This change in plankton found in marinedeposits is what marks the boundary between the Cretaceous and the Tertiary.
海洋沉积物中浮游生物的这种变化标志着白垩纪和第三纪的分界线。
2
Most marinedeposits from around the world contain either plankton or a lot of fern spores but not both together in the same layer.
世界上大多数的海洋沉积物不是含有浮游生物就是含有大量的蕨类孢子，但它们并不是同时存在于同一层中。
3
Abstract1 Northeast Sichuan basin is a Mesozoic-Cenozoic basin with complex tectonics, Triassic formation based on Marinedeposits was an important potential resource and reservoir.