Stand on the very highest point of the white limestone cliffs that stretch northwards from Flamborough Head, and realise that you are standing on what was once the bed of the sea. Strange though this be, it is nevertheless true. Countless ages ago what now towers up 450 feet above sea-level had over it the ceaseless rolling of the waters of the ocean, and during countless ages it was slowly formed out of the shells and teeth and bones of the creatures that lived in these waters. Men who know tell us that the layer of chalk at the bottom of the ocean to-day is composed principally of the remains of creatures so minute as to be visible only by the aid of a microscope, and that this layer grows in thickness at the rate of not more than one-tenth of an inch per year. They tell us also that the layer of chalk which extends under our county is not less than 1200 feet in thickness, and thus a simple calculation will help us to form some idea of the extent of time necessary for its formation. But however long this time actually was, it came to an end with a tremendous upheaval of a portion of the ocean bed, and the formation of a new area of ‘dry land.’ All the coast line of the East Riding, however, does not consist of chalk cliffs. North of Bempton and Speeton lie cliffs of sandstone and clay, which have yielded the fossil remains of living beings that once inhabited the water and the shore. Such are the belemnites and ammonites—the ‘thunderbolts’ and ‘St. Hilda’s snakes’ we may have heard them called—and the _Ichthyosaurus_, whose skeleton was recently discovered embedded in the clay cliffs at Speeton and may now be seen in the Hull Museum. Not a very handsome gentleman in the flesh he must have been, unless appearances are deceptive. [Illustration: ONE OF THE FIRST INHABITANTS OF THE EAST RIDING. Actual length about twelve feet. ] Again, walk southwards from Flamborough Head, and the chalk cliffs are found to get less and less in height until they disappear altogether, and their place is taken by cliffs of clay. Then these disappear, and are succeeded by the long, flat bank of sand and shingle which is known as Spurn Point; and if we round this point and follow the river bank, we find it nothing but mud and clay until we get past the mouth of the river Hull. At Hessle the chalk cliffs break out once more, and we know, from investigations, that the bed of chalk comes to the surface completely westwards of a line drawn from Flamborough to this point.