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© Jan Miracky / AWL images
Nummulitic limestone. Polarised light micrograph of a thin section of a Nummulitic limestone. The large coloured objects are the remains of large foraminifera, Nummulites sp. These are embedded in a fine-grained matrix of calcareous remains of smaller, planktonic organisms. This type of rock is found in South Europe and North Africa, and was deposited during the eocene and oligocene epochs, 37-54 million years BP (before present). Magnification x10 at 6x7cm size. Magnification: x17 at 5x4 inch size.
© Alfred Pasieka/Science Photo Library
Large Size Panoramic View Of Matera, Third Oldest City In The World And UNESCO World Heritage Site
Large size panoramic view of the three different ages of Matera, considered the third oldest city in the world after Jericho and Aleppo, being inhabited continuously from the stone age to nowadays. World Heritage Site by UNESCO since 1993. The modern city has been built on top of the canyon (Gravina di Matera), over the famous Sassi di Matera, rock dwellings inhabited until the fifties of the twentieth century. The opposite side of the canyon has numerous prehistoric cave dwellings carved into the soft tufa stone. In this image the three different kind of dwellings are all visible.
© Federica Grassi