"At the extremity of the parish of Burnsal, the valley of Wharf forks off into two great branches, one of which retains the name of Wharfdale, to the source of the river; the other is usually called Littondale, but more anciently and properly, Amerdale. Dernbrook, which runs along an obscure valley from the N.W., is derived from a Teutonic word, signifying concealment."--DR. WHITAKER.