Fossil brachiopod or bivalve shell
Likely a fossilized brachiopod; precise genus cannot be determined from the photograph
fossil
Category
Sedimentary (Fossil)
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Fossiliferous Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Polished fossilized wood (likely petrified wood)
Silicified wood; commonly quartz (SiO₂) replacing wood tissue
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Tooth or shell fragment (likely fossilized marine material)
Indeterminate; possibly a fossil fish tooth or mollusk shell fragment composed mainly of calcium carbonate (CaCO₃)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3 with organic inclusions)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Horn Coral
Rugosa
fossil
Weathered Sandstone with Algae Growth
Arenite
sedimentary
Petrified Wood
Silicified wood (Quartz pseudomorph after wood)
fossil
Limestone (River Pebble / Fossiliferous Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous limestone, possibly an oyster or other bivalve fossil
Calcite (CaCO₃) shell material preserved in micritic limestone; exact fossil taxon cannot be confirmed from one image
fossil
Chert (Fossiliferous)
Chert (Cryptocrystalline Silica/SiO2)
sedimentary
Weathered sandstone or limestone fragment
Likely quartz-rich sandstone or calcitic limestone; exact identification is uncertain from the image
sedimentary
Fossil Shark Tooth Fragment
Elasmobranchii dentition (fragment)
fossil
Amber
Succinite (organic gemstone, approx. C10H16O)
fossil
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Fossiliferous Limestone with Coral Imprint
Fossiliferous Limestone (CaCO3)
sedimentary
Sandstone (likely Quartzose Sandstone pebble)
Arenite (primarily SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3)
sedimentary
Vuggy Limestone
Carbonate Sedimentary Rock with Vuggy Porosity (CaCO3)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (with Limonite staining)
Arenite (FeOx-rich)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (likely Graywacke or Arkose)
Clastic Sedimentary Rock (primarily SiO2 with various lithic fragments)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Fossiliferous Limestone
Sedimentary Limestone (CaCO3) containing Crinoid or Brachiopod remains
fossil
Silicified fossil-bearing limestone (likely chert/agate replacement)
Microcrystalline quartz (SiO₂) replacing carbonate rock; possible fossiliferous limestone
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Limonite Concretion
Goethite-Limonite (FeO(OH)·nH2O)
sedimentary
Larimar and Fossil Coral
Pectolite (NaCa2Si3O8(OH)) and Hexagonaria/Petoskey Stone
mineral and sedimentary
Possible fossilized ammonite or concretion
Indeterminate fossil specimen; possibly an ammonoid mold/cast in iron-rich sedimentary rock
fossil
Fossiliferous Sandstone / Mudstone
Sedimentary Rock (Clastic with Fossiliferous Inclusions)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil