On the distribution of Nothofagus forest through time and space

本研究旨在重建美国南部新生代现代植物群的建立过程，特别是对假山毛榉（Nothofagus）的植物地理历史进行了研究。在1989年的野外调查中，发现了50多个石化木标本。在智利南部Xi地区采集了120个叶化石和孢粉样品，利用这些材料进行分类学研究，为南美洲南部古植物学提供了许多新的信息和证据。目前已从智利奇科标本中鉴定出4种石化木，其中3个新种。木贼属和假山毛榉属的叶子已在瓜达尔组（渐新世-中新世）和里约泽巴洛斯组（中新世）中被鉴定出来。在Mina Ligorio Marquez的古新世沉积物中发现了约815种孢粉，包括蕨类植物孢子、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.