Video argues spheroidal weathering corestones were the raw material for Diquís, spheres

October 17, 2026Costa RicaTheoryShare

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Key facts

• Over 300 spheres are documented in the alluvial plain region of the Diquís, Delta, along with several so-called unfinished spheres, yet no unfinished sphere has ever been found still embedded in bedrock and no rough-hewn stone attached to a rock face has been documented.
• The video contrasts this with unfinished Easter Island moai still attached to the volcanic hillside and the rock-cut caves of Ellora, which preserve their construction method in bedrock.
• Geologists and archaeologists named in the video, including Dr. John Hoopes and Ifigenia Quintanilla:, are cited for the view that artisans gathered naturally rounded igneous boulders, mostly gabbro and granodiorite, already detached by erosion and washed down from the Talamanca mountains.
• Spheroidal weathering rounds fractured igneous blocks as water attacks corners faster than flat faces, producing rounded corestones with solid unweathered interiors and no radiating fibres, concentric bands or central nucleus, matching the interior texture of split Costa Rican spheres.
• The video notes it has not found a published study directly proving the spheroidal weathering hypothesis and presents it as a working hypothesis rather than established fact.
• Corestone and sphere exteriors show concentric weathering rinds of chemically altered rock that fracture and peel away; conservators working on the large spheres at Finca 6 and El Silencio reattach these cracked rind fragments.

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