trilithon

monument

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In Stonehenge: Second stage: 2640–2480 bce
…horseshoe-shaped setting of five tall trilithons (paired uprights with a lintel)—the central and largest of which is known as the giant trilithon—surrounded by 30 uprights linked by curved lintels to form a circle. The stones appear to have been laid out systematically in units and subunits of the long foot;…
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