcite, CaCO3, or Pyrite)
sedimentary
Calamites (Fossil)
Calamites sp. (Tracheophyta, Equisetopsida)
sedimentary
Bryozoan Fossil
Phylum Bryozoa (commonly known as 'moss animals')
sedimentary
Fossil Coral
Scleractinia or Anthozoa (Fossilized)
fossil
Sandstone with Dendritic Inclusions
Quartzose Sandstone
sedimentary
Ammonite Fossil
Ammonoidea
fossil
Fossil Coral
Rugosa or Tabulata coral fossil (Calcium Carbonate, CaCO3)
fossil
Belemnoit Fossil (Sea Squid Fossil)
Belemnitida (Order within Cephalopoda)
sedimentary
Sandstone (Quartz-rich)
Arenite (composed primarily of SiO2)
sedimentary
Fossil bivalve or brachiopod in sedimentary rock
Unidentified fossil shell impression; likely a ribbed bivalve or brachiopod preserved in shale/siltstone
fossil
Sandstone
Arenite (SiO2 based)
sedimentary
Fossilized Shark Tooth (Sand Tiger)
Carcharias sp. (Fossilized Tooth)
fossil
Sandstone and Mixed Rock Assemblage
Clastic Sedimentary Rock / Quartz Arenite
sedimentary
Sandstone and Gravel Aggregate
Clastic Sedimentary Rock / Quartzose Sandstone
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossil Coral
Hexagonaria / Rugosa / Scleractinia
fossil
Triceratops Fossil
Triceratops horridus
fossil
Ammonite Fossil
Ammonoidea
fossil
Sandstone/Quartzite
Sedimentary Rock (composed mainly of SiO2)
sedimentary
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Fossilized Horse Tooth
Equus ferus caballus (fossilized molar/premolar)
fossil