Oyster Shell (Biogenic Calcium Carbonate)
Crassostrea virginica (or related species) - Calcium Carbonate (CaCO3)
sedimentary
Category
Sedimentary (Fossilized)
Browse sedimentary (fossilized) specimens identified by the Rock Identifier community.
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Fossil Shark Tooth
Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)
fossil
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet.
fossil
Agatized fossil nodule, possibly silicified wood or bone
Microcrystalline quartz (chalcedony), SiO₂, replacing fossil material
fossil
Tufa (Vesicular Limestone)
Tufa (form of Calcium Carbonate, CaCO3)
sedimentary
Crinoid Stem Fossil
Crinoid columnal (Class Crinoidea)
sedimentary
Crinoid Stem Fossil (in Chert or Limestone Matrix)
Crinoidea (Class) - Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Septarian Nodule (Dragon Stone)
Septarian concretion (composition: Calcium Carbonate / Calcite, Aragonite, and Limestone/Clay)
sedimentary
Likely fossilized shell or carbonate concretion
Indeterminate biogenic calcium carbonate, commonly calcite (CaCO₃)
fossil
Fossiliferous Limestone with Fossil Fragment
Fossiliferous Limestone (CaCO3 with organic remains)
fossil
Petrified Wood / Red Jasper
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Fossiliferous limestone
Bioclastic carbonate rock, chiefly calcite (CaCO₃), containing marine fossil fragments
sedimentary
Fossiliferous limestone
Bioclastic carbonate rock, chiefly calcite (CaCO₃), containing a likely colonial coral or bryozoan fossil
fossil
Ammonite fossil
Ammonoidea; likely a Jurassic or Cretaceous ammonite
fossil
Fossilized Trilobite or Mollusk Fragment
Phylum Arthropoda / Mollusca fossil in sedimentary matrix
fossil
Fossiliferous Limestone with Rugose Coral
Rugosa (order), typically preserved in CaCO3 (Calcite)
sedimentary
Crinoid Stem Fossil
Crinoid columnal (Echinodermata)
fossil
Amber
Succinates (Organic Gemstone)
mineral
Fossilized Fish Skeleton in Matrix
Vertebrata (Class: Actinopterygii), typically found in limestone or shale matrices
sedimentary
Petrified Wood
Fossilized Wood (SiO2 replacing organic matter)
fossil
Chert with Fossil inclusions
Microcrystalline Quartz (SiO2) with biogenic inclusions
sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites (Extinct genus of tabulate coral)
sedimentary
Calamites Fossil (Horsetail Stem)
Calamites (Genus), part of the class Equisetopsida
sedimentary
Coral Fossil (Scleractinia)
Scleractinia (Order), primarily CaCO3 (Aragonite or Calcite)
sedimentary
Jasper with Manganese Dendrites
Silicon Dioxide (SiO2) with Oxide Mineral Inclusions
sedimentary
Sandstone Cobble with Liesegang Rings
Arenite with iron oxide precipitation (SiO2 matrix with Fe2O3 banding)
sedimentary
Liesegang Banded Sandstone (Wonderstone)
Ferruginous Sandstone with Liesegang Rings
sedimentary
Fossilized Shark Tooth
Elasmobranchii tooth (commonly Otodus or Scapanorhynchus sp.)
fossil
Possible fossilized ammonite or concretion
Indeterminate fossil specimen; possibly an ammonoid mold/cast in iron-rich sedimentary rock
fossil
Amber
Succinite (Fossilized Resin)
gemstone
Amber
Succinite (Fossilized Resin)
gemstone
Amber
Succinite (Fossilized Resin)
fossil
Baltic Amber
Succinite (fossilized resin)
fossil
Amber
Fossilized Tree Resin
gemstone
Amber (Copal)
Succinate (Fossilized Resin)
mineraloid
Amber
Succinite (fossilized resin)
mineraloid
Amber
Succinite (fossilized resin)
mineral
Amber
Succinite (fossilized resin)
mineral
Amber
Fossilized Resin (C10H16O)
mineral
Amber
Fossilized Tree Resin
gemstone
Amber
Fossilized Tree Resin
gemstone