Sedimentary Rock

Conglomerate Pebble (with Chert / Quartz)

Sedimentary Conglomerate / Breccia Pebble

Seashell (Calcium Carbonate)

Calcium Carbonate (CaCO3)

Fossil Coral

Tabulate Coral (potentially Favosites or Calapoecia)

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

Fossil shell fragment in sedimentary rock

Indeterminate marine mollusk shell; likely a bivalve or gastropod fossil

Devil's Toenail

Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)

Weathered Sedimentary Rock

Sedimentary Rock

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone (Sedimentary Rock)

Arenite (SiO2 based)

Banded Sedimentary Rock

Sedimentary rock with Liesegang banding

Banded Sedimentary Rock

Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands

Chert (Sedimentary Rock)

Silicon Dioxide (SiO2)

Sedimentary Rock Fragments

Clastic Sedimentary Rock

Weathered Sedimentary Rock with Liesegang Rings

Sandstone or Siltstone with Iron Oxide Banding

Shale with Quartz Vein

Argillaceous Shale with Silicon Dioxide Vein

Banded Sedimentary Rock

Sedimentary rock with Liesegang banding

Fossiliferous Sedimentary Rock

Sedimentary Rock with Invertebrate Fossil Imprint

Banded Sedimentary Rock

Sedimentary Rock with Quartz/Feldspar Vein

Banded Sedimentary Rock

Sedimentary rock with mineral veins/banding

Fossil in Shale

Fossiliferous Shale

Fossil bivalve or brachiopod in sedimentary rock

Unidentified fossil shell impression; likely a ribbed bivalve or brachiopod preserved in shale/siltstone

Banded Sedimentary Rock (Siltstone/Mudstone with concretion)

Siltstone with Ferruginous Banding

Quartzite Conglomerate

Conglomerate (SiO2 rich)

Pitted Sedimentary Rock / Cupstone

Sedimentary rock with weathering pit (arenite / sandstone)

Banded sedimentary rock (likely sandstone or siltstone)

Layered siliciclastic sedimentary rock; exact identification is not possible from the image alone

Quartz-veined Sedimentary Rock

Sedimentary rock with hydrothermal quartz veins

Fossil-bearing sedimentary rock (possible bone or shell fossil)

Unidentified fossiliferous sedimentary matrix; exact fossil and host rock cannot be determined from the image

Vein-filled Sedimentary Rock

Silicified sedimentary rock with quartz/calcite vein

Sedimentary Rock (Limestone or Siltstone pebble)

Sedimentary rock fragment

Mixed sedimentary rock and mineral specimens

Predominantly limestone, chert, sandstone, and iron-oxide-bearing clasts; exact identification requires testing

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (Goethite/Hematite shell with Sandstone core)

Fossiliferous Sedimentary Rock (Coquina/Limestone)

Fossiliferous Calcarenite / Bioclastic Limestone

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with marine fossils

Weathered stone pebble (exact rock type indeterminate)

Unidentified fine-grained rock; composition cannot be determined from the image

Fossil-bearing Sedimentary Rock

Sedimentum cum fossili

Chert Nodules in Sedimentary Rock

Microcrystalline Quartz (SiO2) within Clastic Matrix

Brachiopod Fossil in Sedimentary Rock

Phylum Brachiopoda fossil imprint in sedimentary matrix

Weathered sedimentary rock, possibly sandstone

Indeterminate clastic sediment; probable quartz-rich sandstone

Unidentified pale sedimentary rock, likely limestone

Calcite-rich limestone (CaCO₃), possibly fossiliferous or weathered micritic limestone

Common Pebble / Sedimentary Rock Fragment

Lithified clastic sediment

Fossiliferous Limestone (or Bryozoan/Coral Fossil Pebble)

Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)

Fossil-bearing sedimentary rock, possibly fossil wood or bone

Indeterminate silicified/carbonate fossil in sandstone or mudstone