Margate was recorded as "Meregate" in 1264 and as "Margate" in 1299, but the spelling continued to vary into modern times. The name is thought to refer to a pool gate or gap in a cliff where pools of water are found, often allowing swimmers to jump in. The cliffs of the Isle of Thanet are composed of chalk, a fossil-bearing rock.The town's history is tied closely to the sea and it has a proud maritime tradition. Margate was a "limb" of Dover in the ancient confederation of the Cinque ports. It was added to the confederation in the 15th century. Margate has been a leading seaside resort for at least 250 years. Like its neighbour Ramsgate, it has been a traditional holiday destination for Londoners drawn to its sandy beaches. Margate had a fine Victorian era pier which was destroyed by a violent storm in 1978.