Fossiliferous Limestone or Mudstone
Sedimentary Rock with Invertebrate Fossils
sedimentary
Category
Igneous And Fossil
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Coarse-grained mafic igneous rock, likely gabbro
Gabbro; chiefly calcium-rich plagioclase feldspar and pyroxene, with possible olivine and amphibole
igneous
Weathered dark igneous rock fragment
Likely basalt or andesite; exact identification is uncertain from the photograph
igneous
Fossilized Shell Fragment
Bivalvia or Gastropoda (Class) fragment
fossil
Fossilized Oyster Shell
Gryphaea or Exogyra (Family Ostreidae)
fossil
Fossiliferous Limestone with Crinoid stems
Calcite-rich Biogenic Sedimentary Rock (CaCO3)
sedimentary
Fossil Coral
Anthozoa fossil (Calcite / SiO2 replacement)
fossil
Biotite granite (weathered)
Granite, primarily quartz (SiO₂), feldspar, and biotite mica
igneous
Tumbled gabbro (likely larvikite or related mafic rock)
Coarse-grained mafic intrusive rock; chiefly plagioclase feldspar, pyroxene, and minor biotite/amphibole
igneous
Fossiliferous limestone
Bioclastic limestone, composed mainly of calcite (CaCO₃)
sedimentary
Weathered granite or granitic gneiss
Quartz–feldspar–mica aggregate; possibly deformed granitic gneiss
igneous
Polished/tumbled pale gray stone, likely quartz-rich river pebble
Probably quartzite or microcrystalline quartz (SiO₂); exact identification requires testing
igneous
Fossil ammonite
Ammonoidea; likely a chambered ammonite mold/cast
fossil
Fossil brachiopod
Brachiopoda; likely a spiriferid or strophomenid brachiopod
fossil
Fossil ammonite
Ammonoidea; likely a chambered ammonite mold/cast
fossil
Ammonite fossil
Fossilized ammonoid cephalopod; likely an involute ammonite, exact genus/species indeterminate
fossil
Ammonite fossil
Fossilized ammonoid cephalopod; likely an indeterminate Jurassic–Cretaceous ammonite
fossil
Fossil Coral
Scleractinia or Anthozoa (Fossilized)
fossil
Triceratops Fossil
Triceratops horridus
fossil
Ammonite Fossil
Ammonoidea (subclass)
fossil
Brachiopod Fossil
Phylum Brachiopoda
fossil
Orthoceras fossil
Orthoceras regulare (Cephalopoda, Orthocerida)
fossil
Coral Fossil
Anthozoa (order Scleractinia)
fossil
Orthoceras Fossil
Orthoceras sp. (Extinct genus of nautiloid cephalopod)
fossil
Ammonite fossil
Ammonoidea; likely a polished small ammonite, possibly Cleoniceras
fossil
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Ammonite fossil
Fossilized ammonoid cephalopod, commonly classified within Ammonoidea
fossil
Brachiopod Fossil
Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)
fossil
Orthoceras Fossil
Orthoceras regulare (Extinct Cephalopod)
fossil
Fossil Coral
Coral Limestone (a type of biogenic sedimentary rock)
Sedimentary
Belemnite Fossil
Belemnitida (Order of extinct cephalopods)
sedimentary
Belemnite Fossil
Belemnitida (extinct order of Cephalopods)
sedimentary
Fossil Coral
Scleractinia (Anthos), primarily Calcium Carbonate (CaCO3)
sedimentary
Ammonite Fossil
Ammonoidea (typically preserved as Calcite CaCO3 or Pyrite FeS2)
sedimentary
Goniatite Fossil
Goniatitida (Order), fossilized in limestone/calcite (CaCO3)
sedimentary
Fossil Coral
Fossilized Scleractinia or Tabulata (various genera/species)
Sedimentary
Coral Fossil
Scleractinia (Fossilized Coral)
fossil
Seashell Fossil
Invertebrate Bivalve / Gastropod Fossil (Calcium Carbonate, CaCO3)
fossil
Seashell Fossil
Mollusca (Bivalvia)
fossil
Fossil Coral
Rugosa or Tabulata / Hexacorallia (replaced with silica or calcite)
fossil
Ammonite Fossil
Ammonoidea
fossil
Flint with Fossil
Silicon dioxide (SiO2) microcrystalline quartz with fossiliferous inclusions
sedimentary