Organic (Biological Specimen)

Crinozoan fossil (Crinoid stem fragment)

Crinoid (Class Crinoidea)

Sandstone (with biological crust)

Arenite (SiO2 based)

Possible fossil tooth or bone fragment

Indeterminate fossilized vertebrate material; species cannot be identified reliably from this image

Fossil tooth, likely mosasaur or large marine reptile tooth

Fossilized reptilian tooth; exact taxon requires diagnostic views and locality

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

Amber (Rough)

Succinite (Resinite)

Dendritic Agate or Manganese Nodule in Chert/Limestone

Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions

Ironstone Nodules (Iron Concretion)

Siderite or Hematite Concretion

Possible fossilized shell or fossil fragment

Indeterminate; possibly a small brachiopod or gastropod fossil in mineralized matrix

Chalcedony (Agate/Seashell replacement)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Amber

Succinite

Fossil Shark Tooth

Squalicorax (likely Squalicorax pristodontus or Squalicorax falcatus)

Fossilized shell or bone fragment

Likely bioclast composed mainly of calcium carbonate (calcite/aragonite); exact organism is indeterminate from the image

Fossil coral fragment

Likely calcitic colonial coral, possibly fossilized scleractinian coral

Amber

Succinite (Fossilized Tree Resin)

Fossilized mammoth molar fragment

Proboscidean molar enamel and dentine, commonly Mammuthus spp.

Limestone (Flagstone)

Fossiliferous Limestone (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Desert rose

Gypsum rosette (CaSO₄·2H₂O), sometimes barite (BaSO₄)

Bay Scallop Shell

Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)

Chert / River Cobble

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone

Carbonate sedimentary rock (CaCO3)

Fossilized tooth or tooth fragment

Indeterminate vertebrate tooth; likely mammalian, mineralized hydroxyapatite

Fossilized tooth, likely mammalian molar

Silicified or mineral-replaced mammalian tooth; exact taxon cannot be determined from the image

Polished fossil shell or bone fragment (tentative)

Indeterminate biogenic carbonate or fossilized bone; possibly a small gastropod/bivalve fragment

Fossil ammonite

Ammonoidea (likely a ribbed, involute ammonite; exact genus requires locality and preservation details)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Amber

Succinite (Fossilized Tree Resin) - C10H16O

Likely fossiliferous limestone fragment

Calcareous fossil assemblage, chiefly calcium carbonate (CaCO₃), possibly crinoid, bivalve, or bryozoan material in limestone

Fossilized cylindrical shell or bone fragment

Indeterminate biogenic carbonate or phosphatic fossil; possible fragment of a tubular shell (e.g., scaphopod) or hollow bone

Limestone with Fossil Inclusion

Calcium Carbonate (CaCO3) - Bioclastic Limestone

Fossilized shell or small fossil fragment

Indeterminate fossil; possibly a partial gastropod or bivalve, mineralized with calcite

Conglomerate with Fossilized Shark Teeth

Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)

Tumbled fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃), with fossil shell fragments

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Amber

Succinite (fossilized resin)

Pearl necklace

Pearl (biogenic calcium carbonate, chiefly aragonite; CaCO₃)

Amber / Copal

Fossilized Tree Resin (Succinate)

Yellow Calcite

Calcium Carbonate (CaCO3)

Silicified Snail Fossil

Gastropod (likely replaced by Chalcedony/Quartz - SiO2)

Tumbled tan stone, likely calcite or limestone

Calcite (CaCO₃), possibly microcrystalline limestone