Sedimentary (Fossilized Organic Remain)

Kambaba Jasper

Stromatolite Jasper (Microcrystalline Quartz)

Fossilized Shark Tooth (Fragment)

Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)

Fossil Shark Tooth

Chondrichthyes dentition (Fossilized Tooth)

Fossilized shell

Indeterminate bivalve shell; likely calcitic or aragonitic shell material (CaCO₃)

Petoskey Stone

Hexagonaria percarinata (Calcite / CaCO3)

Unakite

Metamorphosed Granite (Epidotized Feldspar and Quartz)

Fossilized mammoth molar fragment

Proboscidean molar enamel and dentine, commonly Mammuthus spp.

Fossilized Echinoid

Echinoidea (likely of the order Echinoidea)

Polished amber-like agate or jasper carving

Likely chalcedony (microcrystalline SiO₂), possibly iron-stained carnelian/jasper; exact identification requires testing

Fossilized Brachiopod

Phylum Brachiopoda (likely Order Spiriferida or Orthida)

Rough amber-like brown mineral specimen

Uncertain from photograph; possibly iron-stained quartz, common opal, or resinous amber

Sandstone with Iron Concretion

Arenite with Limonite/Goethite Concretion

Fossil brachiopod shell

Brachiopoda; exact genus and species cannot be determined from the image

Fossiliferous Limestone with Crinoid stems

Limestone (CaCO3) containing Crinoidea fossils

Polished amber cabochon pendant

Amber (fossilized plant resin), chiefly polymerized succinite; approximate formula C10H16O

Fossilized wood fragment

Petrified wood; commonly silicified fossil wood (SiO₂ replacing organic tissue)

Cockle Shell Fossil

Cardium (Bivalvia)

Dendritic Siltstone

Siltstone with Manganese Oxide dendrites (MnO2)

Fossilized Wood (Petrified Wood)

Agatized wood (primarily SiO2)

Petoskey Stone (Fossilized Coral)

Hexagonaria percarinata

Chert / Flint (Brecciated or Fossiliferous Limestone with Silicification)

Sedimentary cryptocrystalline quartz (SiO2)

Coprolite

Coprolite

Amber

Succinite (C10H16O)

Fossilized Shell Impression / Siltstone Fossil

Bivalvia / Brachiopoda mold in Siltstone

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Fossilized wood (petrified wood), likely silicified

Petrified wood; predominantly microcrystalline quartz (SiO₂) replacing wood tissue

Tiger's Eye

Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2

Fossilized Coral

Rugose Coral (Order Rugosa) or Tabulate Coral

Fossiliferous Flint or Chert with Bryozoan Fossils

Sedimentary cryptocrystalline quartz (SiO2) with fossil inclusions

Fossilized bivalve in sandstone/conglomerate

Indeterminate fossil mollusk, likely Bivalvia, preserved in lithified siliciclastic sediment

Oyster shell (fossil or recent shell)

Oyster shell, likely *Crassostrea* or a related bivalve; composed mainly of calcium carbonate (calcite/aragonite)

Amber

Succinite (C10H16O)

Fossil gastropod shell

Fossilized marine gastropod; exact genus/species requires locality and examination

Fossilized Coral (Petoskey Stone / Favosites)

Hexagonaria percarinata / Favosites sp. (Calcite, CaCO3)

Amber

Fossilized Tree Resin (Amorphous Hydrocarbon)

Agate Geode

Silicon Dioxide (SiO2) - Banded Chalcedony with Quartz

Polished fossil gastropod shell

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

Fossilized Coral

Rugose coral / Tabulate coral fossil in limestone matrix

Tumbled amber

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin

Sandstone (Limonitic/Arkose)

Sandstone (primarily SiO2 with FeO(OH)·nH2O)

Sandstone

Arenite (primarily SiO2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Coral)