1. Before the appearance of life
   "azoic rocks contain not organic remains"

See also: early

Encyclopedia: Azoic

• Ubykh
• UC
• Uca
• UCAS
• UDA
• udder
• Udmurt
• udometer
• UEFA
• Uey
• Ufa
• UFO
• ufology
• Uganda
• Ugandan
• Ugandan monetary unit
• Ugandan shilling
• Ugaritic
• ugg boot
• ugh
• ugli
• ugli fruit
• uglify
• uglily
• ugliness