Fossiliferous Limestone
Biogenic Sedimentary Rock / CaCO3 with fossil fragments
sedimentary
Category
Mineralized Fossil
Browse mineralized fossil specimens identified by the Rock Identifier community.
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Likely limestone or calcareous fossil fragment
Calcite-rich carbonate rock; possibly bioclastic limestone (CaCO₃)
sedimentary
Shark Tooth Fossil
Carcharhiniformes or Lamniformes (order level fossil)
fossil
Fossilized Gastropod Shell
Gastropoda (Class) replacement / internal cast (steinkern)
fossil
Coprolite
Fossilized Feces
fossil
Polished orbicular jasper (likely ocean jasper)
Silicified microcrystalline quartz/chalcedony with iron-oxide-rich orbicules; commonly called Ocean Jasper
mineral
Fossil Shark Tooth (Sand Tiger Shark type)
Carcharias sp. (likely Odontaspis)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Coprolite
Coprolite (fossilized feces)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Limonite Concretion
Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Limestone with Calcite Crust
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone (likely Red/Brown Sandstone)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)
fossil
Shale (possibly Carbonaceous or Oil Shale)
Laminated Mudstone (primarily clay minerals and quartz)
sedimentary
Limestone with Calcite Veining
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Dendritic Agate or Manganese Nodule in Chert/Limestone
Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions
sedimentary
Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
mineral
Crinoid Stem Fossil in Limestone
Crinoidea (class) in Calcium Carbonate (CaCO3) matrix
fossil
Flint / Chert
Silicon Dioxide (SiO2)
sedimentary
Vesicular basalt (likely weathered scoria)
Basaltic volcanic rock; chiefly plagioclase, clinopyroxene, and olivine with vesicles
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Gastropod Fossil
Class Gastropoda (fossilized)
fossil
Crinoid Stem Fossil
Crinoid ossicle (Phylum Echinodermata)
fossil
Horn Coral Fossil
Rugose coral (Order Rugosa)
fossil
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Sandstone/Quartzite
Sedimentary Rock (composed mainly of SiO2)
sedimentary
Sandstone (with potential Concretion or Fossil fragment)
Arenite (primarily SiO2)
sedimentary
Sandstone (Banded)
Arenite
sedimentary
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class), often found as calcitic fossils
sedimentary
Petrified Wood (Silicified Wood)
Silicified fossil wood (SiO2)
metamorphic
Weathered limestone or calcareous sandstone
Likely micritic limestone (calcite, CaCO₃), possibly carbonate-rich sandstone
sedimentary
Jasper (likely Kambaba or Crocodile Jasper variety)
Silicon Dioxide (SiO2) with inclusions
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Sandstone
Arenite (primary component SiO2)
sedimentary