Oolitic Chert
Silicon Dioxide (SiO2) with oolitic texture
sedimentary
Category
Sedimentary (Fossil)
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Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata
sedimentary
Coquina
Coquina (Limestone variant)
sedimentary
Fossilized Coral (Petoskey Stone / Favosites)
Hexagonaria percarinata / Favosites sp. (Calcite, CaCO3)
fossil
Handaxe with Inlaid Fossil Echinoid
Flint / Chert (SiO2) containing a fossil Conulus albogalerus
sedimentary (cryptocrystalline silica)
Coral Fossil (Fossilized Coral)
Hexagonaria or similar rugose/tabulate coral fossil (Calcium Carbonate, CaCO3)
fossil
Sandstone
Arenite
sedimentary
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Sandstone (Siltstone or Fine-grained)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (Nodular)
Chert (SiO2 - Microcrystalline Quartz)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (likely Siltstone variety)
Arenite / Siltstone (primary mineral SiO2)
sedimentary
Chalk (Limestone variant)
Calcium Carbonate (CaCO3)
sedimentary
Coal (Bituminous)
Sedimentary carbonaceous rock
sedimentary
Gastropod Fossil (Snail Stone or Steinkern)
Class Gastropoda (Calcium Carbonate - CaCO3 / Silica - SiO2 replacing original shell)
sedimentary
Fossil Coral (likely Favosites or Honeycomb Coral)
Class Anthozoa, Order Tabulata, Genus Favosites
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide cement
sedimentary
Chert (often called Flint in this variation)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Coral in Chert
Anthozoa (Class) fossil in Cryptocrystalline Quartz (SiO2)
fossil
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Bored Siltstone (Holey Rock)
Siltstone with Pholad borings (Lithophaga/Pholadidae trace fossils)
sedimentary
Hag Stone
Perforated sedimentary rock (typically flint, chert, or limestone)
sedimentary
Fossilized coral or carbonate fossil fragment
Calcareous fossil, likely colonial coral (order Hexacorallia; uncertain from image)
fossil
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Fossil Shark Tooth
Elasmobranchii tooth fossil (e.g., Otodus / Carcharocles)
fossil
Fossilized Shark Tooth (Drum Fish Tooth/Pavement Tooth)
Sparidae or Sciaenidae (Crushing plate dental fossil)
fossil
Sandstone
Sandstone (composed predominantly of Quartz, SiO2)
sedimentary
Polished dendritic jasper or agate slab
Microcrystalline quartz (SiO₂), likely jasper with chalcedony and iron/manganese dendrites
mineral
Turritella Agate / Fossiliferous Limestone
Elimia tenera in Chalcedony/Calcite Matrix
fossil
Fossil Coral
Hexagonaria or similar rugose/tabulate coral fossil (Calcium Carbonate, CaCO3)
fossil
Red sandstone fragment
Ferruginous sandstone, chiefly quartz (SiO₂) with iron-oxide cement
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Weathered sandstone or iron-stained sedimentary pebble
Quartz-rich sandstone; exact identification requires a fresh surface and tests
sedimentary
Brachiopod Fossil (Spiriferid)
Phylum Brachiopoda, Order Spiriferida (CaCO3 - Calcium Carbonate)
sedimentary (fossilized organic remains)
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Orthoceras Fossil
Orthoceras regulare
fossil