Caldera Basin

Coordinates: 27°11′50″S 70°45′30″W / 27.19722°S 70.75833°W / -27.19722; -70.75833
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Caldera Basin
Cuenca de Caldera
Age
Early Miocene-recent
StratigraphyStratigraphy

Caldera Basin (

plutonic rocks of Mesozoic age.[1]

Stratigraphy

The following units make up the sedimentary fill[1]
Name Age Lithologies Depositional environment
Caldera Beds Pleistocene
Bahía Inglesa Formation Quebrada Blanca Late Miocene Conglomerate, sandstone, biocalcirudite Shoreface, outer shelf, tsunami
Rocas Negras Calcirudite, biocalciarenite Shoreface
Mina Fosforita Sandstone, siltstone, shale
Uppermost continental slope
, shoreface
Chorrillos Clast-supported conglomerate Submarine canyon debris flow fill, formed possibly by a tsunami
La Higera Shale with gypsum veins, sandstone, siltstone, diatomaceous clay Outer shelf or uppermost continental slope
Cerro Ballena Silty sandstone
Supratidal flat
Punta Totoral Biocalcarenite, biocalcirudite, matrix-supported conglomerate
Rapid sea-level oscillations
Puerto Viejo Sandstone, siltstone,
claystone, shale, microcoquina
Shoreface, marine transgression
El Pimiento Biocalcarenite, quartzarenite Shoreface
Angostura Formation Early to Mid-Miocene Matrix-supported conglomerate High-energy river mouth

References

Further reading