Mineralized Fossil

Petrified Wood

Silicon Dioxide (SiO2) - Calcified / Silicified Wood

Orthoceras Fossil Limestone

Orthoceras sp. (Calcium Carbonate, CaCO3)

Sandstone

Arenite (Clastic Sedimentary Rock)

Dendritic sandstone

Sandstone with Manganese Oxide dendrites

Sandstone

Arenite (primarily SiO2)

Mosasaur Tooth

Mosasaurus sp.

Chalcedony (Common Opal variant)

Silicon dioxide (SiO2) with varying levels of hydration

Sandstone (Iron-stained)

Clastic sedimentary rock (SiO2 with Fe2O3 staining)

Petrified Wood

Silicified Wood (SiO2)

Fossiliferous Limestone (with Crinoids/Coral)

Fossiliferous Limestone (CaCO3)

Fossilized Oyster Shell

Gryphaea or Exogyra (Family Ostreidae)

Fossil Shark Tooth

Selachimorpha (Chondrichthyes dental fossil)

Ironstone Concretion (Limonite/Goethite)

Goethite/Limonite concretion (FeO(OH)·nH2O)

Chert Concretion

Microcrystalline Quartz (SiO2) in Carbonate Matrix

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2 with mineral cement)

Siderite Concretion

Ironstone (Siderite) Concretion, FeCO3

Petrified Wood

Silicified Wood (primarily SiO2)

Sandstone with Ironstone Concretion

Arenite with Ferruginous Cement

Fossilized coral or carbonate fossil fragment

Calcareous fossil, likely colonial coral (order Hexacorallia; uncertain from image)

Sandstone Geode

Sedimentary Geode (Silica/Calcite composition)

Turritella Gastropod Fossil

Turritella (mollusk fossil in sedimentary matrix)

Trace Fossil (Lichenandites or Rhynie Chert Chert with Microfossils)

Trace fossil in microcrystalline quartz (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (typically SiO2 + others)

Ironstone (Limonite/Hematite)

Ferruginous sedimentary rock (Fe2O3·nH2O / Fe2O3)

Sandstone Concretion

Limonitic Sandstone Concretion

Dendritic Siltstone (or Mudstone)

Siltstone with Manganese Oxide dendrites

Siltstone with iron staining

Siltstone (primarily SiO2 with FeO(OH) coatings)

Chert (Jasper / Flint Variant)

Microcrystalline Quartz (SiO2)

Sandstone with Iron Oxide Staining

Arenite with Limonite/Hematite alteration

Sandstone

Arenite (lithic or quartz sandstone)

Fossiliferous Limestone with Quartz Veining

Limestone (Calcium Carbonate, CaCO3)

Fossiliferous Limestone

Biogenic Sedimentary Rock (primarily CaCO3)

Fossiliferous Limestone

CaCO3 (with biological inclusions)

Limestone

CaCO3 (principally Calcite)

Petrified Wood Fragment

Silicified Wood (SiO2)

Fossilized Shark Tooth

Elasmobranchii tooth (commonly Otodus or Scapanorhynchus sp.)

Dendritic Agate (Blue Chalcedony)

Silicon Dioxide (SiO2)

Sandstone and Gravel Aggregate

Clastic Sedimentary Rock / Quartzose Sandstone

Sandstone

Clastic sedimentary rock (Quartz arenite)

Chert (Flint Pebbles)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Bivalve Fossil (Cockle shell)

Class Bivalvia (e.g., Anadara or Veneridae family)