A must see located in the Andes, the Cerro de los Siete Colores (The Hill of Seven Colors) is one of the hills bordering the small town of Purmamarca (Province of Jujuy, Northwestern Argentina).
Sprung up around 75 million years ago, the hill was formed by a complex geological process that involved deposition of sea, lake and river movements and subsequent elevation of the land due to the movement of the tectonic plates.
This breathtaking sight is composed of 7 different colours, all of which derive from different types of rocks; leading to its diverse range of colours. Each colour/rock is also said to have formed during different time periods. Firstly, pink is believed to be composed of red clay, mudstone (mud) and arilitas (sand). Its estimated age goes back about 3 to 4 million years. The shade of white surrounding the pink is mostly made up of limestone and is aged about 400 million years. Continuing onto the mix of brown and purples, which are composed of lead, and rich in calcium carbonate, and is 80 to 90 million years of age. On top of the purple-brown colour, there is an earthy brown colour that has been detected in the rock. The rocks making up this colour are the most recent colours appearing on the rocks, aging at 1 to 2 million years old, and is described as ‘fanglomerate composed of rock with manganese belonging to Quaternary.’ As for the red, which is composed of claystones (iron) and other clays belonging to the upper Tertiary, its said to also be aged around 3 to 4 millions years. The shades of green, aging at about 600 million years, are made up of phyllites, and slates of copper oxide. Finally, the yellow mustard colour is made of sandstones with sulfur, and is estimated at 80 to 90 million years (Info source: Wikipedia)