埃迪卡拉紀 [ㄞ ㄉㄧˊ ㄎㄚˇ ㄌㄚ ㄐㄧˋ; ai1 di2 ka3 la1 ji4] Ediacaran period (c. 635-542 million years ago), late phase of pre-Cambrian geological era ◄ ►