Fossilized shell or coral fragment
Indeterminate biogenic carbonate; likely calcite/aragonite (CaCO₃)
fossil
Category
Igneous And Fossil
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Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Fossiliferous limestone
Bioclastic carbonate rock, primarily calcite (CaCO₃), containing fossil shell fragments and molds
fossil
Granitic Gneiss
Gneiss (Polymetamorphic Granitic Gneiss)
metamorphic
Polished fossil-bearing shale or mudstone
Fossiliferous carbonaceous mudstone/shale; visible fossils may be bivalves or ammonites, but species cannot be confirmed from the image
fossil
Fossiliferous Limestone
Biogenic Sedimentary Rock (primarily CaCO3)
sedimentary
Bivalve Fossil (Fossilized Shell)
Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)
fossil
Weathered quartz-rich rock or fossil fragment
Indeterminate; likely quartz-bearing sandstone or siliceous fossil material
mineral
Crinoid Stem Fossil in Limestone
Crinoidea (class) in Calcium Carbonate (CaCO3) matrix
fossil
Echinoid Fossil (Commonly called a Sea Urchin or Heart Urchin)
Phylum Echinodermata, Class Echinoidea
sedimentary
Fossil tooth, possibly shark tooth
Indeterminate fossilized vertebrate tooth; likely a shark tooth (possibly *Carcharhinus* or related genus)
fossil
Polished pink granite pebble
Granite, typically quartz–feldspar–mica aggregate
igneous
Weathered iron-rich rock fragment
Indeterminate; likely basaltic or mafic rock with iron-oxide staining
igneous
Basalt in a vesicular volcanic host rock
Basalt, likely with secondary zeolite or calcite infill
igneous
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone
sedimentary
Polished fossiliferous limestone, likely fossil shell fragment
Calcite-rich limestone (CaCO₃), possibly bioclastic/coquina limestone
fossil
Crinoid Fossil in Chert
Siliceous limestone with Crinoidea fossil (SiO2)
sedimentary
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Crinoid Stem Fossil
Crinoid ossicle / stalk segment (Phylum Echinodermata)
fossil
Sandstone (likely Arkose or Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limestone with Stylolites
Calcareous sedimentary rock (CaCO3)
sedimentary
Sandstone
Arenite (typically SiO2 + others)
sedimentary
Sandstone (Quartzose)
Arenite (Siliciclastic sedimentary rock)
sedimentary
Fossilized Shell or Coral Fragment in Matrix
Invertebrate Fossil in Sedimentary Rock
fossil
Amber
Succiniferous fossil resin (C10H16O)
gemstone
Worn River Pebble with Fossil Indentation
Sedimentary Rock with Fossil Infill
sedimentary
Fossilized Bone
Permineralized Bone (Vertebrate Fossil)
fossil
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Amber with Inclusion
Succiniferous fossil resin (C10H16O)
mineraloid
Fossilized Shark Tooth (Partial)
Elasmobranchii (fossil tooth fragment)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
mineral
Petrified Wood (Silicified Wood)
Silicified fossil wood (SiO2)
metamorphic
Fossilized Turritella Gastropod (Internal Mold)
Turritella (Fossil Gastropod Crust)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Tumbled fossiliferous limestone
Bioclastic limestone, likely crinoidal or shell-rich limestone (calcite, CaCO₃)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Fossiliferous Limestone with Quartz Veining
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate with Fossils)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone
sedimentary
Crinoidal Limestone
Bioclastic Limestone
Sedimentary
Fossiliferous limestone pebble
Calcite-rich limestone containing possible brachiopod or coral fossil impressions
fossil