Sedimentary (Fossil)

Echinoid Fossil (Sea Urchin Fossil)

Echinoidea (phylum Echinodermata), often preserved as Calcite (CaCO3)

Limestone (with Iron-Oxide staining)

Sedimentary Calcium Carbonate (CaCO3)

Gastropod Fossil (Internal Mold)

Phylum Mollusca, Class Gastropoda (Steinkern)

Orthoceras Fossil in Limestone

Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone

Fossil Coral

Cnidaria Anthozoa (Fossilized)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)

Sandstone (Red Arkose)

Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)

Sandstone

Arenite (primarily SiO2)

Limestone

Calcium carbonate (CaCO3)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Calcareous or Ferruginous)

Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)

Sandstone

Arenite (Siliclastic sedimentary rock, primarily SiO2)

Sandstone

Arenite (Sedimentary rock comprising sand-sized grains)

Petrified Wood

Silicified Wood (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Brachiopod Fossil in Shale

Phylum Brachiopoda (often species of Order Spiriferida or Rhynchonellida)

Fossil Shark Tooth (Sand Tiger or Mackerel Shark)

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

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Petrified Wood

Silicified Wood (SiO2)

Hag Stone

Perforated Sedimentary Rock

Coal

Bituminous or Anthracite coal (carbon-rich sedimentary rock)

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Dinosaur Bone (Gembone)

Petrified Dinosaur Bone (Apatite/Silica replacement)

Petrified Wood

Silicon Dioxide (SiO2) - Calcified / Silicified Wood

Fossilized Coral (Petoskey Stone / Favosites)

Favosites (extinct genus of tabulate coral)

Gastropod Fossil (Snail Internal Mold)

Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)

Horn Coral Fossil

Rugosa (Order Rugosa)

Fossil Coral

Cnidaria fossil (often Calcium Carbonate / CaCO3)

Fossilized Crinoid Stem Segment

Crinoid (Phylum Echinodermata, Class Crinoidea)

Granular Sandstone

Arenite (variable composition, primarily SiO2)

Chert (Fossiliferous)

Silicon dioxide (SiO2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Fossiliferous Limestone

Bioclastic Limestone (composition: CaCO3)

Petoskey Stone

Hexagonaria percarinata (Fossilized colonial coral)

Fossiliferous Rock (likely Dinosaur Fossil in Matrix)

Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)

Jasper (likely Kambaba or Crocodile Jasper variety)

Silicon Dioxide (SiO2) with inclusions

Ironstone Concretion (Nutstone)

Ironstone (with High Limonite/Hematite Content)

Sandstone

Arenite (primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Sandstone

Arenite (composed primarily of SiO2)