Organic Specimen (Fossil)

Fossilized Shark Tooth (Partial)

Elasmobranchii (fossil tooth fragment)

Shale or Siltstone

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

Petrified Wood with Lichen

Silicified Wood (SiO2) colonized by crustose lichens

Petrified Wood

Silicified Wood (SiO2)

Fossiliferous Limestone

Calcium carbonate matrix with macrofossils (CaCO3)

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Fossil Bivalve / Ostreid Shell (Hag Stone / Perforated Pebble)

Phylum Mollusca, Class Bivalvia

Fossilized Shark Tooth (Fragment)

Elasmobranchii fossil (likely Cretalamna or Squalicorax genus)

Chert (Iron-stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicon Dioxide (SiO2) permineralized organic matter

Fossiliferous shale or slate with plant impressions

Carbonaceous mudstone/shale; possible fossil plant material (often fern-like impressions)

Siltstone with plant fossil impression

Sedimentary rock with Archaeopteris or Calamites flora impression

Fossiliferous limestone

Bioclastic carbonate rock; predominantly calcite (CaCO₃), with fossil shell fragments

Sandstone with Fossil Leaf Impression

Sedimentary rock (Sandstone/Siltstone matrix) with Carbonaceous film fossil

Mammoth or Mastodon Tooth Fragment

Mammuthus / Mammut molar fragment

Petrified Wood

Silicified wood (Quartz replacement, SiO2)

Dinosaur Bone (Gembone)

Silicified Dinosaur Bone (SiO2 replacing organic tissue)

Petrified Wood

Silicified Wood (primarily SiO2)

Likely fossil oyster shell

Fossilized bivalve shell; exact species cannot be identified from the image

Fossilized wood fragment

Petrified wood; commonly silicified fossil wood (SiO₂ replacing organic tissue)

Weathered limestone or calcareous fossil fragment

Calcite-rich carbonate rock (CaCO₃), possibly fossiliferous limestone

Seashell (Cone Snail Shell)

Conus sp. (Calcium Carbonate, CaCO3)

Fossilized Bone Fragment

Vertebrate Fossil

Tumbled coral fragment (likely white calcitic coral)

Calcium carbonate, primarily aragonite or calcite (CaCO₃); exact coral genus cannot be determined from the image

Petrified Wood

Silicified Wood (primarily SiO2)

Bivalve seashell

Calcareous shell, primarily aragonite (CaCO₃); likely a modern cockle or related bivalve

Fossil gastropod shell

Fossilized marine gastropod; exact genus/species cannot be determined from the image

Petrified Wood

Silicified Wood (SiO2-dominant)

Chert (Jasper/Flint variety)

Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Petrified Wood (Silicified Wood)

Silicified Paleoflora (mainly Quartz, SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Fossilized ammonite fragment

Ammonoidea; likely an ammonite suture-section specimen, commonly Jurassic–Cretaceous

Petrified Wood

Silicified Wood (SiO2)

Jasper containing fossilized inclusions

Silicon Dioxide (SiO2) with trace impurities and biogenic inclusions

Petrified wood

Silicified fossil wood, commonly quartz/chalcedony (SiO₂) replacing woody tissue

Petrified Wood

Silicified Wood (primarily SiO2)

Fossil Shark Tooth (Sand Tiger or Mackerel Shark)

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

Petrified Wood

Silicified Wood (SiO2)

Chert Pebble (Jasper variety)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Fossilized Shell Fragment / Mother of Pearl

Calcium Carbonate (CaCO3) - Aragonite/Calcite biomineral