5. Conglomerate Rocks

Conglomerate: composed of large rounded fragments embedded in a fine-grained material (easily eroded because it is made up of tiny particles and layers).

  • Sandstone: composed mainly of sand-sized particles, and these are mainly of quartz.
  • Arkose: composed mainly of sand-sized particles of quartz and feldspar, the latter making up more than 25% of the total.
  • Shale: composed of fine particles predominantly of clay size.
  • Limestone: composed of calcite either (1) chemically precipitated in water, or (2) accumulated through the collection of organic remains such as shells, or (3) the result of building up of organic rock through the action of organisms like corals.

Take a look at the image below. See if you can make out different types, sizes, and forms of rocks that make up this conglomerate.