Dilek Peninsula-Büyük Menderes Delta National Park Aegean Region in general. The peninsula was shaped into its current form over several geological eras with the tectonic merging of Paleozoic schist formations, Mesozoic limestone and marble deposits, and finally the accretion of large clays and other sediments during the Neogene period. This is partly because of Turkey's unstable fault block terrain, and because of the close proximity of the Anatolian-Aegean plate boundary, which generates massifs of mountains all across western Turkey. This includes the peninsula and the mountains surrounding the Büyük Menderes River, known collectively as the Menderes Massif. The peninsula is highly mountainous, with most of its
Anatolian diagonal and land bridges intermittently formed across the Bosphorus and the Sea of Marmara. After the end of the most recent ice age, plants surviving to the west of the Anatolian diagonal could spread back into Europe while those to the east could spread into Syria, Iraq and the Near East. The Taurus Mountains provide a cool damp climate for species that cannot survive the hot dry summer climate on either side, and this could have encouraged survival and speciation, resulting in the many endemic species found here today. Anatolian diagonal The Anatolian diagonal is a theoretical dividing line which runs