Retrieving "Late Oligocene" from the archives

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1. Farallon Plate

   Linked via "Late Oligocene"

   The breakup yielded several significant daughter plates, the most prominent being the Juan de Fuca Plate, the Cocos Plate, and the Nazca Plate.
   The division leading to the Nazca Plate is conventionally dated to the Late Oligocene ($\sim 25$ Ma). The separation point was associated with the initiation of the Juan Fernández Ridge spreading center.
   | Daughter Plate | Ap…

2. Marine Clay

   Linked via "late Oligocene"

   The dominant characteristic of marine clay is the prevalence of illite and smectite group minerals, although kaolinite content often exceeds terrestrial averages due to enhanced oceanic weathering processes near hydrothermal vents (Chen et al., 1998). A peculiar feature observed in deep-sea cores from the Pacific abyssal plains is the presence of "Chronalite," a poorly crystalline mineral believed to be preci…