Sedimentary (Fossilized)

Amber

Succinates (Fossilized Resin)

Amber

Succinite (fossilized resin)

Amber

Succinite (fossilized resin)

Amber

Succinite (fossilized resin)

Polished fossil tooth or jaw fragment

Indeterminate vertebrate dental/bone fossil; likely mineralized enamel and dentine

Sandstone (Cross-bedded Drill Core)

Clastic Sedimentary Rock (primarily SiO2)

Possible fossilized shell or fossil fragment

Indeterminate; possibly a small brachiopod or gastropod fossil in mineralized matrix

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (C10H16O)

Fossilized Plant or Tree Bark

Lepidodendron or Sigillaria (example genera)

Fossilized Wood / Petrified Wood

Petrified Wood (Silicified Flora)

Fossilized vertebra, likely mammalian

Mineralized vertebral centrum and neural arch; exact taxon indeterminate from the image

Petrified Wood (Jet or Coalified Wood appearance)

Silicified wood (principally SiO2) or Carbonized Wood

Picture Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Chert (with Calcite layering)

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)

Rugose Coral Fossil

Rugosa (Order)

Fossil Rugose Coral (Horn Coral)

Order Rugosa (likely Grewingkia or Heliophyllum species); Calcium Carbonate (CaCO3)

Calamites (Fossil Plant)

Calamites (Genus), belonging to the class Equisetopsida

Horn Coral Fossil

Rugosa (Order Rugosa)

Amber

Succinite (a fossilized organic resin containing succinic acid)

Amber

Succinrite (Organic Gemstone)

Fossilized shell or bone fragment

Indeterminate biogenic carbonate/phosphate fossil; likely a fragment of fossil shell or small vertebrate bone

Fossilized Echinoid / Sea Urchin Internal Mold

Echinoidea internal cast (steinkern)

Petrified Wood

Silicified Wood (SiO2)

Fossil Shell (Bivalve)

Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3

Fossil shell fragment, likely bivalve or brachiopod

Indeterminate fossilized mollusk/brachiopod; commonly calcite (CaCO₃)

Fossilized shell or coral fragment

Likely silicified or calcitic marine invertebrate fossil; exact taxon indeterminate from the image

Sandstone

Arenite (primarily SiO2)

Glauconitic Sandstone (Greensand pebble)

Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)

Chert (containing fossil leaf impression)

Microcrystalline silicon dioxide (SiO2)

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Honeycomb Coral Fossil (Favosites)

Favosites alpenensis

Polished fossil shell or bone fragment (tentative)

Indeterminate biogenic carbonate or fossilized bone; possibly a small gastropod/bivalve fragment

Chert / Fossilized Burrow Cast

Microcrystalline Quartz (SiO2) with Trace Carbonates

Fossilized Oyster (Gryphaea or Exogyra)

Crassostrea / Gryphaea (Bivalvia)

Fossilized shell or coral fragment

Indeterminate biogenic carbonate; likely calcite/aragonite (CaCO₃)

Crinoid Stem Fossil

Class Crinoidea (Sea Lilies)

Fossil bivalve shell, likely oyster or related mollusk

Fossilized oyster-like bivalve; exact genus and age cannot be determined from the photograph

Fossilized Coral (Petoskey Stone / Charlevoix Stone type)

Hexagonaria percarinata (or similar Favositidae/Rugosa coral)

Echinoid Fossil / Fossilized Sea Urchin

Echinoidea

Fossilized bivalve or ammonite fragment

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

Travertine

Calcareous Tufa (CaCO3)

Palm Wood Fossil

Palmoxylon