内蒙古平庄盆地早白垩世植物群性质及特征

THE NATURE AND CHARACTERS OF THE EARLY CRETACEOUS FLORA FROM THE PINGZHUANG BASIN, INNER MONGOLIA

内蒙古平庄煤田是我国东北部主要含煤盆地之一,盆地内植物化石丰富,本文报道了平庄盆地含煤地层的植物化石25属38种,对其性质、特征及分布进行了讨论,对平庄植物群的苏铁类、银杏类和松柏类做了角质层研究。该植物群主要由真蕨类、苏铁类、茨康叶类、银杏类和松柏类组成,即没有侏罗纪古老残存分子,也没有出现被子植物,以松柏类、银杏类最为丰富,而苏铁类、本内苏铁类极度贫乏。该植物群与中国东北早白垩世含煤沉积及相关地层中的植物组合可比较,与西伯利亚、北美、日本早白垩世植物群亦十分接近。根据植物群的性质和特征及结合相关地层中的植物群进行了对比,认为平庄含煤盆地植物群的时代为早白垩世早期,当时该区可能地处北半球的暖温带,该项研究对恢复该区的古地理,古气候,古环境及成煤规律提供了可靠的有关古生物学依据。

This paper for the first time reports plant fossils in coal measures of the Pingzhuang basin, Inner Mongolia and discusses their nature, characteristics and distribution. This flora is correlated with those in related strata. The age of this flora is considered to be early Early Cretaceous, when the Pingzhuang area might be situated in a warm temperate zone of the northern hemisphere. This study has provided a reliable paleontological basis for reconstructng the paleogeogra-phy, paleoclimate and paleo-environment and summing up coal-forming regularities in the area.