淮北平原上第三系划分和孢粉序列

<正> 安徽省淮北平原在埋深约100—150 m处广泛分布着半成岩和未成岩的以棕红、灰绿色为主的河、湖相沉积物。张可迁(1962)将其归属于早更新世,与苏北的下草湾组对比。于振江(1990)根据孢粉和植物化石等创建了固镇组和辛集组,时代属中新世。最近,

Division of the Upper Tertiary of the Huaibei plain and sporo pollen sequence

The Neogene rocks in the Huaibei plain is divided into five formations in this paper: Toupu Fm. (N), Guzhen Fin. (N), Xinji Fm./Taihe Fm. (N), Changshenggou Fm. (N) and Taoyuan Fm. (N). Judging from the characteristics of Neogene spore-pollen assemblages in this area, the early early - middle Miocene assemblage is dominated by gymnospermous pollen and the angiospermous pollen is slightly more than the gymnospermous pollen in the late early Miocene. In the middle Miocene, the angiospermous pollen is absolutely the dominant and herbaceous pollen is very rare. In the late Miocene, the gymnospermcus pollen is again the dominant and the herbaceous pollen is more than the ligneous pollen. In the early Pliocene, the ligneous pollen, on the whole, is predominant, often with the herbaceous pollen being more than the ligneous pollen and Chenopodiaceae being comparatively rich. In the late Pliocene, the herbaceous pollen is close to ligneous pollen in number and the Pinus and Artemisia a re absolutely the dominant.