Stromatolite (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Category
Fossil
Browse fossil specimens identified by the Rock Identifier community.
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossil Shark Tooth (Cretaceous white shark type)
Squalicorax (commonly known as Crow Shark)
Organic specimen (fossil)
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossilized Coral
Anthozoa (Fossilized)
Sedimentary / Fossil
Echinoid Fossil (Commonly called a Sea Urchin or Heart Urchin)
Phylum Echinodermata, Class Echinoidea
sedimentary
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone
sedimentary
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Sandstone (likely Red/Brown Sandstone)
Arenite (SiO2 based)
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Chert (with possible fossils)
Microcrystalline quartz (SiO2)
sedimentary
Fossiliferous Chert (Chert with Crinoid Stem Impression)
Chert (SiO2) with fossil Anthozoan or Crinoid columnals
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Red/Brown Variety)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Sandstone (Ferruginous)
Arenite (with iron oxide cement, Fe2O3)
sedimentary
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class), often found as calcitic fossils
sedimentary
Rugose Coral (Horn Coral)
Order Rugosa (extinct fossilized coral)
sedimentary
Fossilized Shark Tooth in Matrix
Otodus sp. (likely Otodus obliquus)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Crinoid Columnal Fossil
Class Crinoidea (Echinodermata); usually calcite replacement (CaCO3)
sedimentary
Fossilized Rugose Coral (Petoskey Stone precursor)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Jasper (likely Kambaba or Crocodile Jasper variety)
Silicon Dioxide (SiO2) with inclusions
sedimentary
Fossil Coral
Scleractinia (fossilized calcium carbonate)
sedimentary
Ammonite Fossil
Ammonoidea (primarily composed of Calcite, CaCO3)
sedimentary
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Ammonite Fossil
Ammonoidea (Calcium carbonate or Pyrite replaced)
sedimentary
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Trilobite Fossil
Trilobita (Class), likely Phacopid or Asaphid order
sedimentary
Fossil Shell in Sedimentary Matrix
Bivalvia (fossil) in Calcium Carbonate Matrix
sedimentary
Brachiopod Fossil in Shale
Phylum Brachiopoda (often species of Order Spiriferida or Rhynchonellida)
sedimentary
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Trilobite Pygidium (Tail Segment)
Phylum Arthropoda, Class Trilobita (likely order Phacopida)
sedimentary (fossil)
Petrified Wood (Silicified Wood)
Silicified fossil wood (SiO2)
metamorphic
Amber with Inclusion
Succiniferous fossil resin (C10H16O)
mineraloid
Fossilized Turritella Gastropod (Internal Mold)
Turritella (Fossil Gastropod Crust)
sedimentary