Sedimentary (Fossiliferous)

Coquina or Fossiliferous Conglomerate

Bioclastic Rudstone (variable composition)

Chert (and Fossiliferous Chert)

Silicon Dioxide (SiO2)

Fossiliferous conglomeratic sandstone

Clastic sedimentary rock, likely quartz–feldspar sandstone with lithic granules and shell/bioclastic fragments

Polished fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Weathered fossiliferous limestone

Calcitic limestone, predominantly calcite (CaCO₃), possibly bioclastic

Fossiliferous limestone pebble

Bioclastic limestone, chiefly calcite (CaCO₃)

Chert (or Fossiliferous Limestone)

Microcrystalline Quartz (SiO2) / Calcium Carbonate (CaCO3)

Flint / Chert (Fossiliferous)

Silicon dioxide (SiO2) with microcrystalline quartz

Weathered limestone cobble

Limestone, primarily calcite (CaCO₃), possibly fossiliferous or micritic

Polished fossiliferous agate

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

Weathered limestone or calcareous sandstone

Calcite-rich carbonate rock, likely limestone (CaCO₃)

Tumbled fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃)

Chalky limestone

Micritic calcite limestone; predominantly CaCO₃

Chalky limestone

Calcite-rich limestone; chiefly calcium carbonate (CaCO₃)

Coquina / Fossiliferous Limestone

Bioclastic Limestone (CaCO3)

Coquina (Fossiliferous Limestone)

Coquina (Organic Clastic Limestone)

Chert (Nodular or Fossiliferous)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Stromatolite (Fossiliferous Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Coquina / Fossiliferous Limestone

Coquina (composed primarily of Calcium Carbonate / CaCO3)

Coquina (Fossiliferous Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous Limestone (with Crinoids)

CaCO3 (Calcium Carbonate)

Weathered fossiliferous limestone, likely coral or shell fragment

Calcite (CaCO₃), biogenic limestone; exact fossil taxon indeterminate from the image

Mookaite Jasper

Radiolarite (Silica, SiO2)

Crinoid Fossil in Limestone

Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)

Weathered limestone pebble

Microcrystalline calcite (CaCO₃), possibly fossiliferous limestone

Weathered sandstone or siltstone cobble

Clastic sedimentary rock, likely quartz–feldspar lithic sandstone (exact identification requires testing)

Water-worn limestone and calcite-rich stones

Limestone, chiefly calcite (CaCO₃), with possible dolomite and minor iron-oxide staining

Weathered limestone or chert-rich limestone

Calcitic limestone, primarily calcium carbonate (CaCO₃), possibly with microcrystalline silica and iron-oxide staining

Weathered quartz-rich rock, likely chert or silicified limestone

Microcrystalline quartz (chalcedony, SiO₂), possibly with calcite (CaCO₃) and iron oxides

Weathered limestone

Calcite-rich carbonate rock, primarily CaCO₃

Rounded limestone pebble

Micritic limestone, primarily calcite (CaCO₃)

Weathered limestone or concrete-like calcareous rock

Limestone; predominantly calcite (CaCO₃), possibly containing dolomite and silicate impurities

Tumbled limestone pebble

Micritic limestone, chiefly calcium carbonate (CaCO₃; calcite)

Kaibab Limestone

Calcitic limestone, predominantly calcium carbonate (CaCO₃)

Likely weathered gray flint/chert pebble

Microcrystalline quartz (SiO₂), commonly with chalcedony and minor impurities

Weathered limestone

Calcitic limestone, mainly calcium carbonate (CaCO₃)

Weathered limestone pebble

Limestone, primarily calcite (CaCO₃)

Fossiliferous Limestone (Gastropod / Crinoid Fossil Rock)

Biogenic Sedimentary Rock (CaCO3)

Polished fossiliferous limestone pebble

Fossiliferous micritic limestone, chiefly calcite (CaCO₃)

Porous limestone (likely fossiliferous or reef limestone)

Calcite-rich carbonate rock; predominantly CaCO₃

Fossiliferous Limestone (Bivalve Fossil)

Calcium Carbonate (CaCO3) with Bivalvia fossil