Sedimentary (Fossiliferous)

Rounded chert or silicified limestone pebble

Microcrystalline quartz (SiO₂), possibly fossiliferous or iron-stained carbonate host

Weathered fossiliferous limestone

Calcitic limestone; predominantly CaCO₃, possibly containing a fossil mold or shell fragment

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Fossilized Shark Tooth

Fossilized Elasmobranchii tooth (likely Odontaspis or Carcharias)

Fossiliferous Limestone or Mudstone

Sedimentary Rock with Invertebrate Fossils

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 + varied clasts)

Agate with Fossil/Inclusion

Silicon Dioxide (SiO2) with chalcedony and potential fossil inclusion

Fossilized Brachiopod/Bivalve in Limestone

Brachiopoda or Bivalvia fossil in Calcite/Limestone (CaCO3)

Tumbled fossiliferous limestone

Fossiliferous micritic limestone, mainly calcite (CaCO₃)

Polished fossiliferous limestone, likely crinoidal or coral limestone

Calcite (CaCO₃), fossiliferous carbonate rock

Polished fossiliferous limestone

Bioclastic limestone, commonly crinoidal limestone (calcite, CaCO₃)

Coquina or Fossiliferous Sandstone

Fossiliferous Calcarenite (CaCO3 with SiO2 inclusions)

Coquina / Fossiliferous Limestone

Fossiliferous Calcarenite (Calcium carbonate, CaCO3)

Fossiliferous Limestone (with Oyster Fossils)

Fossiliferous Calcarenite / Bivalve Mollusk Fossil

Bumblebee Jasper

Fossiliferous Calcite containing Orpiment and Realgar

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous limestone pebble

Bioclastic limestone, likely containing small gastropod or bivalve fossils (primarily calcite, CaCO₃)

Bay Scallop Shell

Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)

Weathered limestone fragment

Limestone, predominantly calcite (CaCO₃)

Fossiliferous limestone pebble

Bioclastic limestone, primarily calcite (CaCO₃)

Porous limestone

Calcareous limestone, primarily calcite (CaCO₃)

Polished fossiliferous limestone, possibly ammonite-bearing

Calcite-rich limestone (CaCO₃), with visible fossil or shell fragments

Mixed pebble collection, including likely flint, quartzite, and fossil material

Varied silicate rocks; visible specimen may include chert (microcrystalline SiO₂), quartzite, and a possible fossil

Fossiliferous Limestone with Brachiopod

Phylum Brachiopoda in calcitic matrix

Chert (and Fossiliferous Limestone)

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Tumbled limestone pebble

Micritic limestone, chiefly calcite (CaCO₃)

Sandstone

Arenite (SiO2 primarily)

Limestone

Limestone (Calcium Carbonate - CaCO3)

Sandstone

Arenite (typically SiO2 + others)

Limestone Breccia

Sedimentary Breccia (Calcareous)

Weathered limestone fragment

Limestone, predominantly calcite (CaCO₃)

Fossiliferous limestone pebble

Bioclastic limestone, chiefly calcite (CaCO₃), possibly containing small fossil fragments

Limestone with Quartz/Calcite Veins

Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)

Weathered limestone

Limestone, predominantly calcite (CaCO₃)

Fossiliferous Limestone with Brachiopods

Calcium Carbonate (CaCO3) with fossilized Brachiopoda sp. (likely Order Spiriferida or Rhynchonellida)

Weathered limestone

Micritic to fossiliferous limestone; primarily calcite (CaCO₃)

Fossiliferous shale or mudstone with a brachiopod fossil

Likely a spiriferid brachiopod fossil in dark shale/mudstone; exact species and age require locality and examination

Fossiliferous Limestone / Coral Fossil

Fossiliferous Limestone with Anthozoa (Coral) fossil