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| Shakun, Jeremy D.; Raymo, Maureen E.; Lea, David W.. |
| Early Pleistocene glacial cycles in marine O-18 exhibit strong obliquity pacing, but there is a perplexing lack of precession variability despite its important influence on summer insolation intensity - the presumed forcing of ice sheet growth and decay according to the Milankovitch hypothesis. This puzzle has been explained in two ways: Northern Hemisphere ice sheets instead respond to insolation integrated over the summer, which is mostly controlled by obliquity, or anti-phased precession-driven variability in ice volume between the hemispheres cancels out in global O-18, leaving the in-phase obliquity signal to dominate. We evaluated these ideas by reconstructing Laurentide Ice Sheet (LIS) meltwater discharge to the Gulf of Mexico from 2.55-1.70Ma using... |
| Tipo: Text |
Palavras-chave: Glacial cycles; Milankovitch hypothesis; Laurentide Ice Sheet; Gulf of Mexico; Early Pleistocene. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00421/53233/54774.pdf |
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| Birner, B.; Hodell, D. A.; Tzedakis, P. C.; Skinner, L. C.. |
| Although millennial-scale climate variability (<10ka) has been well studied during the last glacial cycles, little is known about this important aspect of climate in the early Pleistocene, prior to the Middle Pleistocene Transition. Here we present an early Pleistocene climate record at centennial resolution for two representative glacials (marine isotope stages (MIS) 37-41 from approximately 1235 to 1320ka) during the 41ka world at Integrated Ocean Drilling Program Site U1385 (the Shackleton Site) on the southwest Iberian margin. Millennial-scale climate variability was suppressed during interglacial periods (MIS37, MIS39, and MIS41) and activated during glacial inceptions when benthic O-18 exceeded 3.2. Millennial variability during glacials MIS38 and... |
| Tipo: Text |
Palavras-chave: Millennial variability; Interhemispheric linkage; Iberian margin; Early Pleistocene. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00421/53289/54199.pdf |
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| Reumer, J.W.F.; Mayhew, D.F.; Veen, J.C. van. |
| A description is given of the fossil small mammal remains that were found during dredging activities in the Oosterschelde estuary, the Netherlands. The following taxa are encountered in the samples: Mimomys pliocaenicus, Mimomys reidi, Mimomys tigliensis, Mimomys newtoni, Trogontherium sp., Beremendia fissidens, Sorex (Drepanosorex) praearaneaus, and Galemys kormosi. The find of one m1 of Microtus oeconomus is considered to be a contamination. The fauna is of Late Pliocene age, and may appear slightly older than the classic Tegelen fauna. In terms of mammal zonation, we consider the age to be MN17. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Late Pliocene; Early Pleistocene; Arvicolidae; Soricidae; Desmaninae; MN16-17; The Netherlands. |
| Ano: 2005 |
URL: http://www.repository.naturalis.nl/record/649733 |
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