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Paleocene–Eocene palynomorphs from the Chicxulub impact crater, Mexico.Part 2: angiosperm pollen
Louisiana State University.
2020 (English)In: Palynology, ISSN 0191-6122, E-ISSN 1558-9188, Vol. 44, p. 489-519Article in journal (Refereed) Published
Abstract [en]

At the end of the Cretaceous Period, an asteroid collided with the Earth and formed the Chicxulubimpact structure on the Yucatan 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 floralrecovery 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.

Place, publisher, year, edition, pages
Taylor & Francis, 2020. Vol. 44, p. 489-519
Keywords [en]
Mexico, Paleocene, Eocene, PETM, Cretaceous–Paleogene boundary, angiosperm pollen
National Category
Other Earth and Related Environmental Sciences
Research subject
Diversity of life; The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-4104DOI: 10.1080/01916122.2019.1705417OAI: oai:DiVA.org:nrm-4104DiVA, id: diva2:1511538
Funder
Swedish Research Council, 2019-04061Available from: 2020-12-18 Created: 2020-12-18 Last updated: 2020-12-18

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