Fossil

Sandstone

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with iron oxide cement)

Sandstone (likely Fossiliferous)

Arenite / Fossiliferous Sandstone (SiO2 composition)

Sandstone

Arenite (SiO2 primarily)

Chert Pebble

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Quartz-rich)

Sandstone (SiO2 dominated)

Sandstone

Arenite (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Limestone with Algal/Lichen Colonization

Calcium Carbonate (CaCO3)

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Sandstone (likely Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite/Quartz Arenite

Fossiliferous Limestone

Limestone (CaCO3 - Calcium Carbonate)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclastic inclusions

Stromatolite

Stromatolite (Cyanobacteria-formed Organo-sedimentary structure)

Fossilized Gastropod (Snail)

Class Gastropoda (internal mold or 'steinkern')

Kambaba Jasper

Stromatolite Jasper (Microcrystalline Quartz with Cyanobacteria fossile)

Megalodon Shark Tooth Fossil

Otodus megalodon

Fossiliferous Chert (with Brachiopod or Mollusk fragments)

Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions

Fossilized Shark Tooth (Otodus obliquus)

Otodus obliquus (Mineral composition: Bio-apatite/Calcium Phosphate replaced by various minerals)

Fossiliferous Limestone with Brachiopod shell

Calcium carbonate (CaCO3)

Turritella Agate (Calligrapher Stone)

Silicified Elimia tenera (Chalcedony/Quartz)

Hag Stone

Perforated Sedimentary Rock

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sandstone

Arenite (SiO2 primarily)

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Sandstone (likely Quartzose)

Arenite (SiO2 principal mineral)

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)

Jasper containing fossilized inclusions

Silicon Dioxide (SiO2) with trace impurities and biogenic inclusions

Orthoceras Fossil in Limestone

Orthoceras (extinct genus of cephalopods), mineralized as Calcite (CaCO3) in Fossiliferous Limestone

Conglomerate with Fossilized Shark Teeth

Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains

Orthoceras Fossil Limestone

Orthoceras (extinct Cephalopod fossil) in Matrix

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sandstone Pebble with Iron Staining

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)

Sandstone (Quartzose)

Arenite (Formula: SiO2 primary, with various cements)

Sandstone (Quartz Arenite)

Sandstone (Chemical formula: primarily SiO2)

Sandstone (Quartz Arenite)

Sandstone (SiO2 with possible mineral cements)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)