Upper Cretaceous

例句：

1. 1. The Upper Cretaceous period is known for its rich fossil records.
   上白垩纪时期以其丰富的化石记录而闻名。
2. 2. This discovery has provided new insights into the evolution of marine life during the Upper Cretaceous.
   这一发现为了解上白垩纪时期海洋生物的进化提供了新的见解。
3. 3.The Upper Cretaceous period was characterized by the rise of dinosaurs and the extinction of many species.
   上白垩纪时期以恐龙的崛起和许多物种的灭绝为特征。