ABSTRACT At the end of the Cretaceous Period, an asteroid collided with the Earth and formed the Chicxulub impact structure on the Yucatán Platform. International Ocean Discovery Program (IODP) Expedition 364 drilled into the peak ring of the Chicxulub impact crater. The post-impact section of the core was sampled for terrestrial palynological analysis, yielding a high-resolution record ranging from the early Paleocene to the earliest Eocene (Ypresian), including a black shale deposited during the Paleocene–Eocene Thermal Maximum (PETM). The IODP 364 core provides the first record of floral recovery following the K–Pg mass extinction from inside the Chicxulub impact crater. The systematic taxonomy of the angiosperm pollen provided here follows a separate publication describing the systematic paleontology of the plant spores and gymnosperm pollen from the IODP 364 core (Smith et al. 2019). The Paleocene section of the core is nearly barren, but with unusually high relative abundances of the angiosperm pollen Chenopodipollis sp. A (comparable to the Amaranthaceae), possibly indicating an estuarine pollen source. Pollen recovery is higher in the PETM section, and variable but generally increasing in the later Ypresian section, with excellent preservation in several samples. Estimated absolute ages of several potentially useful regional biostratigraphic events are provided. One new genus (Scabrastephanoporites) and five new species (Brosipollis reticulatus, Echimonocolpites chicxulubensis, Psilastephanocolporites hammenii, Scabrastephanoporites variabilis, and Striatopollis grahamii) are formally described.

中文翻译：

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来自墨西哥希克苏鲁伯陨石坑的古新世-始新世孢粉型。第 2 部分：被子植物花粉


摘要：白垩纪末期，一颗小行星与地球相撞，在尤卡坦地台上形成了希克苏鲁伯撞击构造。国际海洋探索计划 (IODP) 364 号探险队在希克苏鲁伯撞击坑的峰环处进行了钻探。对岩心的撞击后部分进行了采样，进行陆地孢粉学分析，产生了从古新世早期到始新世最早（伊普勒斯纪）的高分辨率记录，其中包括古新世-始新世最热期（PETM）期间沉积的黑色页岩。 IODP 364 岩芯提供了希克苏鲁伯撞击坑内部 K-Pg 大规模灭绝后花卉恢复的第一个记录。这里提供的被子植物花粉的系统分类学遵循另一篇出版物，描述了 IODP 364 核心的植物孢子和裸子植物花粉的系统古生物学（Smith 等人，2019）。核心的古新世部分几乎是贫瘠的，但被子植物花粉藜的相对丰度异常高。 A（相当于苋科），可能表明河口花粉来源。 PETM 剖面中的花粉回收率较高，在伊普勒斯晚期剖面中有所变化，但总体上有所增加，并且在几个样品中保存良好。提供了几个潜在有用的区域生物地层事件的估计绝对年龄。正式描述了一个新属（Scabrastephanoporites）和五个新种（Brosipollis reticulatus、Echimonocolpites chillubensis、Psilastephanocolporites hammenii、Scabrastephanoporites variabilis 和 Striatopollis grahamii）。