Sedimentary Rock Identification
Does the rock contain visible sediment particles?
No visible sediment particles.
Rock Color Description Rock Name Light color light pink, white or gray color, reacts with acid, may contain oceanic fossils, made up mostly of calcite from ocean water. Limestone light gray, tan or brown color, chalky feel, made up of silt (grain size between clay and sand). Siltstone Dark color black, usually shiny, smudges fingers, low density, made up of plant remains. Coal shades of gray or red, usually layered, breaks along flat surfaces, made of mud or clay. Shale/mudstone
- Visible sediment particles. Does the rock contain shells or pieces of shell?
Visible sediment particles with shells
Description Rock Name Light in color, made up almost entirely of shells or pieces of shell cemented together. Coquina
Visible sediment particles with no shells
Sediment Particle Size Description Rock Name Mixed - both large and small. multicolored, made up of large angular rock fragments cemented together. Breccia multicolored, made up of large rounded rock fragments cemented together with smaller sediments. Conglomerate Mostly the same size. maroon color, made up mostly of sand-size particles with some pebbles cemented together, particles are mostly quartz and orthoclase. Arkose light color (usually white to tan), made up of sand-size particles cemented together, particles are mostly quartz. Sandstone