Fouldrey itself is not assured of immortality, for there can be no doubt that much of the present sea in this part of Morecambe Bay covers, as at Norbreck, surface that aforetime was dry, and where fir-trees grew and hazel-nuts. Stagnant water had converted the ground into moss, even before the invasion of the sea; for peat is found by digging deep enough into the sands, with roots of trees and trunks that lie with their heads eastwards. Walney, Fouldrey, and the adjacent islets, were themselves probably formed by ancient inrush of the water. The beach hereabouts, as said by Camden, certainly "once lay out a great way westward into the ocean, which the sea ceased not to slash and mangle ... until it swallowed up the shore at some boisterous tide, and thereby made three huge bays." Sand and pebbles still perseveringly accumulate in various parts. Relentless in its rejection of the soft and perishable, these are the things which old ocean loves to amass. The castle was dismantled by its own builders at the commencement of the fifteenth century, probably because too expensive to maintain. From that time forwards it has been slowly breaking up, though gaining perhaps in pictorial interest; and seen, as it is, many miles across the water, never fails to excite the liveliest sentiments of curiosity. One of the abbots of Furness was probably the builder also of the curious old square tower still standing in the market-place of Dalton, and locally called the "Castle." The architecture is of the fourteenth century.