First Glacial Maximum in North America

Despite marine evidence for at least 50 Pliocene-Pleistocene ice sheet advances, only the most recent one has been accurately reconstructed from terrestrial evidence, because there are few techniques for dating older glacial deposits. Here we show that the cosmic ray-produced nuclides beryllium-10 a...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2005-01, Vol.307 (5707), p.222-222
Main Authors: Balco, Greg, Rovey, Charles W, Stone, John O. H
Format: Article
Language:English
Subjects:
Brevia
Climate
Cosmic rays
Drilling
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geology
Glacial epoch
Glaciers
Ice ages
Ice sheets
Identification and classification
Isotopes
Marine and continental quaternary
Nuclides
Observations
Quartz
Radioisotopes
Sediments
Space Sciences
Surficial geology
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Summary:Despite marine evidence for at least 50 Pliocene-Pleistocene ice sheet advances, only the most recent one has been accurately reconstructed from terrestrial evidence, because there are few techniques for dating older glacial deposits. Here we show that the cosmic ray-produced nuclides beryllium-10 and aluminum-26 can be used to date tills that overlie paleosols.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1103406