Fossil

Petoskey Stone

Hexagonaria percarinata

Shale

Shale (clastic sedimentary rock composed of silt and clay-sized particles)

Megalodon Shark Tooth Fossil

Otodus megalodon (fossilized in sedimentary matrix)

Petrified Wood

Silicified Wood (primarily SiO2)

Gastropod Steinkern (Fossilized Snail Cast)

Phylum Mollusca, Class Gastropoda (Commonly CaCO3 or SiO2 after replacement)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sand Dollar Fossil (Echinoidea)

Class Echinoidea (likely order Clypeasteroida), CaCO3 (Calcite)

Fossilized cylindrical shell or bone fragment

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

Glauconitic Sandstone

Glauconitic Sandstane (containing K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Fossilized bivalve shell

Indeterminate fossil mollusk; likely a brachiopod or bivalve, originally calcite/aragonite (CaCO₃)

Coprolite

Fossilized Feces

Coral limestone / fossil coral

Calcitic fossil coral, commonly Scleractinia; CaCO₃

Fossiliferous Sandstone / Fossil Fragment

Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material

Kambaba Jasper (Crocodile Jasper)

Stromatolite Fossil (Silicified Stromatolite / Quartz with Microfossils)

Rounded quartz-rich pebble

Probable arkosic sandstone or weathered quartzite; exact identification is uncertain from the image

Limestone with Fossil inclusions

Fossiliferous Limestone (CaCO3)

Fossilized bivalve or ammonite fragment

Calcareous fossil; likely a mollusk shell preserved as calcite (taxonomic identification uncertain)

Fossil coral (likely honeycomb or tabulate coral)

Fossilized colonial coral; possibly Favositidae (Favosites) or related tabulate coral

Fossilized bivalve shell in limestone

Calcitic fossil shell; likely an oyster or other rudist/bivalve (Bivalvia), preserved in carbonate rock

Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Coquina or Fossiliferous Limestone

Biogenic Limestone (Calcite/Aragonite CaCO3)

Bivalve Fossil in Sedimentary Matrix

Fossiliferous Mudstone (Class: Bivalvia)

Fossiliferous Limestone with Brachiopod

Limestone (Calcium Carbonate, CaCO3) with Phylum Brachiopoda fossil

Coquina / Fossiliferous Limestone

Calcareous bioclastic sedimentary rock (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Fossilized coral or stromatoporoid

Calcitic fossil carbonate, possibly tabulate coral (order Favositida) or stromatoporoid

Fossilized Oyster Shell

Gryphaea or Exogyra (Family Ostreidae)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Petrified Wood

Silicified wood (Quartz replacement of organic wood structure)

Petrified Wood

Silicified Wood (SiO2)

Amber

Fossilized tree resin

Fossilized Crinoid Stem

Crinoidea (Echinodermata)

Fossilized Bryozoan

Bryozoa

Stromatolite

Biogenic sedimentary rock

Petrified Wood

Silicified wood (Quartz / Chalcedony replacement of organic cellulose)

Petrified Wood / Fossilized Wood

Silicified Wood (Silicon Dioxide - SiO2)

Petrified Wood

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Petrified Wood

Silicified wood / Xylopal

Petrified Wood

Silicified wood (permineralized wood)

Petrified Wood and Mixed Rocks

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (mainly Quartz / SiO2)

Fossilized Shark Tooth (Megalodon or Carcharocles fragment)

Elasmobranchii (Fossilized tooth root / crown section)