Igneous And Fossil

Orthoceratid Fossil in Limestone

Orthoceras (extinct genus of Nautiloid Cephalopod)

Vesicular basalt (weathered lava rock)

Basalt, a fine-grained mafic volcanic rock composed chiefly of plagioclase feldspar, pyroxene, and commonly olivine

Polished orbicular granite (likely larvikite or orbicular diorite)

Quartz/feldspar-bearing granitoid with dark amphibole–biotite minerals; exact variety requires testing

Brachiopod Fossil in Limestone

Phylum Brachiopoda embedded in sedimentary rock

Fossilized Horse Tooth

Equus sp. (Tooth)

Fossilized Bone

Permineralized Vertebrate Bone

Fossilized Tooth

Vertebrate Fossilized Tooth (Mineralized Biogenic Material)

Crinoid Stem Fossil in Matrix

Crinoid (Class Crinoidea) in Limestone/Siltstone matrix

Vesicular basalt (scoria-like volcanic rock)

Vesicular basalt, primarily plagioclase feldspar, pyroxene, and olivine

Pumice

Vesicular volcanic glass, typically rhyolitic to dacitic; mainly silica-rich volcanic glass with feldspar and minor quartz or pyroxene

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Polished fossiliferous limestone

Fossiliferous micrite/bioclastic limestone, likely crinoidal or shell-rich limestone

Fossiliferous limestone

Calcarenite/bioclastic limestone, predominantly calcite (CaCO₃)

Fossil plant impression slab

Fossilized plant compression/impression; exact taxon indeterminate from the image

Weathered limestone or dolostone

Calcite-rich limestone (CaCO₃), possibly dolomite-bearing

Pyrite

Iron Sulfide (FeS2)

Granite

Coarse-grained felsic intrusive rock, chiefly quartz, feldspar, and mica (biotite/muscovite)

Fossil coral in limestone

Fossilized colonial coral, likely tabulate or favositid coral (CaCO₃), preserved in calcitic limestone

Fossilized oyster shell

Ostrea/Exogyra sp.; calcium carbonate (mostly calcite)

Weathered felsic igneous rock, likely granite or rhyolite

Granite–rhyolite composition; chiefly quartz, alkali feldspar, plagioclase, and minor mica/iron oxides

Fossiliferous pebble, possibly a crinoid or shell fragment

Indeterminate bioclast in a dark sedimentary matrix; likely carbonate fossil material (calcite, CaCO₃)

Tumbled fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃)

Chert or flint with chalcedony/quartz veins

Microcrystalline silica: primarily quartz (SiO₂), including chalcedony; possible fossiliferous limestone or silicified material

Fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃)

Fossiliferous shale or mudstone with a brachiopod fossil

Likely a spiriferid brachiopod fossil in dark shale/mudstone; exact species and age require locality and examination

Vesicular basalt pebble

Basalt, typically plagioclase–pyroxene–olivine with secondary iron oxides

Tumbled basalt (vesicular volcanic stone)

Basalt, a fine-grained mafic volcanic rock composed chiefly of plagioclase feldspar and pyroxene, with possible olivine and iron oxides

Polished septarian-style jasper or rhyolite

Likely silica-rich volcanic rock, possibly rhyolite, with iron-oxide and manganese-oxide veining

Brachiopod Fossil

Phylum Brachiopoda (order potentially Spiriferida)

Bivalve Fossil (Internal Mold)

Bivalvia (Phalladomya or similar genus)

Mosasaur Tooth

Mosasaurus beaugei (Fossilized Tooth)

Mosasaur Tooth Fossil

Mosasauridae (likely Prognathodon or Plioplatecarpus)

Sandstone with Fossil Leaf Impression

Sedimentary rock (Sandstone/Siltstone matrix) with Carbonaceous film fossil

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Fossilized Bivalve Shell

Bivalvia (Phylum Mollusca)

Fossilized Shark Tooth

Chondrichthyes tooth

Mammoth or Mastodon Tooth Fragment

Mammuthus / Mammut molar fragment

Fossil Brachiopod or Mollusk Cast

Phylum Brachiopoda / Mollusca internal mold

Fossil Shark Tooth

Chondrichthyes (Class)

Fossil Snail

Gastropoda (fossilized)

Fossilized Fish (Lepidotes)

Lepidotes sp. (Order: Lepisosteiformes)

Fossil Bone Fragment

Petrified bone (permineralized hydroxyapatite)