 Also known as the Paratethys, the new sea hosted rich fauna, including whales, sharks, manatees, mussels, seaweed and bladder wrack, and formed the Schoeneck Fish Shale, an important petroleum source rock.The basin silted up 17 million years ago and shifted to freshwater deposition, which were then worn away seven million years ago.Beginning 23 million years ago, the Adriatic Plate continued to approach the Eurasian Plate, resulting in crustal shortening and extended the orogenic eastward, creating the Styrian, Carpathian, Pannonian and Vienna basins.