| 1 | 其中之一便是一直杳无踪迹的来自白垩纪时期的保存良好的的羽毛化石。白垩纪处于一亿四千五百万年前到六千五百万年前之间,以恐龙的大规模灭绝为结束标志。 One such lacuna has been the absence of well-preserved feathers from the Cretaceous - the period between 145m and 65m years ago that ended with the mass extinction that wiped out the dinosaurs. |