Mineral, Sediment

Milky quartz (likely iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Fossilized Shark Tooth

Bioapatite (Calcium Hydroxyapatite) replacement

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood

Turritella Gastropod Fossil

Turritella (mollusk fossil in sedimentary matrix)

Fossil plant impression slab

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

Graywacke

Lithic Sandstone (Graywacke)

Fossilized bivalve shell fragment

Fossil Mollusca, likely a bivalve (class Bivalvia); exact genus cannot be determined from the image

Shale

Shale (Sedimentary rock composed of mud/clay minerals)

Shark Tooth Fossil

Carcharocles megalodon or similar extinct shark tooth

Banded Sandstone (River Cobble)

Arenite Sandstone with heavy mineral layering

Petrified Coral Fossil (Honeycomb Coral)

Favosites (Rugosa/Tabulate coral fossil replaced by microcrystalline quartz/chalcedony)

Rounded fossiliferous limestone or weathered limestone nodule

Likely bioclastic limestone, composed mainly of calcite (CaCO₃); exact identification is limited by the blurry image

Milky quartz with iron staining

Quartz (SiO₂), likely iron-oxide-stained

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Small translucent quartz fragment

Quartz (SiO₂), possibly milky or near-colorless quartz

Quartz-Veined Mudstone

Argillaceous Mudstone with Quartz Veining

Trilobite fossil in matrix

Trilobita (arthropod fossil; exact species cannot be determined from the image)

Fossilized tooth or tooth fragment

Indeterminate vertebrate tooth; possibly a fossil shark tooth (Carcharodon/Carcharocles)

Limonite (Ironstone) pseudomorph

Limonite (Hydrous ferric oxide), FeO(OH)·nH2O

Fossil bivalve shell

Fossilized mollusk (Bivalvia), likely oyster or related species; exact genus requires locality and preparation

Weathered iron-rich rock (possibly ironstone)

Likely ferruginous sandstone or ironstone; exact identification requires examination

White pebble (likely quartz or milky quartz)

Quartz, SiO₂ (tentative identification from the image)

Drupa Quartz (Sparkly Drusy Quartz on Matrix)

Crystalline Silicon Dioxide (SiO2) on host rock

Fossilized bivalve shell fragment

Calcitic shell material, commonly Arca or related marine bivalve; primarily CaCO₃

Glauconite

Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2

Fossil shell impression or shell-bearing limestone

Indeterminate bioclastic carbonate; likely mollusk fragment preserved in limestone or mudstone

Fossilized Brachiopod

Phylum Brachiopoda

Petrified Wood

Silicified Wood (primarily Quartz / Chalcedony: SiO2)

Fossilized scallop shell fragment

Bivalve shell, composed primarily of calcite (CaCO₃)

Weathered granitic gneiss (probable)

Gneiss, chiefly quartz–feldspar–biotite; compositionally granitic

Sandstone (likely Siltstone variety)

Arenite / Siltstone (primary mineral SiO2)

Possible granite or granitic gneiss pebble

Granite; primarily quartz, feldspar, and mica

Fossilized shell fragment in limestone

Bioclast (likely bivalve or brachiopod) preserved in calcitic limestone

Limonite (Ironstone Concretion)

Limonite (FeO(OH)·nH2O)

Shale (possibly Carbonaceous or Oil Shale)

Laminated Mudstone (primarily clay minerals and quartz)

Fossil gastropod (snail shell)

Fossilized gastropod; original shell likely aragonite or calcite (CaCO₃), now partly mineral-replaced

Fossil tooth fragment

Likely fossilized shark tooth or marine vertebrate tooth; exact taxon cannot be determined from the image

Fossil shark tooth

Likely fossilized shark tooth, possibly Otodus or Carcharhinus; exact identification requires a sharper, closer image

Polished fossil shell fragment

Fossilized bivalve or gastropod shell, likely calcitic/aragonitic carbonate

Fossilized Shark Tooth

Chondrichthyes tooth