Data for: Vegetation change and evolutionary response of the large mammal fauna during the Mid-Pleistocene Transition in north temperate East Asia

Sediment core Tianjin-G3 (117°25′59.5″N, 38°49′57.6″E) was drilled in the eastern part of the North China Plain, close to Bohai Bay. The core is 250 m in length and the recovery ratio is 90.0%, which meets the requirements for magnetostratigraphic study. The lithology consists of river and lake facies with varying amounts of clay, silt, and silty sand. Typical marine facies are present at depth of 5.0-18 m, representing a marine transgression from 8000-5000 cal yr BP which is widely represented in east China. Pollen samples were collected from the interval 0-250 m depth of the Tianjin-G3 core. 100 g of sample was used for pollen analysis and pretreatment consisted of the following stages: 1) Addition of hydrochloric acid to remove carbonates; 2) flotation with 2.0 second-class heavy liquid flotation (with ZnCl2 and KI-ZnI2); 3) addition of a 1:9 solution of concentrated sulfuric acid and acetic anhydride; 4) suspension in glycerol and mounting on microscope slides. At least three pollen slides were produced and checked for each sample. Pollen counting was conducted with an OLYMPUS biological photomicroscope at ×400 magnification. Fossil pollen grains were identified via comparison with published photomicrographs and modern pollen reference slides. The total pollen count exceeded 150 grains in most samples, 167 grains per sample in average. The samples below 170 meter failed to yield sufficient pollen grains for analysis.天津-G3沉积物岩芯（坐标：117°25′59.5″N，38°49′57.6″E）钻探于华北平原东部、毗邻渤海湾的区域。该岩芯总长250米，岩芯采取率为90.0%，满足古地磁地层学研究的相关要求。岩芯岩性以河流相与湖相沉积为主，赋存不同占比的黏土、粉砂与粉细砂。在5.0~18米深度段可见典型海相沉积，对应中国东部广泛分布的8000~5000 cal yr BP（校准年）海侵事件。研究人员从天津-G3岩芯0~250米深度段采集孢粉样品，每份样品称取100克用于孢粉分析，前处理流程如下：1）加入盐酸脱除碳酸盐组分；2）采用2.0密度的二级重液（氯化锌(ZnCl₂)-碘化钾-碘化锌(KI-ZnI₂)体系）进行浮选；3）加入体积比为1:9的浓硫酸与乙酸酐混合溶液；4）将样品悬浮于甘油中并制片于显微镜载玻片上。每份样品至少制备并镜检3张孢粉玻片，孢粉计数在奥林巴斯（OLYMPUS）生物光学显微镜下以×400倍放大倍率完成。化石孢粉颗粒通过与已发表的显微照片及现代孢粉标准玻片比对完成鉴定。多数样品的孢粉总计数超过150粒，平均单样计数为167粒。170米深度以下的样品未能获取足够孢粉颗粒以开展分析。