Organic Specimen (Fossil)

Chert (Fossiliferous)

Silicon Dioxide (SiO2)

Fossiliferous Shale

Laminated Mudrock with plant fossils

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (v. Flint)

Sedimentary Cryptocrystalline Quartz (SiO2)

Chert Nodule (Fossiliferous Chert)

Microcrystalline Quartz (SiO2)

Fossiliferous Rock (likely Dinosaur Fossil in Matrix)

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

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)

Fossil Crab

Decapoda (likely Avitelmessus or Raninidae family)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with fossil inclusions

Petrified Wood

Silicified Wood / Chalcedony (SiO2)

Dinosaur Fossil (Skull)

Dinosauria fossilis (Petrified Hydroxyapatite / Calcium Carbonate)

Petrified Wood

Silicified Wood (primarily SiO2)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (containing small fossils)

Chert (Microcrystalline Quartz, SiO2)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (Field Pebble)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone (Crinoidal)

Calcium Carbonate (CaCO3) - Limestone containing bioclasts

Petrified Wood

Silicified Wood (SiO2)

Chert Pebble (Jasper/Quartz variety)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Fossilized Bivalve Shell

Bivalvia (fossil specimen)

Fossiliferous Limestone

CaCO3 (principally Calcite or Aragonite)

Petrified Wood

Silicified Wood (SiO2)

Shale or Slaty Mudstone

Argillaceous sedimentary rock

Shale or Siltstone

Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)

Petrified Wood

Silicon Dioxide (SiO2) permineralized organic matter

Chert (Iron-stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Fossilized Megalodon Tooth Fragment

Otodus megalodon (Carcharocles megalodon fossil)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Flower Jasper

Agatized Fossil Coral / Chalcedony (SiO2)

Chert Pebble (Jasper variety)

Microcrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood)

Silicified Paleoflora (mainly Quartz, SiO2)

Petrified Wood

Silicified Wood (SiO2 - Quartz/Chalcedony replacement)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO₂ / Silicon Dioxide)

Chert (Quartz Pebble)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Mosasaur Tooth Fossil

Mosasaurid vertebrate fossil (Hydroxyapatite)

Petrified Wood

Silicified Wood (SiO2)

Fossilized Shark Tooth (Fragment)

Elasmobranchii fossil (likely Cretalamna or Squalicorax genus)