Sedimentary (Fossil)

Fossilized bivalve shell

Fossil mollusk, likely an oyster or similar bivalve; original shell composed of calcium carbonate (aragonite/calcite)

Likely quartz-rich stone or shell fragment

Uncertain; possibly quartz (SiO₂) or a calcareous shell fragment (CaCO₃)

Sandstone (Calcareous or Quartz-rich)

Arenite

Sandstone (lithic wake/graywacke variety)

Arenite/Greywacke (SiO2 with lithic fragments)

Sandstone

Arenite

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (primarily SiO2)

Sandstone (River Stone)

Arenite (primarily SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sandstone

Arenite

Gastropod Fossil (Internal Mold)

Phylum Mollusca, Class Gastropoda (Steinkern)

Fossiliferous limestone

Bioclastic carbonate rock, chiefly calcite (CaCO₃)

Petrified Wood

Siliconized Wood (SiO2)

Weathered sedimentary cobble, likely limestone or calcareous sandstone

Indeterminate carbonate-rich clastic rock; possibly micritic limestone or calcarenite

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclasts

Crinoidean Fossil (Stem Fragment)

Phylum Echinodermata, Class Crinoidea

Fossiliferous Flint / Chert

Microcrystalline quartz (SiO2) with embedded invertebrate fossils

Sandstone (with vugs)

Arenite / Sedimentary Sandstone

Weathered limestone

Calcite-rich limestone (CaCO₃), possibly fossiliferous or bioclastic

Banded jasper (polished/tumbled)

Microcrystalline quartz (SiO₂), commonly iron-oxide– and clay-rich chert

Sandstone / Limestone

Sedimentary Rock (Quartz Sandstone or Calcareous Grainstone)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Fossiliferous Limestone with Rugose Coral

Calcite (CaCO3) matrix containing Rugosa (order of extinct solitary and colonial corals)

Fossiliferous Limestone with Brachiopod

Phylum Brachiopoda in Sedimentary Matrix (CaCO3)

Fossiliferous shale or slate with plant impressions

Carbonaceous mudstone/shale; possible fossil plant material (often fern-like impressions)

Crinoid Marble (Fossilized Limestone)

Crinoidal Limestone (comprising Calcite/Aragonite CaCO3)

Limestone

Micritic limestone, chiefly calcite (CaCO₃)

Fossiliferous limestone pebble

Bioclastic limestone, chiefly calcite (CaCO₃)

Fossiliferous Limestone (Crinoidal)

Crinoid Limestone (CaCO3 with fossil biological remains)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Likely weathered gray limestone or shale fragment

Calcite-rich carbonate rock (limestone), possibly calcareous shale

Fossil shell impression or shell-bearing limestone

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

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

Polished fossiliferous limestone (likely orbicular/fossil limestone)

Fossiliferous micritic limestone, composed primarily of calcite (CaCO₃)

Glauconitic Sandstone

Glauconitic Sandstane (containing K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Calcite rosette (possibly fossilized shell fragment)

Calcite, CaCO₃; crystal habit appears botryoidal/rosette-like

Fossilized Shark Tooth

Fossilised Chondrichthyes dental specimen (likely Otodus or Carcharias sp.)

Ferruginous Sandstone Concretion (Ironstone Phosphorite)

Ferruginous Sandstone (variable Fe-oxide/hydroxide composition)

Brachiopod Fossil in Matrix

Phylum Brachiopoda

Fossiliferous Limestone (Gastropod / Crinoid Fossil Rock)

Biogenic Sedimentary Rock (CaCO3)

Rounded quartz-rich sandstone cobble

Quartz arenite (sandstone), likely iron-stained