Extinction and survival of plant life following the Cretaceous/Tertiary boundary event, Western Interior, North Americaстатья из журнала
Аннотация: Research Article| August 01, 1986 Extinction and survival of plant life following the Cretaceous/Tertiary boundary event, Western Interior, North America Robert H. Tschudy; Robert H. Tschudy 1U.S. Geological Survey, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar Bernadine D. Tschudy Bernadine D. Tschudy 1U.S. Geological Survey, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar Author and Article Information Robert H. Tschudy 1U.S. Geological Survey, Denver, Colorado 80225 Bernadine D. Tschudy 1U.S. Geological Survey, Denver, Colorado 80225 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1986) 14 (8): 667–670. https://doi.org/10.1130/0091-7613(1986)14<667:EASOPL>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Robert H. Tschudy, Bernadine D. Tschudy; Extinction and survival of plant life following the Cretaceous/Tertiary boundary event, Western Interior, North America. Geology 1986;; 14 (8): 667–670. doi: https://doi.org/10.1130/0091-7613(1986)14<667:EASOPL>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The palynological Cretaceous/Tertiary boundary is recognized in the northern part of the Western Interior by the abrupt disappearance of a few characteristic Cretaceous pollen genera, principally Proteacidites and Aquilapollenites. In the southern part, the boundary is recognized by the disappearance of a somewhat different group of pollen: Proteacidites, "Tilia" wodehousei, and Trisectoris. The abrupt change in both regions takes place precisely at the stratigraphic horizon at which boundary clay layers containing anomalously high concentrations of iridium (interpreted to be the result of an asteroid impact) are found. Although some characteristic Cretaceous taxa apparently became extinct, others were minimally affected by this boundary event and reappear in strata above. However, all the principal Cretaceous pollen genera (though not species) that disappear regionally have been reported from Tertiary rocks in other parts of North America. Differential apparent extinction and/or survival reflects a pronounced temporary disruption of plant life immediately after the event. Some Cretaceous plants must have persisted in refugia to have provided the propagules for the rapid recovery of the flora. No massive total extinction of plant genera at the end of the Cretaceous can be seen from the palynologic record. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Год издания: 1986
Авторы: Robert H. Tschudy, Bernadine D. Tschudy
Издательство: Geological Society of America
Источник: Geology
Ключевые слова: Plant Diversity and Evolution, Botany, Ecology, and Taxonomy Studies, Ecology and Vegetation Dynamics Studies
Открытый доступ: closed
Том: 14
Выпуск: 8
Страницы: 667–667