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The marls must have been formed largely by the driftage of sand and clay, while some of the limestone was6 produced by accumulation of corals and shells.

And now both their minds were Londonward, where all the tides and driftage and currents of human thought still meet and swirl together.

Experience has given directions for its use, avoiding some of the grosser causes of error from driftage and other causes.

The catastrophe of the Great War did more or less completely awaken a certain limited number of intelligent people to the need of some general control replacing this ancient traditional driftage of events.

Among caves of driftage may be classed some of those near Liège, in Belgium, and, partially at least, those of Kent's Hole and Brixham, in England.