Sedimentary (Fossil)

Ammonite fossil

Fossilized ammonoid cephalopod; likely an involute ammonite, exact genus/species indeterminate

Likely polished/tumbled fossil shell or concretion

Indeterminate; possibly a fossil bivalve or gastropod in mineralized matrix

Chalcedony (Tumbled)

Silicon Dioxide (SiO2)

Vesicular basalt (possibly amygdaloidal basalt)

Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and commonly olivine; cavities may contain secondary zeolites, calcite, or quartz.

Dinosaur Claw Fossil

Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)

Polished fossil shell or bone fragment (tentative)

Indeterminate biogenic carbonate or fossilized bone; possibly a small gastropod/bivalve fragment

Fossil oyster shell

Fossilized bivalve, likely Ostrea or Crassostrea; calcite (CaCO₃) shell

Fossilized bone fragment, possibly vertebrate tooth or jaw

Mineralized vertebrate bone; commonly apatite [Ca5(PO4)3(F,OH,Cl)] replacing original bone

Fossilized bone

Petrified bone; commonly fossil vertebrate bone composed largely of hydroxyapatite and silica/calcite replacement minerals

Fossiliferous Limestone / Coral Fossil

Fossiliferous Limestone with Anthozoa (Coral) fossil

Fossilized Coral

Anthozoa (Fossilized)

Trilobite Pygidium (Tail Segment)

Phylum Arthropoda, Class Trilobita (likely order Phacopida)

Coral Fossil (Agatized Coral or Petoskey Stone)

Hexagonaria percarinata (if Petoskey) or generally Scleractinia (Agatized Coral)

Fossilized Shark Tooth (Otodus obliquus)

Otodus obliquus (Mineral composition: Bio-apatite/Calcium Phosphate replaced by various minerals)

Fossilized Sea Urchin (Echinoid)

Echinoidea (Class); commonly Clypeasteroida for sand dollar types

Dinosaur Bone

Agatized Dinosaur Bone

Fossilized Sand Tiger Shark Tooth

Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)

Petrified Wood

Fossilized wood / Silicified wood

Kambaba Jasper

Stromatolite

Fossil in Shale

Fossiliferous Shale

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

Sedimentary Outcrop (Sandstone/Shale)

Sedimentary bedrock formation (variable composition)

Fossiliferous limestone

Bioclastic limestone, predominantly calcite (CaCO₃)

Likely fossil oyster shell

Fossilized bivalve shell; exact species cannot be identified from the image

Fossiliferous Limestone (or Bryozoan/Coral Fossil Pebble)

Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)

Possible fossilized bone fragment

Indeterminate fossil bone; no species can be identified from this image

Rounded sedimentary pebble

Likely micritic limestone or calcareous sandstone

Fossiliferous limestone concretion

Calcite-rich limestone (primarily CaCO₃), possibly containing a fossil shell or coral fragment

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

Fossiliferous Limestone or Shale

Biomicrite (if limestone) or Fossiliferous Shale

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

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Fossiliferous limestone (likely a crinoidal or shell-fragment limestone)

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

Fossiliferous limestone, possibly coral-bearing

Calcitic limestone (mostly CaCO₃; fossil fragments may include ancient colonial coral or shell material)

Chert with Fossil Brachiopod

Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion

Fossiliferous limestone

Bioclastic carbonate rock; predominantly calcite (CaCO₃), with fossil shell fragments

Fossil gastropod shell

Gastropoda; species cannot be determined from the image

Seashell Fossil

Gastropoda fossil

Fossil-bearing Sedimentary Rock

Sedimentum cum fossili

Fossilized Shark Tooth (Partial) or Coprolite

Elasmobranchii (fossil) or Coprolite (trace fossil)

Weathered fossiliferous sandstone or mudstone cobble

Lithified siliciclastic sediment; the raised curved feature may be a trace fossil or shell impression

Weathered fossiliferous limestone

Calcitic limestone; predominantly calcium carbonate (CaCO₃), commonly containing fossil fragments