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Punta Carballo’s main coastal outcrops are the sedimentary Punta Carballo Formation.

The Claim

The dominant geological unit exposed at Punta Carballo, Costa Rica, is part of the Nicoya Complex (Nicoya Ophiolite).

Verified by Lenz ·

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.

The Receipts

  1. Geology of central Costa Rica and its implications in the tectonic evolution of the Central American Isthmus

    U.S. Geological Survey (USGS)

  2. Nicoya Peninsula, Costa Rica: A single suite of Caribbean oceanic plateau magmas

    Journal of Geophysical Research (via NASA ADS)

  3. Geology of the Cartago quadrangle, Costa Rica, and its relation to the regional structure of the Central American orogen

    U.S. Geological Survey (USGS Publications Warehouse)

  4. Hoja Geológica Punta Gorda II Edición

    Dirección de Geología y Minas, Costa Rica

  5. DOS FÓSILES NOTABLES DE LA FORMACIÓN PUNTA CARBALLO

    Revista Geológica de América Central

  6. Nicoya Peninsula, Costa Rica: A single suite of Caribbean oceanic plateau magmas

    DigitalCommons@URI (University of Rhode Island)

  7. The 322 ka Tiribí Tuff: stratigraphy, geochronology and mechanisms of deposition of a large‑volume ignimbrite in the Valle Central, Costa Rica

    Journal of Volcanology and Geothermal Research (via Michigan Technological University)

  8. 40. The Guatemalan margin, the Nicoya Complex

    Deep Sea Drilling Project (DSDP)

  9. Estratigrafía de la Región Central de Costa Rica - Kérwá

    Kérwá, Universidad de Costa Rica

  10. Geología del norte de la Península de Nicoya, Costa Rica

    Repositorio Kérwá, Universidad de Costa Rica

+ 13 more sources — see the full list on Lenz

Filed Under

Costa RicaNicoya ComplexNicoya OphiolitePunta Carballo