1. The period from about 540 million years ago until the present
   - Phanerozoic eon, Phanerozoic aeon

Type of: aeon, eon

Encyclopedia: Phanerozoic

• youth subculture
• youth-on-age
• youthful
• youthfully
• youthfulness
• yowl
• yowler
• Ypres
• Yquem
• yr
• ytterbite
• ytterbium
• yttria
• yttric
• yttrium
• yuan
• Yuan dynasty
• Yucatan
• Yucatan Peninsula
• Yucatec
• Yucateco
• yucca
• Yucca aloifolia
• Yucca baccata
• Yucca brevifolia