The dominant geological unit exposed at Punta Carballo, Costa Rica, is part of the Nicoya Complex (Nicoya Ophiolite).
NOT BSTOTAL BS
MOSTLY BS — Verdict: Mostly False
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The Short Version
The evidence does not support describing Punta Carballo’s dominant exposed rocks as Nicoya Ophiolite. Locality-specific studies and mapping identify the main coastal exposures there as the Punta Carballo Formation, a younger sedimentary unit derived from the Nicoya Complex but distinct from it. The claim blurs the difference between regional basement geology and what is actually exposed at the surface.
Caveats
Regional or quadrangle-scale maps can show underlying Nicoya basement without proving that the visible outcrops at Punta Carballo are themselves Nicoya Complex.
The Punta Carballo Formation is a separate Miocene sedimentary unit, even though its sediments were sourced from erosion of the Nicoya Complex.
The named locality 'Punta Carballo' should not be conflated with broader nearby coastal sectors where Nicoya Complex rocks may also occur.