These beds of sandstone are really wide stretches of the sandy shores of an ancient sea, which have been pressed into a solid substance by the weight of other layers of rock deposited over them in later ages. Thus they belong to a group of what are called 'water-laid' rocks. We know that seas once flowed over them because some of the beds show the ripple-marks that we see so often in the sands when walking by the sea-shore. A fearful looking monster, with the equally terrible name of labyrinthodont, in appearance rather like a gigantic frog, has left his 'footprints in the sands' in the rocks near Lymm and Weston. You will probably not be able to find these footprints, but in the museums at Manchester and Warrington you may see them on large slabs of sandstone rock. How would you like to meet one of these reptiles to-day, wallowing in the mud on the shores of some Cheshire mere? On the same slabs you will see suncracks which tell us of the baking of sand and mud in the sun's rays when the tide has gone down. The lower layers of the New Red Sandstone are of a paler colour, light brown or almost white. To these the name of 'Bunter' has been given to distinguish them from the upper and therefore later deposits known as 'Keuper' sandstone. The Bunter beds are found chiefly in the west of the county, and in Wirral, where you may see the Keuper rocks of Storeton Hill sticking up above the layers of Bunter stone that surround and underlie them. The greater part of the surface of Cheshire consists of these rocks. Alderley Edge and Helsby Hill, the hills of Delamere and Peckforton are composed of it, and it crops out often in our village streets. The steps of the village cross at Lymm are cut out of a piece of rock which sticks out in the middle of the road. In the sandstone beds at Northwich, Winsford, and Middlewich are layers of rock salt from which we obtain our salt for food and other domestic uses. The salt was formed at a time when the sea was gradually disappearing from the surface of Cheshire leaving inland salt lakes, which, becoming dried up, deposited beds of salt crystals. These, like the sandstone, became pressed into a solid condition by the weight of other layers. Where the salt has been taken out of the earth the upper layers have sunk from time to time. At Northwich the land is continually sinking, and you may see houses and chimneys cracked and twisted out of their proper shape as if they had been visited by an earthquake. Often the hollows where the land has sunk have become filled with water and produced the numerous meres or small lakes dotted about the county. In the valley of the Weaver they are locally known as 'flashes'. [Illustration: STRIATED BOULDER (ERRATIC): HIGH LEGH]