What interested me more than the footprints in the above photos was the pattern of color in the sand. Black bands in a background of light tan sand.
Sand is caused a breakdown of organic and inorganic material — mostly rock. Much of the paler sand comes from a breakdown of coral and seashells, as well as the island’s limestone. I thought the black color shown in these photos was dirt washing in on a creek that emptied on the beach, but turns out it is black sand caused by the breakdown of lava rock on the island of Nusa Penida.
So it turns out to be two shades of sand on one beach — with ever shifting pattern caused by the waves. Rather cool!
