Sedimentary (Fossilized Organic Matter)

Petrified Wood

Silicified Wood (primarily SiO₂ / Silicon Dioxide)

Amber

Succinite (Fossilized Tree Resin)

Fossilized bone, likely a large vertebrate limb or rib fragment

Petrified bone; exact taxon indeterminate from the image

Amber

Succinite (fossilized resin)

Pink shell fragment

Calcium carbonate, likely aragonite or calcite (CaCO₃); probably a bivalve or gastropod shell fragment

Fossilized Insect in Nodular Matrix

Invertebrata / Insecta fossil in sedimentary concretion

Jasper (likely Brown or Brecciated)

Jasper (Silicon Dioxide, SiO2)

Amber

Amber (Fossilized Tree Resin)

Limonite (Iron Ore)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

Fossil Shark Tooth

Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite

Amber

Succinate (Fossilized Tree Resin)

Mosasaur Tooth Fossil

Mosasaurid vertebrate fossil (Hydroxyapatite)

Petrified Wood

Silicified Wood (primarily SiO2)

Fossilized Shark Tooth (Fragment)

Elasmobranchii (fossilized tooth)

Seashell Fossil

Invertebrate fossil (phylum Mollusca)

Likely amber or yellow-brown chalcedony/jasper fragment

Uncertain; possible amber (fossilized resin) or iron-stained chalcedony/quartz

Fossilized wood or plant fragment

Petrified wood (silicified fossil wood; commonly Araucarioxylon or related taxa)

Septarian Nodule

Septarian Concretion (Calcite, Aragonite, and Limestone)

Fossilized Shark Tooth (Eroded)

Carcharodon sp. or Otodus sp. fragment (likely)

Fossil shell fragment, likely bivalve or gastropod

Fossilized calcium-carbonate shell; likely aragonite/calcite replaced by calcite

Fossilized Shark Tooth (Otodus)

Otodus sp. (calcium phosphate/hydroxylellite)

Amber

Succinite

Fossilized coral or bryozoan limestone

Calcitic fossiliferous limestone; likely colonial coral/bryozoan fragments, CaCO₃

Amber

Succinite (fossilized tree resin), C10H16O

Moss Agate

Chalcedony (Silicon Dioxide / SiO2)

Moss Agate

Silicon Dioxide with inclusions (SiO2)

Jasper (Petrified Wood variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Fossilized bone fragment (probable mammalian tooth or bone)

Mineralized bone, commonly hydroxyapatite [Ca5(PO4)3(OH)] replaced or impregnated by silica/calcite

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Knightia Fossil in Limestone

Knightia eocaena in micritic limestone

Moss Agate

Chalcedony (SiO2) with inclusions of hornblende or chlorite

Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions

Moss Agate

Chalcedony (Silicon Dioxide) with inclusions - SiO2

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide

Likely coal (possibly anthracite)

Coal, composed chiefly of carbon-rich organic matter; rank cannot be confirmed from the photograph

Possible fossilized bone or tooth fragment

Indeterminate fossilized vertebrate material; mineralized hydroxyapatite replaced or coated by silica/carbonate

Amber

Fossilized Tree Resin (Organic Polymer)

Shark Tooth Fossil

Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)

Fossilized Gastropod (Snail)

Class Gastropoda (internal mold or 'steinkern')

Amber

Succinates

Amber

Succiniferous fossil resin (C10H16O)

Petrified Wood

Silicified Wood (SiO2-dominant)