Mineralized Fossil

Petrified Wood / Fossilized Bone

Silicified / Mineralized Fossil (Silica SiO2)

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Weathered quartz-rich rock or fossil fragment

Indeterminate; likely quartz-bearing sandstone or siliceous fossil material

Bivalve seashell

Calcareous shell, primarily aragonite (CaCO₃); likely a modern cockle or related bivalve

Fossil gastropod (snail)

Fossilized gastropod shell, likely a marine mollusk; exact genus cannot be determined from the image

Fossilized Insect in Nodular Matrix

Invertebrata / Insecta fossil in sedimentary concretion

Weathered quartz-rich rock fragment

Likely quartz-bearing sandstone or granitic rock; exact identification is uncertain from the image

Unidentifiable embedded dark fragment

Indeterminate; possibly a dark silicate mineral or lithic inclusion

Likely weathered iron-rich pebble (brown sandstone or ironstone)

Indeterminate ferruginous sandstone/ironstone; commonly quartz (SiO₂) with iron oxides such as goethite and hematite

Light-gray river pebble

Indeterminate; likely fine-grained quartz-rich rock such as quartzite or pale granite

Rounded river pebble

Likely quartz-rich sandstone or weathered chert; exact identification requires testing

Weathered sandstone or iron-rich sedimentary rock

Indeterminate siliciclastic rock; likely quartz-rich sandstone with iron-oxide staining

Fossil bone or tooth fragment

Mineralized fossil vertebrate bone/tooth; exact taxon cannot be determined from the photograph

Likely assorted beach/river pebbles

Undetermined mixed lithologies; visible pieces may include quartz-rich and volcanic rocks

Iron-rich concretion or weathered ironstone

Goethite–hematite limonite aggregate; commonly described as limonite or ironstone

Earth

Terra / Earth

Fossil Rugose Coral (Horn Coral)

Order Rugosa (likely Grewingkia or Heliophyllum species); Calcium Carbonate (CaCO3)

Fossilized bone fragment

Fossil bone, composed chiefly of carbonate-fluorapatite (bioapatite)

Unidentified brown rock fragment

Indeterminate from image; likely a weathered iron-rich lithic fragment

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Unidentified weathered rock fragments

Likely mixed silicate rocks; specific identification requires testing

Petrified Bone (Fossil Bone)

Per mineralization fossil bone (varies by organism, predominantly replacement by SiO2 - Quartz/Chalcedony)

Mixed collection of natural stones

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

Likely weathered iron-rich stone or concretion

Indeterminate; possibly ferruginous sandstone, ironstone, or a weathered sedimentary concretion

Fossiliferous limestone pebble

Calcite-rich limestone (CaCO₃), containing weathered shell or crinoid fragments

Fossilized Chiton (Polyplacophora)

Polyplacophora (fossilized valves)

Petrified Wood

Silicified Wood (SiO2 - Quartz/Chalcedony replacement)

Megalodon Shark Tooth (Partial Fossil)

Otodus megalodon (fossilized in Calcium Phosphate/Apatite)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2 - primarily Quartz/Chalcedony/Opal)

Fossil-bearing limestone, likely with a shell fossil

Bioclastic limestone, composed mainly of calcite (CaCO₃); fossil appears to be a shell or shell cross-section

Small fossilized tooth, possibly a shark tooth

Indeterminate fossil tooth; species cannot be identified from this image

Fossil coral (likely a weathered colonial coral fragment)

Fossilized scleractinian coral; genus and age cannot be determined from the image

Likely fossil oyster shell

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

Possible fossilized bone fragment

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

Fossil-bearing rock, likely a fossilized shell or coral fragment

Unidentified calcitic fossil in a carbonate matrix (likely calcite, CaCO₃)

Fossilized tooth, possibly a shark tooth

Indeterminate fossil tooth; species cannot be identified from this view

Bivalve Fossil (Clam Fossil)

Class Bivalvia (likely Gryphaea or similar Order)

Fossil-bearing limestone

Calcite-rich limestone (mainly CaCO₃), with a possible shell fossil

Fossil Shark Tooth

Carcharodon or Carcharias fossil (Vertebrate Fossil)

Fossilized Gastropod / Coral

Phylum Mollusca / Cnidaria (Silicified or Calcified)

Fossil coral fragment

Likely fossilized colonial coral; exact taxon cannot be determined from the fragment