Sedimentary (Fossilized)

Seashell Fossil

Invertebrate fossil (phylum Mollusca)

Augite Shell / Turret Snail Fossil (or Recent Seashell)

Gastropoda (Class) / Turritellidae (Family)

Bivalve Fossil (Fossilized Shell)

Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)

Asphalt (Bituminous Slate/Sandstone)

Asphaltum / Bituminous Rock

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Amber

Succinite (amorphous organic polymer)

Likely tumbled amber or orange chalcedony

Uncertain from image; possibly amber (fossilized resin, chiefly C10H16O) or carnelian (microcrystalline quartz, SiO₂)

Amber

Succinite

Fossilized Oyster Shell (Limestone/Coquina)

Crassostrea (Fossilized Bivalve), Calcium Carbonate (CaCO3)

Polished fossilized wood

Silicified wood (petrified wood), commonly quartz/chalcedony replacing wood

Botiroidal Chalcedony or Silicified Fossil Coral

Silicon Dioxide (SiO2) - Chalcedony / Scleractinia (if fossilized)

Amber with Organic Inclusions

Succinite (fossilized resin)

Dendritic Agate (River Pebble)

Silicon Dioxide (SiO2) with Manganese or Iron oxide inclusions

Fossiliferous Chert (with Brachiopod or Mollusk fragments)

Silicon dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions

Fossil bone fragment

Fossilized vertebrate bone, likely mammalian; exact taxon cannot be determined from the image

Fossilized Shark Tooth (Fragment) in Matrix

Elasmobranchii (subclass)

Fossilized Turritella Gastropod (Internal Mold)

Turritella (Fossil Gastropod Crust)

Fossiliferous limestone

Calcite-rich limestone (CaCO₃), possibly coral or shell-bearing bioclastic limestone

Trilobite Pygidium (Tail Segment)

Phylum Arthropoda, Class Trilobita (likely order Phacopida)

Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)

Ammonoidea

Goniatite Fossil

Goniatitida (Order), fossilized in limestone/calcite (CaCO3)

Fossil Coral

Fossilized Scleractinia or Tabulata (various genera/species)

Stromatolite (Jasper-replaced)

Fossilized Stromatolite (Cyanobacteria / Cryptozon / Silica SiO2)

Amber cabochon pendant

Amber (fossilized tree resin; chiefly polymerized terpenoids)

Crinoid Stem Fossil

Crinoid columnal (Echinodermata)

Fossilized Brachiopod/Bivalve in Limestone

Brachiopoda or Bivalvia fossil in Calcite/Limestone (CaCO3)

Fossilized Echinoid Fragment (Calycinal/Boss Fossil)

Echinodermata fossil fragment

Fossil Coral

Hexagonaria / Rugose coral (Fossilized calcium carbonate)

Brachiopod Fossil

Phylum Brachiopoda (Class Rhynchonellata)

Petoskey Stone (Fossilized Rugose Coral)

Hexagonaria percarinata (Calcium Carbonate, CaCO3)

Fossilized Coral (Petoskey Stone type)

Hexagonaria percarinata (Order: Rugosa)

Petoskey Stone

Hexagonaria percarinata

Fossil Coral (Petoskey-style Rugose Coral)

Hexagonaria percarinata (Order: Rugosa)

Fossilized bivalve shell

Recrystallized calcium-carbonate shell, commonly fossil oyster or clam (Bivalvia)

Fossiliferous Limestone Pebble

Biogenic Sedimentary Rock (CaCO3)

Fossil oyster shell

Oyster (family Ostreidae); shell composed chiefly of calcite (CaCO₃)

Fossilized Horn Coral

Rugosa (Rugose Coral)

Fossilized Coral (Rugose or Tabulate) or Stromatolite

Phylum Cnidaria / Stromatolithus

Fossilized Shark Tooth (Partial) or Coprolite

Elasmobranchii (fossil) or Coprolite (trace fossil)

Fossilized oyster or other bivalve shell

Calcitic bioclast, commonly Ostrea spp. or Exogyra spp.

Fossilized Ripple Marks or Stromatolite

Sedimentary ripple mark imprint / Biosedimentary structure

Petrified Wood with Lichen

Silicified Wood (SiO2) colonized by crustose lichens