Sedimentary (Anthropogenic)

Fossiliferous Sedimentary Rock (Coquina/Limestone)

Fossiliferous Calcarenite / Bioclastic Limestone

Red Sandstone

Arenite (Ferruginous Sandstone)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Rounded sedimentary pebble

Likely micritic limestone or calcareous sandstone

Sandstone (Sedimentary Rock)

Arenite (SiO2 based)

Chalk (Sedimentary Limestone)

Calcite (CaCO3)

Banded Sedimentary Rock

Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands

Weathered Sedimentary Rock with Liesegang Rings

Sandstone or Siltstone with Iron Oxide Banding

Banded chert or siliceous sedimentary rock

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide staining and possible carbonate/clay layers

Polished sedimentary pebble, likely sandstone or quartzite

Quartz-rich sandstone (SiO₂-dominant), possibly weakly metamorphosed quartzite

Weathered sedimentary cobble, likely limestone or calcareous sandstone

Indeterminate carbonate-rich clastic rock; possibly micritic limestone or calcarenite

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

Banded chert or silicified sedimentary rock

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral bands

Common Pebble / Sedimentary Rock Fragment

Lithified clastic sediment

Weathered sandstone pebble

Quartz-rich sandstone, commonly arkose or lithic sandstone

Pyrite Nodules / Weathered Pyrite

Iron Sulfide (FeS2)

Sandstone and River Pebbles

Sedimentary Rock (Sandstone / Quartzite / Chert)

Sandstone

Quartz Sandstone (predominantly)

Shale creek bed

Shale (fine-grained clastic sedimentary rock)

Likely blue-gray slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Limestone

Calcium Carbonate (CaCO3)

Small quartz-rich mineral fragment

Quartz (SiO₂), possibly milky or chalcedonic quartz

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Quartz-veined Sedimentary Rock

Sedimentary rock with hydrothermal quartz veins

Banded gneiss (likely biotite-bearing)

Gneiss; quartz–feldspar–mica assemblage, with possible iron-oxide staining

Banded gneiss (likely garnet-biotite or quartz-feldspar gneiss)

Gneiss; predominantly quartz (SiO₂), feldspar, and dark biotite/amphibole

Banded Iron Formation

Banded Iron Formation (BIF)

Felsic gneiss, likely granitic gneiss

Quartz–feldspar–mica gneiss; commonly quartz + plagioclase/K-feldspar + biotite or hornblende

Granite

Felsic intrusive igneous rock

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Iron Oxide cement)

Sandstone (with minor weathering/pitting)

Clastic Sedimentary Rock (composed mostly of SiO2)

Fossiliferous Limestone

Bioclastic Limestone (CaCO3)

Sandstone

Sandstone (SiO2 predominant)

Red Sandstone

Sandstone (principally Quartz, SiO2, with Iron Oxide hematite cement)

Fossiliferous Limestone with Brachiopods

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

Brachiopod Fossil in Sedimentary Rock

Phylum Brachiopoda fossil imprint in sedimentary matrix

Limonite (Iron Stone Concretion)

Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O

Bivalve Fossil (Shell-bearing Sedimentary Rock)

Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix

Dendritic sandstone

Sandstone with Manganese Oxide dendrites

Hag Stone

Siltstone or Fine-grained Sandstone with boring (e.g., Lithophaga impact)