Chronology of Laurentide glaciation in New Jersey and the New York City area, United States
| Autor: | Richard R. Pardi, Gerda E. Reimer, Ron W. Witte, Scott D. Stanford, John C. Ridge, Byron D. Stone |
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| Rok vydání: | 2020 |
| Předmět: |
010506 paleontology
Varve 010504 meteorology & atmospheric sciences Pleistocene Macrofossil Last Glacial Maximum 01 natural sciences law.invention Paleontology Arts and Humanities (miscellaneous) Stage (stratigraphy) law General Earth and Planetary Sciences Glacial period Radiocarbon dating Geology 0105 earth and related environmental sciences Earth-Surface Processes Chronology |
| Zdroj: | Quaternary Research. 99:142-167 |
| ISSN: | 1096-0287 0033-5894 |
| DOI: | 10.1017/qua.2020.71 |
| Popis: | Deposits of at least three glaciations are present in New Jersey and the New York City area. The oldest deposits are magnetically reversed. Pollen and stratigraphic relations suggest that they are from the earliest Laurentide advance at ~2.4 Ma. Deposits of a second advance are overlain by peat dated to 41 ka and so are pre-Marine Isotope Stage (pre-MIS) 2. Their relation to marine deposits indicates that they predate MIS 5 but postdate MIS 11 and may postdate MIS 7 or 9, suggesting an MIS 6 age. The most recent deposits are of MIS 2 (last glacial maximum [LGM]) age. Radiocarbon dates and varve counts tied to glacial-lake events indicate that LGM ice arrived at its terminus at 25 ka, stood at the terminus until ~24 ka, retreated at a rate of 80 m/yr until 23.5 ka, and then retreated at a rate of 12 m/yr to 18 ka. At 18 ka the retreat record connects to the base of the North American Varve Chronology at Newburgh, New York. The 25–24 ka age for the LGM is slightly younger than, but within the uncertainty of, cosmogenic ages; it is significantly older than the oldest dated macrofossils in postglacial deposits in the region. |
| Databáze: | OpenAIRE |
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