 Vessels have dragged up remains of mammoths, lions and other animals, and a few prehistoric tools and weapons.Doggerland was named in the 1990s, after the Dogger Bank, which in turn was named after the 17th century Dutch fishing boats called "doggers".Until the middle Pleistocene, Britain was a peninsula of Europe, connected by the massive chalk Weald–Artois Anticline across the Straits of Dover.