The Screw

This pillar is found in Torcal de Antequera Natural Park, Málaga province, southeastern Spain. This is one of many impressive erosional features in the Natural Park set around the Torcal Mountains.

The rocks are Jurassic aged limestones, deposited along the edge of the Tethys seaway. Most of the limestone is high quality and oolitic – made of small, rounded pieces of limestone that formed in a shallow sea, far from land but still able to be moved around by passing waves. The rocks were later gently folded and thrust up to the surface as the Iberian Peninsula rotated and Africa began to impinge on Europe.

Once they were exposed, the layers began eroding in the typical karst fashion – limestones react with water anywhere it seeps in, dissolving the rock and taking it away. Both vertical fractures and bedding layers in these rocks served as conduits for water, leaving behind towers like this carved vertically and horizontally.

Although the area is a nature park today, in historic times these rocks were quarried as high-grade building and carving stone, including during the time of the Roman Empire. The white limestones at this site are considered to rival marble for carving stone in those times. Source EarthStory

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