12-15 thousand years ago, the glacier that stood on the Lithuanian coast retreated and formed a moraine ridge. Its highest peak is called the Dutch Cap Cliff. This is a 24 m high moraine ridge rising above the sea. The Dutch Cap Cliff is constantly being eroded by waves and descends to the seashore with a 16-18 m high slope. There is no other high scarp seashore on the Lithuanian coast. The Dutch Cap Cliff, eroded by groundwater, is crumbling at a speed of 50 cm per year. There are three known cases when people found 23 thousand year old mammoth bones washed out of the cliff, two of which are stored in the Seaside Regional Park Visitor Center.