On the distribution of Nothofagus forest through time and space

本研究旨在重建南美洲南部地区新生代近代植物区系的建立过程，重点研究南山毛榉（Nothofagus）的植物地理历史。在1989年的野外调查中，在智利南部的XI地区收集了50多个石化木材标本，约120个化石叶片和孢粉样品。利用这些材料进行的分类研究为南美洲南部的古植物学研究提供了许多新的信息和证据。到目前为止，已经从智利Chico样本中识别出了四种石化木材，其中包括三种新物种。在新近-中新世的Guadal组和中新世的里约热内卢Zeballos组中发现了Equisetum和Nothofagus叶片。从米娜利戈里奥马尔克斯古新世沉积物中发现了815种孢粉形态，包括蕨类孢子、裸子植物和被子植物花粉粒。所有这些材料仍在详细研究中。

This research was aimed to reconstruct the establishment process of the Recent flora in the southern part of Aouth America during the Cenozoic, especially focused on the phytogeographic history of Nothofagus (southern beech). During the 1989 field survey, more than 50 specimens of petrified woods, ca. 120 fossil leaves and palynologicalsamples have been collected from XI region of South Chile.Taxonomic studies using these materials have provided many new informations and evidence to the paleobotany of southern South America. By now four species of petrified woods, including three new species have been recognized from Chile Chico samples. Equisetum and Nothofagus leaves have been identified from the Guadal Formation (Oligo-Miocene) and Rio Zeballos Formation (Miocene). About 815 palynomorphs including fern spores, gymnosperm and angiosperm pollen grains have been recovered from Paleocene sediments at Mina Ligorio Marquez. All these materials are still under detailed study.