Mineralized Fossil

Polished fossiliferous limestone, possibly coral or shell fossil

Calcite-rich limestone (CaCO₃), with probable fossilized skeletal structures

Weathered limestone pebble

Limestone, predominantly calcite (CaCO₃), possibly fossiliferous or oolitic

Weathered fossiliferous sandstone or mudstone cobble

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

Weathered limestone or calcareous sandstone

Calcite-rich carbonate rock, chiefly calcium carbonate (CaCO₃), possibly fossiliferous limestone

Trilobite fossil

Trilobita (exact species indeterminable from the image)

Fossiliferous limestone pebble

Calcite-rich limestone, CaCO₃, with possible fossil or shell fragments

Fossilized Crinoid Stem in Limestone

Crinoidea (Class) in Calcium Carbonate (CaCO3) matrix

Fossiliferous Limestone

Limestone with embedded fossil cross-section

Fossil-bearing limestone or calcareous mudstone pebble

Micritic limestone, primarily calcite (CaCO₃), with possible fossil or iron-oxide vein features

Fossilized Shark Tooth

Selachimorpha fossil

Fossil Belemnite Guard

Belemnitella spp. (rostrum)

Tumbled fossiliferous limestone

Crinoidal limestone, chiefly calcite (CaCO₃), with fossil echinoderm fragments

Polished fossil-bearing shale or mudstone

Fossiliferous carbonaceous mudstone/shale; visible fossils may be bivalves or ammonites, but species cannot be confirmed from the image

Fossiliferous limestone pebble

Calcitic limestone, primarily CaCO₃ (calcite), containing a possible trace-fossil or shell fragment

Fossilized Bone Fragment

Vertebrate Fossil

Shale with Trace Fossils

Fissile mudrock (Shale)

Fossiliferous limestone

Bioclastic carbonate rock, predominantly calcite (CaCO₃)

Fossiliferous limestone with colonial coral fossils

Calcitic limestone; probable fossil tabulate or rugose coral (Class Anthozoa)

Fossiliferous Limestone (or Bryozoan/Coral Fossil Pebble)

Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)

Fossiliferous Limestone with Crinoid stems

Limestone (CaCO3) containing Crinoidea fossils

Crinoid Fossil in Limestone

Crinoidea fossil (stalk segments) in Calcium Carbonate (CaCO3) matrix

Quartz Vein in Basalt or Sedimentary Host Rock

Silica-veined lithic fragment (SiO2 in host matrix)

Fossilized gastropod (snail)

Silicified or calcite-replaced gastropod fossil; exact genus indeterminate

Fossil gastropod shell

Gastropoda; species cannot be determined from the image

Dark mineral nodule with white veining

Possibly a calcite-veined manganese- or iron-rich concretion; exact identification requires testing

Fossiliferous limestone

Bioclastic limestone, commonly crinoidal or shelly limestone (calcite, CaCO₃)

Polished fossiliferous agate

Chalcedony (microcrystalline SiO₂) containing fossil fragments, likely an agatized limestone or stromatolite

Fossiliferous Limestone

Fossiliferous Calcilutite / Biomicrite

Fossil Shark Tooth

Selachii fossil

Fossilized Shark Tooth

Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron

Quartz-rich pegmatitic rock with possible epidote or chlorite

Hydrothermal/pegmatitic quartz-bearing rock; identifiable minerals may include quartz (SiO₂), feldspar, and epidote/chlorite

Brecciated jasper

Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich breccia

Painted pebble, likely a smooth river stone

Unidentified fine-grained natural rock; exact lithology cannot be determined from the image

Polished dendritic agate pebble

Chalcedony (microcrystalline SiO₂) with dark manganese- or iron-oxide dendrites

Shark Tooth Fossil

Vertebrate fossilized tooth (various genera such as Carcharodon, Otodus, or Negaprion)

Quartz Vein in Basalt or Mafic Rock

Silicon Dioxide (SiO2) vein in volcanic/mafic matrix

Polished fossiliferous stone egg, likely fossiliferous limestone or marble

Unidentified carbonate rock; likely calcite-rich limestone (CaCO₃), possibly fossil-bearing

Likely fossiliferous limestone fragment

Calcareous fossil assemblage, chiefly calcium carbonate (CaCO₃), possibly crinoid, bivalve, or bryozoan material in limestone

Tumbled fossil shark tooth pendant

Likely fossilized shark tooth, possibly Otodus or Carcharhinus; exact species cannot be confirmed from the image

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃), with a visible fossil shell or fossil fragment

Rounded fossil fragment, possibly fossiliferous limestone

Unidentified carbonate fossil or fossil-bearing limestone; exact fossil cannot be determined from the photograph

Iron-stained quartz-rich rock, possibly weathered granite or quartzite

Indeterminate quartz–feldspar aggregate with iron-oxide staining; likely granitic or hydrothermal material