Sedimentary (Fossiliferous)

Fossiliferous Limestone (Coquina / Shell Bed)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Turritella Agate

Elimia tenera silicified fossiliferous chalcedony

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

Fossiliferous Limestone / Fossil Fragment

Calcium Carbonate (CaCO3) with indeterminate biogenic remains

Fossiliferous Shale or Slate with Plant Fossils

Fossil-bearing argillaceous rock

Fossil-bearing limestone

Bioclastic limestone, likely containing bivalve or brachiopod impressions

Crinoid Stem Fossil

Crinoid ossicle (phylum Echinodermata)

Fossilized shell or brachiopod

Likely a calcareous brachiopod or bivalve fossil; exact identification requires clearer detail and scale

Fossiliferous Limestone (Crinoid stem fragments)

Bioclast-bearing Carbonate Rock (Caco3)

Fossiliferous Limestone Pebble

Calcite-rich Fossiliferous Marine Limestone

Fossiliferous Jasper / Miriam Stone / Elephant Skin Jasper

Biogenic Chalcedony / Silicified Fossiliferous Limestone

Silicified fossil-bearing limestone (likely chert/agate replacement)

Microcrystalline quartz (SiO₂) replacing carbonate rock; possible fossiliferous limestone

Orthoceras Fossil in Limestone

Orthoceras (extinct genus of cephalopods), mineralized as Calcite (CaCO3) in Fossiliferous Limestone

Crinoid Stem Fossil

Crinoida (columnal ossicles)

Weathered limestone

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

Slate with Fossiliferous Impressions

Metamorphosed Argillaceous Rock (Fossiliferous Slate)

Granite (phaneritic background) with Limestone/Calcite carving

Felsic Igneous Plutonic Rock (background) / Calcium Carbonate (CaCO3) (carving)

Limestone (specifically fossiliferous/skeletal limestone)

Calcium Carbonate (CaCO3)

Fossilized oyster shell in limestone

Bivalvia fossil; chiefly calcite (CaCO₃)

Fossilized coral or carbonate fossil fragment

Calcareous fossil, likely colonial coral (order Hexacorallia; uncertain from image)

Rounded gray limestone pebble with a calcite vein

Calcitic limestone, composed predominantly of calcite (CaCO₃), locally cut by a white calcite vein

Weathered fossiliferous limestone

Calcite-rich limestone (CaCO₃), possibly containing fossil fragments or stylolites

Fossiliferous Chert Nodule

SiO2 (Microcrystalline Quartz) with fossil inclusions

Fossiliferous Limestone (with Rugose Coral)

Limestone with Tetracoralla (Rugosa) fossil

Turritella Agate / Fossiliferous Limestone

Elimia tenera in Chalcedony/Calcite Matrix

Turritella Agate / Fossiliferous Limestone

Elimia tenera (commonly mislabeled as Turritella in chalcedony/calcite matrix)

Fossilized Coral / Fossiliferous Limestone

Anthozoa fossil in Limestone (CaCO3)

Layered shale and sandstone gorge

Shale and thin-bedded sandstone, likely Devonian or older sedimentary strata

Chert

Siliceous sedimentary rock (predominantly microcrystalline quartz, SiO2)

Chert / Flint (Brecciated or Fossiliferous Limestone with Silicification)

Sedimentary cryptocrystalline quartz (SiO2)

Fossiliferous Limestone (Crinoid stem fragment)

Crinoidea (Phylum Echinodermata) in Calcite matrix

Fossiliferous limestone, likely coral or shell fragment

Calcitic limestone (primarily CaCO₃), containing preserved marine bioclasts

Fossiliferous limestone, possibly coral or stromatoporoid fossil

Calcitic limestone; predominantly CaCO₃, with fossilized colonial-organism structures

Fossiliferous Limestone / Petoskey Stone (Coral Fossil)

Hexagonaria percarinata / Calcite (CaCO3)

Calcite-rich limestone (possibly fossiliferous limestone)

Calcite, CaCO₃, in a limestone matrix

Chert or flint with chalcedony/quartz veins

Microcrystalline silica: primarily quartz (SiO₂), including chalcedony; possible fossiliferous limestone or silicified material

Shale (possibly)

Shale (fine-grained clastic sedimentary rock)

Crinoidal Limestone

Fossiliferous Limestone containing Crinoid stem fragments (Echinodermata)

Calligraphy Stone

Fossiliferous Stromatolite Limestone (also known as Arabic Script Stone, Miriam Stone, or Elephant Skin Jasper)

Weathered quartz-rich stone, possibly fossiliferous limestone

Indeterminate; likely calcite-rich limestone (CaCO₃) or weathered quartz-bearing rock