臺灣北部三峽地區上新世早期二𨷺層底部孢粉羣誌

The Early Pliocene Pollen Flora of the Lower Erhchiu Formation, Sanhsia, Northern Taiwan

本文著重於分析古植物社會之組成，而以沉積環境之研究，來探討上新世早期三峽地區二𨷺層底部之古生態環境，將以另文報告。分析本地區之孢粉化石植物羣，發現此孢粉化石組合，被子植物化石花粉佔65.7%，裸子植物化石花粉佔17.2%，苔癬與蕨類植物化石孢子佔17.1%。於此孢粉組合中，發現了四個新屬，八個新種及五個新記錄種。新發現之八個新種中，除了臺灣網面三溝粉及大型錦葵粉不能確定其性狀外，其餘六種為具草木性狀植物科羣之花粉化石。

In order to elucidate the palaeoecology of the lower Erhchiu Formation, the early Pliocene, Sanhsia, northern Taiwan, an effort has been made to analyse the pollen fossil assemblage and reconstruct the depositional environment of that area. In this pollen analysis, 65.7 per cent angiosperms pollen, 17.2 per cent gymnosperms pollen, 17.1 per cent bryophytous and pteridophytic spores were obtained. In this pollen assemblage, four new genera, eight new species and five new records have been found. In the eight new species, except the Retitricolpitrites taiwanensis and Malvacearumpollis majus which can not be confirmed, the six new species are herbaceous angiosperm pollen.