Sedimentary (Fossiliferous)

Fossiliferous limestone, possibly containing a brachiopod or bivalve fossil

Calcite-rich limestone (CaCO₃), with an apparent shell impression or shell fragment

Sandstone (likely Fossiliferous Sandstone)

Clastic sedimentary rock (primarily SiO2)

Fossiliferous limestone pebble

Bioclastic limestone, likely containing worn marine fossils (possibly gastropods or bivalves)

Fossiliferous limestone, likely stromatolitic or bioclastic limestone

Calcite-rich carbonate rock; predominantly CaCO₃ (calcite), with possible siliciclastic impurities and fossil structures

Weathered brown rock, likely sandstone

Quartz-rich sandstone (composition uncertain from image)

Fossiliferous Limestone with Crinoid Stem Impression

Calcium Carbonate (CaCO3) matrix with Crinoidea fossil

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Fossiliferous Limestone (Chertified Limestone)

Calcium Carbonate (CaCO3) often replaced by Microcrystalline Silica (SiO2)

Weathered limestone or calcareous sandstone

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

Fossiliferous limestone, possibly a shell or bone fragment

Calcitic limestone; predominantly calcium carbonate (CaCO₃), likely calcite

Fossiliferous limestone (probable crinoidal limestone)

Calcite-rich carbonate rock; chiefly CaCO₃, with fossil crinoid fragments

Fossiliferous limestone (reef or shell-rich limestone)

Bioclastic calcarenite/calcirudite; predominantly calcite (CaCO₃)

Fossiliferous limestone with shell fragments

Bioclastic calcarenite; predominantly calcite (CaCO₃), with fossil mollusk material

Conglomerate (possibly fossiliferous limestone breccia)

Polymictic conglomerate; clasts commonly quartz, chert, and carbonate cement (exact identification requires testing)

Fossiliferous limestone (likely crinoidal or shell-bearing limestone)

Calcite-rich carbonate rock; predominantly CaCO₃ (calcite), with possible bioclasts and minor dolomite/clay

Fossiliferous limestone, likely coralline or stromatolitic

Biogenic limestone; predominantly calcite (CaCO₃)

Fossiliferous limestone (likely ammonite/gastropod-bearing)

Bioclastic limestone; predominantly calcite (CaCO₃)

Fossiliferous Flint or Chert with Bryozoan Fossils

Sedimentary cryptocrystalline quartz (SiO2) with fossil inclusions

Rounded limestone pebble

Limestone; predominantly calcite (CaCO₃), possibly micritic or fossiliferous

Weathered sandstone fragment

Quartz-rich sandstone (compositionally uncertain)

Fossiliferous Sandstone (with Brachiopod or Bivalve mold)

Clastic Sedimentary Rock with Macrofossil Mold

Limestone

Calcium Carbonate (CaCO3)

Fossiliferous limestone, possibly coral-bearing

Calcitic limestone (mostly CaCO₃; fossil fragments may include ancient colonial coral or shell material)

Fossiliferous limestone slab

Bioclastic limestone, chiefly calcite (CaCO₃), with possible shell or coral fragments

Fossiliferous limestone, possibly an oyster or other bivalve fossil

Calcite (CaCO₃) shell material preserved in micritic limestone; exact fossil taxon cannot be confirmed from one image

Weathered sandstone or altered volcanic rock

Indeterminate; likely quartz–feldspar-rich sandstone, possibly tuff

Limestone (probable fossiliferous limestone)

Calcite-rich carbonate rock; predominantly CaCO₃ (calcite)

Chert or silicified limestone (uncertain)

Microcrystalline quartz (SiO₂), possibly calcitic limestone (CaCO₃)

Weathered limestone

Calcite-rich limestone (CaCO₃), possibly fossiliferous

Sandstone (Water-worn Pebble)

Clastic Sedimentary Rock (primarily SiO2)

Likely calcite-rich limestone

Calcite (CaCO₃), probably micritic or fossiliferous limestone

Weathered limestone

Limestone, predominantly calcite (CaCO₃), possibly fossiliferous

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)

Red Jasper with Fossils

Silicified Fossiliferous Jasper (Chert variant, SiO2)

Fossiliferous Sandstone Pebble (with Crinoid / Shell Impression)

Sandstone containing fossiliferous inclusions (SiO2 matrix with calcite/silica cast fossil)

Fossiliferous Limestone with Brachiopod Mold

Calcium Carbonate (CaCO3) matrix containing Brachiopoda fossil impressions

Fossiliferous Limestone with Rugose Coral

Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil

Fossiliferous Limestone with Rugose Coral

Lithostrotionella (Limestone Matrix - CaCO3)

Fossiliferous Limestone with Rugose Coral

Rugosa (order), typically preserved in CaCO3 (Calcite)

Fossiliferous Limestone with Crinoid Stem

Bioclastic Limestone (CaCO3)

Fossiliferous Limestone (Crinoidal Limestone)

Bioclastic grainstone (CaCO3)