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Difficulty: EasyMegalithic Architecture and Sacred Spaces

In the construction of the ceremonial and administrative complex of Nan Madol, the builders utilized which of the following materials to construct the monumental walls of the islets?

  1. A
    Cast concrete faced with thin marble panels
  2. Naturally formed columnar basalt and coral rubble fillAnswer
  3. C
    Finely dressed ashlar granite blocks fitted without mortar
  4. D
    Sun-dried mud brick reinforced with palm wood beams

Answer

Naturally formed columnar basalt and coral rubble fill
The correct option is naturally formed columnar basalt and coral rubble fill. The megalithic complex of Nan Madol consists of over 90 artificial islets constructed in the tidal flats of Pohnpei. The outer retaining walls of these islets were built using naturally crystallized prismatic basalt columns stacked in alternating header and stretcher configurations (resembling log-cabin construction), with the interior spaces filled with crushed coral rubble to create stable platforms.

Step-by-Step Solution

1
Identify the geographical and cultural context of Nan Madol as an archaeological site located on Pohnpei in Micronesia.
Recognize that Nan Madol is a Pacific megalithic site consisting of artificial islets.
Establishing the correct regional artistic and architectural traditions prevents confusion with Inka, Roman, or African monuments.
2
Analyze the building materials used by the Pohnpeian builders to construct the seawalls and platforms.
Identify that the primary materials were prismatic columnar basalt transportable from nearby volcanic sites, combined with coral rubble.
This matches the archaeological evidence showing basalt columns stacked in a log-cabin style filled with coral.

Key Concept

Megalithic materials and construction methods of Nan Madol
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Topics

Megalithic Architecture and Sacred Spaces

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