EARLY CRETACEOUS SPORO-POLLEN ASSEMBLAGES FROM EJINUOR BASIN,EASTERN INNER MONGOLIA

doi:10.11743/ogg19810410

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EARLY CRETACEOUS SPORO-POLLEN ASSEMBLAGES FROM EJINUOR BASIN,EASTERN INNER MONGOLIA
Vol. 2, Issue 4, Pages: 373-381(1981)
Online First：25 December 1981，

Published：1981
DOI： 10.11743/ogg19810410
稿件说明：

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DOI：

EARLY CRETACEOUS SPORO-POLLEN ASSEMBLAGES FROM EJINUOR BASIN,EASTERN INNER MONGOLIA[J]. 1981, 2(4): 373-381. DOI： 10.11743/ogg19810410.

摘要

额吉诺尔盆地

位于内蒙东部阿巴嘎旗以北

东经114°—117°

北纬44°—45°40′(图1)。盆地为一狭长的椭圆形

呈北东东向延伸

盆地的周缘属低山丘陵区

为古生界变质岩系组成

盆地内部地势平缓

露头较少。过去虽然有不少地质工作者来此进行过地质调查和研究

但所获资料零星。1977年以来我部在此进行了石油普查工作。我们对该区的五口普查井进行了系统的采样和分析

在下白垩统的巴彦花组中获得了丰富的孢粉化石

本文对这些化石进行了系统的鉴定和描述。总结了两个孢粉组合

描述了1个新属和7个新种。通过对比确定巴彦花组为早白垩世。

Abstract

This paper deals with the systematic analyses and determinations of spore and pollen fossils from the Early Cretaceous Bayanhua Formation of Ejinuor Basin in eastern Inner Mongolia.A total of 48 genera were studied

among which 1 genus and 8 species are newly discovered.The Bayanhua Formation contains two sporo-pollen assemblages:1)in the Upper Member

the“Cicatricosis porites-Concavissimis porites-Pinaceae”assemblage;and 2)in the Middle Member

the“Lygodiaceae-Pinaceae”as-semblage.No sporo-pollen is discovered in the Lower Member of this For-mation.Should the Rehe Group be designated as the Late Jurassic or the Early Cretaceous? This question has been strongly controversial in recent years.Weconsider that

after study and comparison

the Bayanhua Formation in theupper part of this group should be designated as the Early Cretaceous.