page_title: Acropolis of Athens
section_title: Geology
hierarchical_section_title: Acropolis of Athens / Geology
caption_attribution_description: English: The acropolis is so overgrown that it is impossible to a non-specialist to recognise constructions. This was one of the rare large walls, but of what?
context_page_description: The Acropolis of Athens is an ancient citadel located on a rocky outcrop above the city of Athens and contains the remains of several ancient buildings of great architectural and historic significance, the most famous being the Parthenon. The word acropolis is from the Greek words ἄκρον and πόλις. Although the term acropolis is generic and there are many other acropoleis in Greece, the significance of the Acropolis of Athens is such that it is commonly known as "The Acropolis" without qualification. During ancient times it was known also more properly as Cecropia, after the legendary serpent-man, Cecrops, the supposed first Athenian king.
  While there is evidence that the hill was inhabited as far back as the fourth millennium BC, it was Pericles in the fifth century BC who coordinated the construction of the site's most important present remains including the Parthenon, the Propylaea, the Erechtheion and the Temple of Athena Nike. The Parthenon and the other buildings were seriously damaged during the 1687 siege by the Venetians during the Morean War when gunpowder being stored in the Parthenon was hit by a cannonball and exploded.
context_section_description: The Acropolis is a klippe consisting of two lithostratigraphic units, the Athens schist and the overlying Acropolis limestone. The Athens schist is a soft reddish rock dating from the upper Cretaceous period. The original sediments were deposited in a river delta approximately 72 million years ago. The Acropolis limestone dates from the upper Jurassic period, predating the underlying Athens schist by about 30 million years. The Acropolis limestone was thrust over the Athens schist by compressional tectonic forces (Plate tectonics), forming a nappe or overthrust sheet. Erosion of the limestone nappe led to the eventual detachment of the Acropolis, forming the present day feature. Where the Athens schist and the limestone meet there are springs and karstic caves. Many of the hills in the Athens region were formed by the erosion of the same nappe as the Acropolis. These include the hills of Lykabettos, Areopagus, and Mouseion. The marble utilized to construct the buildings of the Acropolis was sourced from the quarries of Mount Pentelicus, a mountain to the northeast of the city.
caption: Potentially techtonically susceptible structure.
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