Igneous And Fossil

Fossilized wood or bone fragment

Indeterminate permineralized organic fossil; possibly silicified wood or fossil bone

Rounded river pebble, likely basalt or dark volcanic rock

Probably fine-grained basalt; exact identification requires testing

Unidentified weathered rock fragments

Likely mixed silicate rocks; specific identification requires testing

Shark Tooth Fossil

Elasmobranchii fossil (likely Carcharias or Odontaspis sp.)

Petrified Wood

Silicified Wood (SiO2)

Fossilized Brachiopod or Gastropod in Chert/Limestone

Phylum Brachiopoda / Mollusca

Fossil Shell (Bivalve)

Class Bivalvia (fossilized)

Fossilized Bone

Fossilized Vertebrate Bone (Per mineralized)

Fossilized Shark Tooth

Chondrichthyes (Class) - likely Carcharodon or Otodus genus

Fossilized Crinoid Stem in Pebble

Crinoidea (Class) preserved in calcite/matrix

Shark Tooth Fossil

Chondrichthyes (class) fossilized tooth

Fossilized Brachiopod in Limestone

Phylum Brachiopoda embedded in sedimentary limestone

Sand Tiger Shark Tooth

Carcharias taurus

Gastropod Fossil (Snail Internal Cast)

Class Gastropoda (Steinkern)

Fossilized shark tooth

Fossil shark tooth; exact shark species cannot be determined from this image

Fossiliferous Limestone

Biogenic Calcium Carbonate (CaCO3)

Likely fossiliferous limestone fragment

Calcitic limestone, chiefly calcium carbonate (CaCO₃; mineral calcite)

Fossiliferous sandstone with plant fossils

Likely fossil-bearing siliciclastic sedimentary rock; apparent fragments may be fossil wood or leaf impressions, but species cannot be determined from the image

Chert Cobble with Crinoid Fossil

Silica (SiO2) with Crinoid ossicle

Fossiliferous Limestone

Fossiliferous Limestone

Fossiliferous limestone pebble

Calcite-rich limestone (primarily CaCO₃), with possible fossil or fossil-fragment patterns

Weathered metamorphic rock, likely mica schist or gneiss

Quartz–feldspar–mica schist/gneiss; exact identification is uncertain from the photograph

Ammonite Fossil

Ammonoidea subclass (calcium carbonate / silica replacement)

Fossilized Tooth Fragment

Vertebrate Fossil (Mammalia indet.)

Chert with Crinoid Fossil Impression

Microcrystalline Quartz (SiO2) with Crinoidea fossil impression

Weathered limestone or dolostone

Micritic limestone, primarily calcite (CaCO₃), possibly dolomite (CaMg(CO₃)₂)

Fossil oyster shell

Fossilized bivalve, likely an oyster (family Ostreidae); exact genus and age are indeterminable from the image

Granite pebble

Granite; predominantly quartz, feldspar, and mica

Weathered granite (likely granitic river cobble)

Granite; predominantly quartz, feldspar, and mica

Granite boulder

Granite, composed mainly of quartz, alkali feldspar, plagioclase, and minor mica/amphibole

Granite (likely biotite granite)

Coarse-grained granitic rock; chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Fossil Brachiopod

Phylum Brachiopoda

Ammonite Fossil

Ammonoidea

Ironstone Concretion

Ironstone (primarily Siderite or Limonite / Goethite, FeO(OH)·nH2O)

Vesicular volcanic rock, likely pumice or scoria

Pumice/scoria; predominantly volcanic glass with feldspar, pyroxene, and possibly olivine

Vesicular volcanic scoria (likely basaltic scoria)

Scoria; predominantly vesicular basalt, composed mainly of plagioclase, pyroxene, and iron-rich glass

Vesicular basalt

Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and commonly olivine

Vesicular volcanic scoria (likely basaltic scoria)

Scoria; predominantly iron- and magnesium-rich silicate glass with plagioclase, pyroxene, and possible olivine

Fossil Shell (Brachiopod or Mollusk)

Phylum Brachiopoda or Class Bivalvia (e.g., Mucrospirifer or similar genus)

Fossil Shell

Phylum Mollusca (Gastropod fossil)

Mixed collection of natural stones

Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks

Crinoid Stem Fossil

Crinoid columnal (Echinodermata)