Fossil

Petrified Wood

Silicified Wood (SiO2)

Petrified wood

Silicified wood, commonly quartz (SiO₂) replacing woody tissue

Weathered fossil-bearing limestone, possibly coral or shell limestone

Calcite-rich limestone (CaCO₃); fossil identity is uncertain from the photograph

Fossiliferous limestone

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

Sandstone with Trace Fossils

Arenite with Ichnofossils

Polished fossil gastropod shell

Fossilized gastropod (snail) shell; exact taxon cannot be determined from the image

Polished fossil shell fragment

Likely fossilized bivalve shell; mineralized aragonite/calcite (exact taxon indeterminate)

Fossiliferous Limestone (Gastropod / Crinoid Fossil Rock)

Biogenic Sedimentary Rock (CaCO3)

Horn Coral Fossil

Rugosa (Order Rugosa)

Polished petrified wood

Silicified wood; commonly quartz/chalcedony (SiO₂) replacing wood tissue

Petrified Wood

Silicified Wood (SiO2 permineralization)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Petrified wood

Silicified wood; commonly quartz (SiO₂) replacing wood tissue

Possible fossilized shell or coral fragment

Indeterminate biogenic carbonate, likely calcite (CaCO₃)

Fossilized bivalve shell fragment

Calcitic shell material, commonly Arca or related marine bivalve; primarily CaCO₃

Tumbled amber-like gemstone

Likely amber (fossilized resin; organic mineraloid), possibly citrine or yellow-brown glass imitation

Favosite Fossil (Calyx or Rugose Coral)

Favosites (Extinct Tabulate Coral)

Likely petrified wood or silicified fossil fragment

Silicified wood; predominantly microcrystalline quartz (SiO₂)

Coal

Coal (Combustible sedimentary rock)

Sandstone with Quartz Vein

Quartz-cemented quartz arenite

Petrified Wood

Silicified Wood (SiO2)

Coal (Bituminous / Anthracite)

Carbonaceous Sedimentary Rock (C)

Fossilized Horn Coral

Rugosa (Rugose Coral)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Dinosaur Bone (Gembone)

Petrified Dinosaur Bone (Apatite/Silica replacement)

Gastropod Fossil (Snail Internal Mold)

Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)

Fossilized Coral (Petoskey Stone / Favosites)

Favosites (extinct genus of tabulate coral)

Petrified Wood

Silicon Dioxide (SiO2) - Calcified / Silicified Wood

Favosites Fossil (Honeycomb Coral)

Favosites (Extinct genus of Tabulate Coral)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)

Polished fossil shell or crinoid fragment

Likely calcitic fossil, possibly a bivalve shell; exact identification requires clearer detail

Sandstone

Clastic sedimentary rock (primarily Quartz)

Tumbled fossiliferous limestone

Fossiliferous micritic limestone, mainly calcite (CaCO₃)

Siderite Concretion (Nodule)

Iron Carbonate (FeCO3) Concretion

Concretion in Shale

Siltstone/Shale with Siderite or Calcareous concretions

Turritella Agate

Silicified Elimia tenera Fossil (SiO2)

Shark Tooth Fossil

Carcharhiniformes or Lamniformes (order level fossil)

Likely calcite-rich limestone or marble fragment

Calcite (CaCO₃), probably micritic limestone; exact identification requires testing

Fossilized Crinoid Stem Segment

Crinoid (Phylum Echinodermata, Class Crinoidea)