Fossiliferous Sandstone / Mudstone
Sedimentary Rock (Clastic with Fossiliferous Inclusions)
sedimentary
Category
Organic Specimen (Fossil)
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Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary
Weathered fossiliferous limestone
Calcite-rich limestone (CaCO₃), possibly containing fossil fragments or stylolites
fossil
Coal
Anthracite / Bituminous Coal
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Amber
Succinite (Approximate formula: C10H16O)
Mineraloid
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Polished fossiliferous limestone
Bioclastic limestone, commonly crinoidal limestone (calcite, CaCO₃)
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2 with minor Fe2O3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Polished fossil-bearing amber cabochon (likely insect inclusion)
Fossilized plant resin; commonly Dominican or Baltic amber, chemically a complex diterpenoid resin
fossil
Chert (Jasper/Basalt River Pebble)
Silicon Dioxide (SiO2) or Microcrystalline Quartz
sedimentary
Gastropod Fossil (Internal Mold)
Phylum Mollusca, Class Gastropoda (Steinkern)
sedimentary
Amber (Copal)
Succinate (Fossilized Resin)
mineraloid
Amber
Succinite (C10H16O)
mineral
Petrified Wood / Fossilized Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Weathered Sandstone with Algae Growth
Arenite
sedimentary
Chert (specifically a nodule with Chalcendony/Agate banding)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Petrified Wood
Silicified Wood (SiO2)
Mineral / Fossil
Petrified Wood
Silicified wood (SiO2)
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil
Echinoid Fossil in Flint or Chert Nodule
Echinoidea embedded in sedimentary silica (SiO2)
fossil
Stromatolite (Jasper-replaced)
Fossilized Stromatolite (Cyanobacteria / Cryptozon / Silica SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous limestone
Calcite-rich limestone (CaCO₃), containing fossil shell or coral fragments
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Honeycomb Coral Fossil
Favosites (extinct genus of tabulate coral)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Shale fragment
Shale (Laminated Mudstone)
sedimentary
Likely weathered fossil bone fragment
Indeterminate fossilized bone; taxonomic identification requires microscopy and locality data
fossil
Fossil bivalve shell
Likely an internal mold or mineralized shell of a brachiopod or small bivalve; exact taxonomy requires locality and diagnostic details
fossil
Ironstone Concretion / Hematite Nodules
Ferruginous Sedimentary Rock (primarily Hematite Fe2O3 and Goethite FeO(OH))
sedimentary
Cowrie Shell Fossil
Cypraea sp.
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Jasper/Chalcedony mix)
Microcrystalline Quartz (SiO2)
sedimentary
Land Snail Shell
Gastropoda (Calcium Carbonate, CaCO3)
fossil
Coal
Bituminous Coal (organic sedimentary rock)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary