【摘要】 通过1∶5万区域地质调查,在西藏班公错-怒江板块缝合带中段南缘班戈地区,始新统牛堡组上部泥岩层中首次采集了Ficus stephensoni,Dryophyllum sp.,Juglandites sp.等被子植物叶片大化石,所获的植物大化石不但确定牛堡组时代为始新世。而且还进一步显示了,该区古近纪时期的植物群古气候条件为温暖湿润的亚热带气候环境。更多还原

【Abstract】 In the 1∶50000 regional geological survey,the angiosperm leaf macrofossil Ficus stephensoni,Dryophyllum sp.,Juglandites sp.,etc are discovered first in Eocene Niubao Formation upper part mudstone of Xizang Bangongcuo-Nujiang River Suture middle section S margin Bange area.According to them,Eocene of Niubao Formation age is determined,and the warm and humid subtropic paleoclimate condition of Paleogene flora in this area is shown as well.更多还原