Mineralized Fossil

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Biogenic Fossils

Fossiliferous Limestone (Crinoidal)

Calcite-bearing bioclastic packstone (CaCO3)

Fossiliferous limestone (reef or shell-rich limestone)

Bioclastic calcarenite/calcirudite; predominantly calcite (CaCO₃)

Tumbled, weathered limestone or calcareous concretion

Calcite-rich limestone; predominantly calcium carbonate (CaCO₃)

Fossil Shell

Brachiopod or Mollusk fossil

Fossilized Shark Tooth

Chondrichthyes (Class)

Fossil plant impression slab

Fossilized plant compression/impression; exact taxon indeterminate from the image

Crinoid Stem Fossil in Matrix

Crinoid (Class Crinoidea) in Limestone/Siltstone matrix

Brachiopod Fossil in Limestone

Phylum Brachiopoda embedded in sedimentary rock

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Weathered limestone fragments

Limestone, primarily calcite (CaCO₃)

Mosasaur Tooth Fossil

Mosasauridae (likely Prognathodon or Plioplatecarpus)

Quartz in Matrix (or Quartz Vein Rock)

Silicon Dioxide (SiO2) with host rock

Polished fossiliferous limestone

Fossiliferous micrite/bioclastic limestone, likely crinoidal or shell-rich limestone

Fossilized Dinosaur Skull (Tyrannosaurus rex)

Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica

Fossilized Bone

Permineralized Vertebrate Bone

Mosasaur Tooth

Mosasaurus beaugei (Fossilized Tooth)

Fossiliferous Sandstone / Quartzite Pebble

Sedimentary rock with skeletal fragments (e.g., Paleozoic crinoid/brachiopod fossils)

Fossil Coral

Anthozoa (Scleractinia)

Fossilized Fish (Lepidotes)

Lepidotes sp. (Order: Lepisosteiformes)

Weathered quartz-rich pebble (probable quartzite or quartz vein material)

Quartzite, predominantly SiO₂ (identification provisional)

Likely quartz-rich metamorphic rock (quartzite or micaceous schist)

Quartzite/schist; predominantly quartz (SiO₂) with mica and minor iron oxides

Breccia

Breccia (Clastic Sedimentary Rock)

Basalt

Basalt (Mafic volcanic rock)

Fossiliferous limestone

Calcarenite/bioclastic limestone, predominantly calcite (CaCO₃)

Pyrite

Iron Disulfide (FeS2)

Fossilized Shark Tooth (fragment)

Elasmobranchii (Class) fossil

Drusy quartz cluster (likely quartz on a pale host rock)

Quartz, silicon dioxide (SiO₂), likely microcrystalline/drusy quartz

Iron-stained quartz

Quartz (SiO₂), with limonite/goethite coatings

Sandstone Pebble with Iron Staining

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Pyrite

Iron sulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Pyrite (FeS2)

Mammoth or Mastodon Tooth Fragment

Mammuthus / Mammut molar fragment

Quartzite (with Quartz Veining)

Quartzite (SiO2)

Fossilized Shark Tooth

Elasmobranchii (Class) fossil

Sandstone Concretion

Sedimentary Concretion (Quartz sand bound by mineral cement)

Snowflake obsidian

Volcanic glass (obsidian), chiefly silica-rich rhyolitic composition, with cristobalite or feldspar spherulites

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz-rich breccia or iron-stained quartz

Microcrystalline to crystalline quartz (SiO₂), with probable iron-oxide staining and minor host-rock fragments

Fossilized Trilobite Pygidium / Glabella Fragment

Trilobita (e.g., Phacops or Ceraurus sp.)