Organic Specimen (Fossil)

Fossil Shark Tooth (Cretaceous white shark type)

Squalicorax (commonly known as Crow Shark)

Fossiliferous Limestone or Shale

Biomicrite (if limestone) or Fossiliferous Shale

Fossiliferous Limestone

Fossiliferous Limestone

Fossiliferous Limestone with Rugose Coral

Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Fossiliferous Sandstone Pebble (with Crinoid / Shell Impression)

Sandstone containing fossiliferous inclusions (SiO2 matrix with calcite/silica cast fossil)

Fossiliferous Limestone

Bioclastic Limestone

Fossiliferous Sedimentary Rock

Sedimentary Rock with Invertebrate Fossil Imprint

Possible fossilized bone fragment

Fossil bone, composition primarily carbonate-hydroxylapatite [Ca₅(PO₄)₃(OH)]

Fossiliferous Limestone

Bioclastic Limestone (Calcium Carbonate, CaCO3)

Polished fossil bone fragment

Fossilized bone, likely mammalian or reptilian; exact taxon cannot be determined from the image

Limestone Pebble with Crinoid Fossil

Calcium Carbonate (CaCO3) - Fossiliferous Limestone

Silicified Gastropod Fossil (Agatized Fossil)

Gastropoda (Class) preserved in Chalcedony/Quartz (SiO2)

Fossiliferous shale or mudstone with plant fossils

Carbonaceous mudstone/shale containing fossilized foliage, likely fern or seed-fern impressions

Petrified Wood

Silicified Wood (SiO2)

Fossiliferous Limestone

Biogenic Limestone with Brachiopod/Crinoid fragments

Chert (and Fossilized Brachiopod shell)

Sedimentary Cryptocrystalline Quartz (SiO2)

Chert with Crinoid Fossil Impression

Microcrystalline Quartz (SiO2) with Crinoidea fossil impression

Fossilized wood or bone fragment

Indeterminate permineralized organic fossil; possibly silicified wood or fossil bone

Polished fossiliferous limestone

Bioclastic limestone, commonly crinoidal or shell-rich micrite

Fossilized Shell in Limestone

Carbonate sedimentary rock with Bivalvia or Brachiopoda remains

Petrified Wood

Silicified Wood (SiO2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with marine fossils

Fossiliferous Limestone

Biogenic Sedimentary Rock (CaCO3)

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Fossiliferous Kalkstein (Marl/Sandstone)

Fossiliferous calcarenite/siltstone

Bivalve Fossil (Internal Mold/Steinkern)

Class Bivalvia (Fossilized Mold)

Amber

Succinite (fossilized tree resin), C10H16O

Fossilized bone, likely a large vertebrate limb or rib fragment

Petrified bone; exact taxon indeterminate from the image

Fossiliferous Limestone

Bioclastic Limestone (CaCO3)

Fossilized Bone

Permineralized Bone (Vertebrate Fossil)

Chert (with potential fossil inclusion)

Microcrystalline Quartz (SiO2)

Limestone with Fossil Fragments

Bioclastic Carbonate Rock (CaCO3)

Fossil plant impression slab

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

Polished amber-like chalcedony/jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony or jasper; amber cannot be confirmed visually

Fossilized Shark Tooth

Carcharocles sp. (likely Lemon or Sand Tiger)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (containing Fossil Mold)

Silicon dioxide (SiO2)

Fossiliferous Limestone with Rugose Coral

Lithostrotionella (Limestone Matrix - CaCO3)

Sandstone with Brachiopod Mold Fossil

Sedimentary rock (Sandstone) with indeterminate Brachiopod mold

Petrified Wood

Silicified Wood (SiO2)

Petrified wood

Silicified wood, commonly quartz (SiO₂) replacing woody tissue