Conical fossil shell or shell fragment
Likely a gastropod shell fragment; exact taxon indeterminate from the image
fossil
Category
Sedimentary (Fossil)
Browse sedimentary (fossil) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
fossil
Mixed Mineral and Fossil Collection
Multi-specimen assemblage (SiO2, CaCO3, FeS2, etc.)
mineral
Megalodon Shark Tooth Fossil
Otodus megalodon
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Shale
Shale (composition varies: primarily clay minerals and quartz)
sedimentary
Rounded gray pebble
Uncertain; likely quartz-rich sandstone, quartzite, or graywacke
sedimentary
Flint / Chert Nodule
Silica (Microcrystalline Quartz), SiO2
sedimentary
Septarian Nodule (Dragon Stone)
Septarian concretion (CaCO3 with Aragonite and Calcite)
sedimentary
Fossiliferous Limestone Pebble
Sedimentary Rock (CaCO3)
sedimentary
Ammonite Fossil in Matrix
Ammonoidea subclass (e.g., Arietites or similar genera)
fossil
Conglomerate
Conglomerative Sedimentary Rock
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chalcedony (Common Opal variant)
Silicon dioxide (SiO2) with varying levels of hydration
mineral
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet.
fossil
Hag Stone (Holey Rock / Fossiliferous Limestone)
Limestone (CaCO3) with natural erosion / fossil cavities
sedimentary
Sandstone with Dendritic Manganese Oxides
Sandstone (SiO2 predominant) with Oxide Dendrites (MnO2)
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil
Sandstone (Greywacke)
Arenite / Wacke (SiO2 + varied clasts)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Stream-rounded)
Arenite (SiO2 based)
sedimentary
Fossiliferous Limestone
Calcareous biomicrite / Bioclastic limestone
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (likely Quartzose Sandstone with mineral staining)
Arenite (composed mainly of SiO2)
sedimentary
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil
Mosasaur Tooth
Mosasaurus beaugei (Fossilized Tooth)
fossil
Fossiliferous Limestone
Limestone (CaCO3 - Calcium Carbonate)
sedimentary
Fossilized Gastropod (Snail)
Class Gastropoda (internal mold or 'steinkern')
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic inclusions
sedimentary
Kambaba Jasper
Stromatolite Jasper (Microcrystalline Quartz with Cyanobacteria fossile)
sedimentary
Oyster shell fragment
Ostreidae shell; primarily calcite (CaCO₃)
fossil
Ironstone Concretion
Ferruginous Concretion (Fe2O3·nH2O)
sedimentary
Dinosaur Skull Fossil (Velociraptor Replica)
Velociraptor mongoliensis fossil specimen in sedimentary matrix
sedimentary
Stromatolite
Biogenic Sedimentary Rock (Precambrian Stromatolite fossil)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Sandstone
Arenite (Sandstone)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Wood (Petrified Wood) and Associated Rocks
Silicified Wood / Xylopal
fossil