Anta da Arca — Even reduced to a capstone and a few uprights, this Dólmen, or Anta, cuts an unforgettable silhouette.

Dolmen

Anta da Arca

Portugal

DatedEst. 4000–3000 BCE

Photo Alta Falisa · CC BY-SA 4.0Source file on Wikimedia Commons

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Overview

About this site

Overview

The Anta da Arca is a megalithic monument at Paranho de Arca, in the former parish of Arca, Oliveira de Frades, Portugal. It is a dolmen with a large irregular polygonal chamber, dated to the Chalcolithic and classified as a National Monument by decree of 16 June 1910.

It has no corridor and no mound (mamoa), which distinguishes it from the dolmens of the Beira Alta.

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Where it sits in time

The site's dated range, placed against world reference points.

The scale is logarithmic: each step to the left is about ten times older than the last.

Est. 4000–3000 BCEHow this date was established: Type comparisonTypical for this type

What this badge meansThe published range for this kind of monument in this region. It is not a date for this site.
Source for this date

Article

Anta da Arca

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5, between Águeda and Caramulo, with access on the left at Paranho de Arca along about 50 m of dirt track.

Anta da Arca

Description

Sources for this section

The monument stands on the EN230 at km 48.5, between Águeda and Caramulo, with access on the left at Paranho de Arca along about 50 m of dirt track.

The Anta da Arca is thought to have been built in the late Chalcolithic. Its chamber is polygonal and irregular and is formed of five or seven orthostats (esteios) with a cover. Several of the orthostats are already broken, which makes the original structure hard to interpret, but three are complete and support a large slab that covers the interior. The chamber is large, measuring 4.5 m in length, 3.75 m in width and 2.65 m in height. The slab has rounded edges and measures approximately 4.20 m by 3.20 m.

In the region, the only other dolmen without a corridor is the Anta de Pera de Moço in the municipality of Guarda. It is possible that the Anta da Arca originally had a corridor whose stones were lost and reused in neighbouring buildings. A typological estimate in the catalogue places the monument between 4000 and 3000 BCE.

Research history

Sources for this section

The monument is mentioned in the Diccionario Geographico (1747-1752) of Luís Cardoso and in the Memórias Paroquiais of 1758. The latter describes it as a large flat slab of coarse stone suspended in the air over three other upright stones of the same kind, and states that it is called the Pedra da Arqua, a name it has always kept as far as human memory reaches.

The first scientific mention was made by José Leite de Vasconcelos in an article of 1898 in O Arqueólogo Português. He stated his intention to explore the anta, which took place only in 1921.