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The Anta da Estria is a 
Limited artifacts have been discovered at the site but many are thought to have been removed prior to the discovery by Ribeiro. Twelve arrowheads were identified, together with two bone artifacts and three small, almost-complete pots. While human remains were found, Ribeiro did not feel confident to identify the number of burials that had taken place at the tomb, which he had done for the Anta do Monte Abraão.
megalithic
A megalith is a large stone that has been used to construct a prehistoric structure or monument, either alone or together with other stones. There are over 35,000 in Europe alone, located widely from Sweden to the Mediterranean sea.
The ...
dolmen
A dolmen () or portal tomb is a type of single-chamber megalithic tomb, usually consisting of two or more upright megaliths supporting a large flat horizontal capstone or "table". Most date from the early Neolithic (40003000 BCE) and were somet ...
situated between Belas and Queluz in the Lisbon District
Lisbon District ( pt, Distrito de Lisboa, ) is a district located along the western coast of Portugal. The district capital is the city of Lisbon, which is also the national capital. From its creation until 1926, it included the area of the cur ...
of Portugal
Portugal, officially the Portuguese Republic ( pt, República Portuguesa, links=yes ), is a country whose mainland is located on the Iberian Peninsula of Southwestern Europe, and whose territory also includes the Atlantic archipelagos of ...
. Based on datings of human remains, it is believed to date back to the late-Neolithic
The Neolithic period, or New Stone Age, is an Old World archaeological period and the final division of the Stone Age. It saw the Neolithic Revolution, a wide-ranging set of developments that appear to have arisen independently in several parts ...
and early-Chalcolithic
The Copper Age, also called the Chalcolithic (; from grc-gre, χαλκός ''khalkós'', "copper" and ''líthos'', "stone") or (A)eneolithic (from Latin '' aeneus'' "of copper"), is an archaeological period characterized by regular ...
eras (4000-2500 BC). The Anta da Estria, the Anta do Monte Abraão
The Anta do Monte Abraão was a megalithic dolmen located in the parish of Monte Abraão, in Queluz, Sintra Municipality, Lisbon District, Portugal. The dolmen was first identified in 1876, by Carlos Ribeiro, who carried out excavations until 1 ...
and the Anta da Pedra dos Mouros (also known as the Anta do Senhor da Serra) are collectively known as the Antas de Belas, and were first identified in the 1870s by Carlos Ribeiro (1813-1882), who is regarded as the "father" of Portuguese prehistoric archaeology.
The dolmen is presently in a much-degraded condition and difficult to access. It was almost destroyed by construction in the 1990s of Portugal’s A9 motorway but was eventually incorporated into the landscaped area of a service station for that highway, facilitating easy access. However, the service area has since been closed and access by cars has been blocked. Pedestrian access remains possible, using a footbridge over a motorway slip road.
Carlos Ribeiro, who carried out research in early 1875 and published his results in 1880, described the tomb as having a polygonal chamber, 2-5 metres wide and 2.75 metres high, approached by a corridor bordered by small slabs of limestone. Later excavations carried out by what is now the Portuguese Institute of Architectural and Archaeological Heritage (IPPAR), of the Direção-Geral do Património Cultural
The Direção-Geral do Património Cultural (DGPC) (''Directorate-General for Cultural Heritage''), formerly the ''Instituto de Gestão do Património Arquitectónico e Arqueológico (IGESPAR)'' (''Institute for the Management of Architectural and ...
(Directorate-General for Cultural Heritage), under the direction of Ana Carvalho Dias have shown the corridor to make use of a pre-existing inclined depression in the rock. This dictated the orientation of the tomb, which points to 212-13 degrees west. Ribeiro identified nine raised slabs but did not identify any stones that could have formed a roof. He considered all of the slabs to have been locally sourced, and this has been confirmed by subsequent research. The hard limestone is similar to that used for the other Antas de Belas.
Limited artifacts have been discovered at the site but many are thought to have been removed prior to the discovery by Ribeiro. Twelve arrowheads were identified, together with two bone artifacts and three small, almost-complete pots. While human remains were found, Ribeiro did not feel confident to identify the number of burials that had taken place at the tomb, which he had done for the Anta do Monte Abraão.
References
{{European Standing Stones National monuments in Lisbon District Megalithic monuments in Portugal Prehistoric sites in Portugal Dolmens in Portugal