Sedimentary Rock

Fossil-bearing fine-grained sedimentary rock

Likely fossiliferous mudstone or shale; visible feature may be a plant fragment, trace fossil, or mineral vein

Weathered sandstone or quartz-rich sedimentary rock

Likely quartz arenite/subarkose; predominantly quartz (SiO₂) with feldspar and iron-oxide cement

Sandstone

Arenite

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Fossilized Shell Fragment

Invertebrate marine fossil, likely calcium carbonate replacement

Weathered sandstone or iron-stained sedimentary rock

Likely quartz-rich sandstone (SiO₂) with iron-oxide staining; exact identification requires testing

Iron-stained chert or siliceous sedimentary rock

Microcrystalline quartz (SiO₂), likely chert with iron-oxide staining

Sandstone

Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)

Fossil Shell

Phylum Mollusca (Bivalvia or Brachiopoda)

Fossilized Bivalve Shell

Class Bivalvia (fossilized)

Fossil Shark Tooth

Selachii (fossilized dentition)

Conglomerate

Conglomerate

Weathered sandstone or iron-rich sedimentary rock

Clastic sandstone, likely ferruginous sandstone; primarily quartz (SiO₂) with iron-oxide cement

Sandstone (Pebble)

Arenite

Sandstone or similar clastic rock

Arenite

Veined Quartzite / Vein-filled Sedimentary Rock

Siliciclastic rock with iron oxide-filled fractures

Weathered sandstone or iron-stained sedimentary rock

Quartz-rich sandstone, likely ferruginous sandstone (SiO₂-dominated)

Weathered sandstone or iron-rich sedimentary rock

Indeterminate siliciclastic sandstone, possibly ferruginous sandstone

Weathered sandstone or iron-rich sedimentary rock

Sandstone, likely quartz-rich with iron-oxide staining

Weathered sandstone or iron-rich sedimentary rock

Clastic sandstone, likely ferruginous sandstone (quartz-rich; exact identification uncertain from image)

Weathered sandstone or fine-grained sedimentary rock

Quartz-rich sandstone, possibly arkose or lithic sandstone

Weathered sandstone or iron-stained sedimentary rock

Quartz-rich sandstone, likely ferruginous sandstone

Weathered sandstone or iron-stained sedimentary rock

Likely quartz-rich sandstone; exact identification is uncertain from the photograph

Weathered sandstone or iron-stained sedimentary rock

Quartz-rich sandstone, likely limonitic/goethitic cement

Shale / Mudstone

Sedimentary rock (Claystone / Mudstone / Shale)

Weathered sandstone or iron-rich sedimentary rock

Indeterminate siliciclastic rock; likely quartz-rich sandstone with iron-oxide staining

Weathered sandstone or iron-rich sedimentary rock

Quartz-rich arenite, possibly ferruginous sandstone

Fossiliferous Limestone containing a Brachiopod or Mollusk Impression

Biogenic Sedimentary Rock / Fossiliferous Limestone

Conglomerate

Pebble Conglomerate / Clastic Sedimentary Rock

Painted River Rock

Anthropogenic-modified Siliciclastic Sedimentary Rock

Jasper Conglomerate (Puddingstone)

Jasper Conglomerate (Siliceous Sedimentary Rock)

Jasper Conglomerate (specifically Puddingstone)

Jasper Conglomerate (Siliceous sedimentary rock)

Quartz Conglomerate

Quartz Conglomerate (clastic sedimentary rock)

Ferruginous Conglomerate

Ferruginous Conglomerate (Clastic Sedimentary Rock)

Weathered sandstone or iron-stained sedimentary rock

Quartz-rich sandstone, likely ferruginous sandstone (SiO₂ with iron-oxide cement)

Sandstone Pebble

Sedimentary quartz arenite

Weathered sandstone or iron-stained sedimentary rock

Quartz-rich clastic sandstone; exact identification requires testing

Quartz Geode (likely within Limestone or Dolomite matrix)

Quartz (SiO₂)

Quartz Pebble

Silicon dioxide (SiO2)

Chert

Silicon dioxide (SiO2)

Purple Chalcedony

Silicon Dioxide (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)