SEDIMENTARY ROCK SPECIMEN
Rocks are simply defined as an aggregate of minerals. There three classifications Igneous Rocks formed from cooled lava and magma associated with volcanic activity. Sedimentary Rocks formed from compacting sediments (pebbles, sand and clay) often below sea level. Metamorphic Rocks forms from preexisting rocks that get buried and remain in a solid state while immersed at various levels of heat and pressure.
Detrital sediments result from the erosion and subsequent transportation of a pre-existing rock; chemiscal sediments form by primary precipitation in shallow marine environments; organic sediments form from biological activity.
Sedimentary Rocks: Clastic from detrital inorganic matteral
Varves (Sandstone and Shale)
Sedimentary Rocks: Chemical and Bio-Chemical from percipitation
Travertine (cut and polished)
Limestone (Calcite vein)
Limestone (with layers)
Gypsum and Limestone
Sedimentary Rocks: Organic from the remains of living things
Data: Pellant, Chris. Smithsonian Handbooks. Rocks and Minerals: The clearest recognition guide available. A Dorling Kindersley Book.