It is very difficult to photograph the Arches because they are so large.
- these are the larger, easily visible pieces, such as the larger grains of sand and the pebbles 2. Matrix - this is the smaller sediment around the pebbles 3. Cement - this is the substance that holds the matrix and clasts together, a type of mineral "glue", it can be silica, iron oxide, or calcite. Conglomerate rocks has clasts of rounded pebbles, breccia has clasts of broken, angular rocks.
This odd sandstone was also found at the base of Maudes Crack. Often the sandstone has veins of harder iron oxide "cement", the softer sandstone erodes around the veins leaving the protruding lines. Iron oxide is also called "rust".
