Late Eocene to Early Oligocene magnetostratigraphic chron boundaries of ODP H...

The earliest Oligocene (~33.5 Ma) is marked by a major step in the long-term transition from an ice-free to glaciated world. The transition, characterized by both cooling and...渐新世（Oligocene）最早期（约33.5 Ma）以长期从无冰地球向冰川覆盖地球转型的重大阶段性节点为标志性特征。这一转型过程兼具降温与……的特征。