The Locmariaquer megaliths are a complex of Neolithic constructions in Locmariaquer

Locmariaquer

Locmariaquer is a commune in the Morbihan department in Brittany in north-western France.It lies south of Auray by road.-Coat of arms:This coat of arms was created 30 years ago by the local artist Jean-Baptiste Corlobé...

, Brittany

Brittany

Brittany is a cultural and administrative region in the north-west of France. Previously a kingdom and then a duchy, Brittany was united to the Kingdom of France in 1532 as a province. Brittany has also been referred to as Less, Lesser or Little Britain...

. They comprise the elaborate Er-Grah tumulus passage grave

Passage grave

thumb|250px|right|A simple passage tomb in [[Carrowmore]] near [[Sligo]] in IrelandA passage grave or passage tomb consists of a narrow passage made of large stones and one or multiple burial chambers covered in earth or stone. Megaliths are usually used in the construction of passage tombs, which...

, a dolmen

Dolmen

A dolmen—also known as a portal tomb, portal grave, dolmain , cromlech , anta , Hünengrab/Hünenbett , Adamra , Ispun , Hunebed , dös , goindol or quoit—is a type of single-chamber megalithic tomb, usually consisting of...

 known as the "Table des Marchand" (Merchant's Table) and "The Broken Menhir of Er Grah", the largest known single block of stone to have been transported and erected by Neolithic

Neolithic

The Neolithic Age, Era, or Period, or New Stone Age, was a period in the development of human technology, beginning about 9500 BC in some parts of the Middle East, and later in other parts of the world. It is traditionally considered as the last part of the Stone Age...

 man.

The Broken Menhir of Er Grah

The broken menhir was erected around 4700 BC, at the same time as another 18 blocks nearby, it is thought to have been broken around 4000 BC. Measuring 20.6 metres (67.6 ft), with a weight of 280 tonnes, the stone is from a rocky outcrop located several kilometres away from Locmariaquer. The impressive dimensions of this menhir

Menhir

A menhir is a large upright standing stone. Menhirs may be found singly as monoliths, or as part of a group of similar stones. Their size can vary considerably; but their shape is generally uneven and squared, often tapering towards the top...

 still divide specialists about the techniques used for transport and erection, but the fact that this was achieved during the Neolithic era remains remarkable.

Worked over its entire surface, the monument bears a sculpture representing a "hatchet-plough". Unfortunately today this is seriously eroded and very difficult to see.

Destruction

It is not known what caused the menhir to topple and break into the four pieces that are now seen. At one time it was believed that the stone had never stood upright, but archaeological findings have proven that it did. The most popular theory is that the stone was deliberately pulled down and broken. Certainly other menhirs that accompanied it were removed and reused in the construction of tombs and dolmens nearby. However, in recent years, some archaeologists have favoured the explanation of an earthquake

Earthquake

An earthquake is the result of a sudden release of energy in the Earth's crust that creates seismic waves. The seismicity, seismism or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time...

 or tremor, and this theory is supported by a computer model.

Table des Marchand

The Table des Marchand is a large dolmen containing a number of decorations. The main capstone of the chamber includes a large carving on its underside depicting an axe, and part of an carved depiction of a plough, apparently pulled by oxen. This fragment indicates that the capstone was originally part of the broken menhir, since the design matches up with carvings on the broken remains across the breaks. Other parts were used in the tumulus and in the nearby dolmen of Gavrinis

Gavrinis

Gavrinis is a small island, situated in the Gulf of Morbihan in Brittany, France. It contains the Gavrinis tomb, a megalithic monument notable for its abundance of megalithic art in the European Neolithic. Administratively, it is part of the commune of Larmor-Baden.-Geography:Reachable by boat...

, on a nearby island. The stone at the back of the chamber contained an engraved stele with whorls and arched decorations which may represent fields of crops.

The dolmen was fully exposed and above ground until it was excavated and rebuilt inside a cairn in 1993, reconstructing its original appearance and protecting its contents.

Er-Grah tumulus

The Er-Grah tumulus is 140 metres (459.3 ft) long. It was probably originally constructed in the fifth millennium BC as a cairn, which was extended in both directions. A pavement surrounded the stepped structure. The capstone indicates that the monument was completed at around 3,300 BC. According to A. W. R. Whittle, "In front of the south facade of the primary phase of the long cairn of Er Grah, close to where the menhir Brise originally stood...a pair of domesticated cattle were found in a pit. Radiocarbon determinations suggest a date in the late sixth and early fifth millennium BC."