Sedimentary (Fossil)

Coal (Bituminous / Anthracite)

Carbonaceous Sedimentary Rock (C)

Chert Nodule in Limestone

Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)

Fossilized bivalve shell fragment

Pectinid or related scallop bivalve; shell originally composed mainly of calcite (CaCO₃)

Weathered fossil-bearing limestone, possibly coral or shell limestone

Calcite-rich limestone (CaCO₃); fossil identity is uncertain from the photograph

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Fossiliferous Limestone / Petrifaction

Sedimentary rock with fossil inclusions / Calcium Carbonate (CaCO3)

Polished fossiliferous limestone, likely fossil shell fragment

Calcite-rich limestone (CaCO₃), possibly bioclastic/coquina limestone

Fossil brachiopod shell

Brachiopoda; exact genus/species indeterminate

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃), with fossil shell fragments

Petrified Wood

Silicified Wood (primarily SiO2)

Turtle Stone / Septarian Nodule (Fragment)

Septarian Concretion (Calcite, Aragonite, and Limestone)

Fossiliferous Limestone (with Coralline Inclusions)

Calcium Carbonate (CaCO3)

Mosasaur Jaw Fossil in Matrix

Mosasaurus (family Mosasauridae) in Phosphate Sandstone

Crinoid Stem Fossil

Class Crinoidea (Phylum Echinodermata), often preserved in Limestone or Calcite (CaCO3)

Stromatolite (Fossiliferous Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossilized Tabulate Coral (Honeycomb Coral)

Favosites (Order: Tabulata)

Crinoid Stem Fossil

Crinoid columnal (Class Crinoidea)

Fossiliferous Limestone (Coquina)

Calcite (CaCO3) with Bioclastic inclusions

Limestone with Fossil Fish Fragment

Calcite (CaCO3) containing a fossil teleost

Cut limestone masonry

Calcitic limestone, predominantly calcium carbonate (CaCO₃)

Limestone (Fossiliferous)

Sedimentary Carbonate Rock (CaCO3)

Petrified Coral Fossil

Rugose or Tabulate Coral (Hexagonaria or similar fossilized cnidarian)

Fossil Shark Tooth (Sand Tiger or Mackerel Shark)

Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate

Shark Tooth Fossil

Carcharocles megalodon or similar extinct shark tooth

Fossilized bone fragment (probable vertebrate bone)

Permineralized bone; exact taxon indeterminate from the image

Fossiliferous Limestone with Crinoid Stem

Bioclastic Limestone (CaCO3)

Sandstone

Arenite (SiO2 primarily)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

Fossiliferous Limestone Pebble

Biogenic Sedimentary Rock (CaCO3)

Fossil plant impression, likely fern or leaf

Indeterminate fossilized vascular-plant compression; possibly a fern frond or other Paleozoic plant

Fossilized Gastropod Shell

Gastropoda (Fossilized internal mold or shell body)

Stromatolite

Biogenic sedimentary structure (Stromatolite)

Limestone with Gastropod Fossil

Sedimentary Calcium Carbonate (CaCO3) with Gastropoda inclusion

Sandstone

Arenite (primarily Quartz, SiO2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Sandstone with Trace Fossils

Arenite / Quartzwacke with Ichnofossils

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Ammonite fossil

Ammonoidea; likely a Jurassic or Cretaceous ammonite

Sandstone (Pebble)

Clastic sedimentary rock (SiO2 primary)

Marine invertebrate fossils (Brachiopods and Gastropods)

Phylum Brachiopoda and Class Gastropoda

Weathered fossiliferous limestone, likely coral or shell fragment

Calcite (CaCO₃), biogenic limestone; exact fossil taxon indeterminate from the image