Megalith

A megalith is a large stone that has been used to construct a prehistoric structure or monument, either alone or together with other stones. More than 35,000 megalithic structures have been identified across Europe, ranging geographically from Sweden in the north to the Mediterranean Sea in the south.

The word was first used in 1849 by the British antiquarian Algernon Herbert in reference to Stonehenge and derives from Ancient Greek μέγας (mégas), meaning "great", and λίθος (líthos), meaning "stone". Most extant megaliths were erected between the Neolithic period (although earlier Mesolithic examples are known) through the Chalcolithic period and into the Bronze Age.

While "megalith" is often used to describe a single piece of stone, it also can be used to denote one or more rocks hewn in definite shapes for special purposes. It has been used to describe structures built by people from many parts of the world living in many different periods.^{[citation needed]} The most widely known megaliths are not tombs.

The most common type of megalithic construction in Europe is the portal tomb—a chamber consisting of upright stones (orthostats) with one or more large flat capstones forming a roof. Many portal tombs have been found to contain human remains, but it is debated if their primary function was use as burial sites. The megalithic structures in the northwest of France are believed to be the oldest in Europe based on radiocarbon dating. Though generally known as "dolmens", the term most accepted by archaeologists is "portal tomb". Local names for portal tombs exist in multiple locations, such as anta in Galicia and Portugal, stazzone in Sardinia, hunebed in the Netherlands, Hünengrab in Germany, dysse in Denmark, and cromlech in Wales. It is assumed that most portal tombs were originally covered by earthen mounds.

The second-most-common tomb type is the passage grave. It normally consists of a square, circular, or cruciform chamber with a slabbed or corbelled roof, accessed by a long, straight passageway, with the whole structure covered by a circular mound of earth. Sometimes it is also surrounded by an external stone kerb. Prominent examples include the sites of Brú na Bóinne and Carrowmore in Ireland, Maes Howe in Orkney, and Gavrinis in France.

The third tomb type is a diverse group known as gallery graves. These are axially arranged chambers placed under elongated mounds. The Irish court tombs, British long barrows, and German Steinkisten belong to this group.

Standing stones, or menhirs as they are known in France, are very common throughout Europe, where some 50,000 examples have been noted.^{[citation needed]} Some of these are thought to have an astronomical function as a marker or foresight.^{[citation needed]} In some areas, long and complex "alignments" of such stones exist, the largest known example being located at Carnac in Brittany, France.^{[citation needed]}

In parts of Britain and Ireland a relatively common type of megalithic construction is the stone circle, of which examples include Stonehenge, Avebury, Ring of Brodgar and Beltany. These, too, display evidence of astronomical alignments, both solar and lunar. Stonehenge, for example, is famous for its solstice alignment. Examples of stone circles are also found in the rest of Europe. The circle at Lough Gur, near Limerick in Ireland has been dated to the Beaker period, approximately contemporaneous with Stonehenge. The stone circles are assumed to be of later date than the tombs, straddling the Neolithic and the Bronze Ages.