Fossil

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Limestone (Porous/Travertine variant)

Sedimentary Calcium Carbonate (CaCO3)

Sandstone with Bedding Planes

Arenite (Sedimentary rock composed primarily of sand-sized minerals)

Limestone

Calcium Carbonate (CaCO3)

Fossiliferous Limestone with Brachiopod Mold

Calcium Carbonate (CaCO3) matrix containing Brachiopoda fossil impressions

Fossiliferous Limestone (Bivalve Fossil)

Calcium Carbonate (CaCO3) with Bivalvia fossil

Fossilized Megalodon Tooth Fragment

Otodus megalodon (Carcharocles megalodon fossil)

Coquina

Coquina Limestone

Sandstone Concretion

Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)

Slate

Foliated Metamorphic Rock (primarily composed of Muscovite, Chlorite, and Quartz)

Fossilized Coral (Petoskey-style)

Hexagonaria percarinata (Fossilized Rugose Coral)

Fossiliferous Limestone (Crinoidal)

Calcium Carbonate (CaCO3) - Limestone containing bioclasts

Fossil Coral (Honeycomb Coral)

Favosites (extinct genus of Tabulate coral)

Fossiliferous Limestone (Coquina / Shell Bed)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sandstone

Arenite (primarily SiO2 with trace Fe2O3)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (White/Gray variety)

Chert (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Sandstone (Quartz-rich Pebble)

Arenite (primarily SiO2)

Chert (specifically a flint nodule component)

Microcrystalline quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Bituminous Coal

Organic sedimentary rock (humic coal)

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Echinoid Fossil (Sea Urchin)

Echinoidea (specifically likely Schizaster or similar genus), calcium carbonate (CaCO3)

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Shale

Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)

Fossil Coral (Favosites Honeycomb)

Favosites (Genus), Phylum Cnidaria, Class Anthozoa

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2 as Quartz/Chert/Chalcedony)

Sandstone (Quartzose Sandstone)

Arenite (SiO2)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Red Shale

Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)

Sandstone

Arenite (variable SiO2 composition)

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Arenicola (comprising mostly Quartz, SiO2)

Turritella (Gastropod Fossil)

Turritella (Genus of gastropods), CaCO3 (Calcium Carbonate or Silicified Agate)