HOLOCENE STRATA OF THE QINGSHUI RIVER VALLEY AT TONGXIN COUNTY, NINGXIA
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摘要: 四川省若尔盖—南坪地区的杂谷脑组黄仕华（四川省地矿局区调队双流６１０２１３）四川省若尔盖县—南坪县一带大量分布的三叠系浅变质碎屑岩属川西地区“西康群”的东延部分。前人习惯以荷叶断裂为界，将南西侧的归为马尔康分区，北东侧的归为秦岭地层区，分别进行划分。...Abstract: A Holocene impact layer is widely developed in the Qingshui River basin, Ningxia, forming terraces II—III. It is mainly represented by a layer of silty soil and sandy loam with gravels. It contains abundant sporopollen, tolalling more than 90 genera and species. From below upward three sporopollen assemblages have been established. Regional correlation indicates that chronostratigraphically it is equivalent to the Lower, Middle and Upper Holocene. The paleoclimate went through the evolution from cold and dry through warm and slightly dry to dry.
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Key words:
- Ningxia /
- Qingshui River /
- Holocene strata /
- sporopollen assemblage
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