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surmounted by a menhir. In Brittany always, and probably generally, if not always, elsewhere, the dolmen was covered with a mound of earth or small stones. Those dolmens which stand exposed have probably had the earth removed by natural or artificial agencies. In Brittany many of the dolmens show no trace of mounds, standing bare upon the surface of the ground; but it is known that the soil has been removed by the peasants to spread upon their fields, the soil in this part of France being scanty, and the mounds furnishing an available supply. Many of the dolmens and covered passages are still partly underground, the whole of the tumuli not having been removed.

The menhirs vary greatly in size, from a small stone, not over two feet high, to larger ones many times that dimension, and weighing many tons. The greatest of all menhirs is the 'Great Stone' or 'Grand Menhir' at Locmariaquer, in Brittany. It is no longer standing, and is broken into several pieces, but was 70 feet high and weighed 300 tons.

The lechs are considered to be comparatively recent, for all these stone monuments, even in the same region, do not belong to the same period, some dating as far back as the stone age, while others can claim no greater antiquity than the age of bronze or even than a still later time.

The dolmen may be a simple chamber or a number of connecting chambers, and may open directly or may be preceded by a gallery or covered passage of varying length, but it is always open at one end.