Mineralized Fossil

Crinoid Stem Fossil in Matrix

Crinoid (Class Crinoidea) in Limestone/Siltstone matrix

Quartz Vein in Host Rock (Gossanous Matrtix)

Silicon Dioxide (SiO2) with iron oxides (Limonite/Hematite)

Fossilized Brachiopod

Phylum Brachiopoda (replaced by Calcite/CaCO3)

Fossilized Crab Carapace (Concretion)

Decapoda (fossil), typically preserved in calcite or siderite concretion

Fossilized Brachiopod

Phylum Brachiopoda (Calcium Carbonate/Silica replacement)

Fossilized Shark Tooth

Carcharocles sp. (likely Lemon or Sand Tiger)

Mosasaur Tooth Fossil

Mosasaurid vertebrate fossil (Hydroxyapatite)

Orthoceras Fossil in Limestone

Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone

Brachiopod Fossil

Rhynchonellida (Order)

Ferruginous Sandstone Concretion (Ironstone Phosphorite)

Ferruginous Sandstone (variable Fe-oxide/hydroxide composition)

Fossilized Bivalve Shell

Bivalvia (fossil specimen)

Fossilized Gastropod in Limestone

Gastropoda (Class) in Calcium Carbonate (CaCO3)

Lepidodendron Fossil in Sandstone

Lepidodendron (Lycophytina, Lepidodendrales)

Pyritized Ammonite

Ammonitida (replaced by Iron Disulfide, FeS2)

Echinoid Fossil (Commonly called a Sea Urchin or Heart Urchin)

Phylum Echinodermata, Class Echinoidea

Coprolite

Fossilized Feces

Chert (Flint Pebbles)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Pyrite

Iron Sulfide (FeS2)

Silicified Gastropod Fossil (Agatized Fossil)

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

Granite Cobble

Phaneritic Plutonic Felsic Rock

Gastropod Fossil (Snail Internal Cast)

Class Gastropoda (Steinkern)

Sandstone Pebble with Iron Staining

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)

Siderite Concretion (Nodule)

Iron Carbonate (FeCO3) Concretion

Concretion in Shale

Siltstone/Shale with Siderite or Calcareous concretions

Fossilized Dinosaur Skull (Tyrannosaurus rex)

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

Rugose Coral Fossil (Horn Coral)

Order Rugosa (common genera include Zaphrentis or Heliophyllum)

Ironstone Concretion

Siderite or Hematite Concretion (FeCO3 or Fe2O3)

Fossilized Shark Tooth

Fossil Chondrichthyes (various genera such as Carcharias or Odontaspis)

Fossil Plant Impression (Calamites)

Calamites sp. (Tracheophyta: Equisetopsida)

Gastropod Internal Mold (Steinkern)

Class Gastropoda fossil mold (Phylum Mollusca)

Petrified Wood

Silicified wood (Quartz, SiO2)

Ironstone Nodules / Siderite Concretion

Siderite (FeCO3) / Ferruginous Septarian Concretion

Petrified Wood

Silicified Wood (SiO2)

Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)

Gneiss (complex silicate composition)

Tumbled Stone Collection (Fluorite, Sodalite, Moss Agate, Amethyst/Charoite, and Grey Agate)

Silica (SiO2) and Calcium Fluoride (CaF2) based minerals

Fossilized Gastropod Shell

Class Gastropoda (Fossil)

Fossilized Bone Chunk (likely Dinosaur or Large Mammal)

Permineralized Fossil Bone

Petrified Coral (Agatized Coral)

Anthozoa (Agatized Fossil)

Ironstone Concretion

Ironstone (primarily Siderite or Limonite / Goethite, FeO(OH)·nH2O)

Bivalve Fossil (Clam/Mollusk)

Class: Bivalvia (Order: Veneroida), Calcium Carbonate (CaCO3)

Fossilized Rugose Coral

Order Rugosa (Calcium Carbonate - CaCO3)

Fossilized Bone Fragment

Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)