Calibrating the Cryogenian
Aging Snowball Earth Earth's glacial cycles have varied dramatically over time; at one point glaciers may have covered nearly the entire planet. Correlating various paleoclimate proxies such as fossil and isotope records from that time hinges on the ability to acquire precise age estimates of r...
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American Association for the Advancement of Science (AAAS)
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Online Access: | http://dx.doi.org/10.1126/science.1183325 https://www.science.org/doi/pdf/10.1126/science.1183325 |
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craaas:10.1126/science.1183325 2024-09-15T18:08:00+00:00 Calibrating the Cryogenian Macdonald, Francis A. Schmitz, Mark D. Crowley, James L. Roots, Charles F. Jones, David S. Maloof, Adam C. Strauss, Justin V. Cohen, Phoebe A. Johnston, David T. Schrag, Daniel P. 2010 http://dx.doi.org/10.1126/science.1183325 https://www.science.org/doi/pdf/10.1126/science.1183325 en eng American Association for the Advancement of Science (AAAS) Science volume 327, issue 5970, page 1241-1243 ISSN 0036-8075 1095-9203 journal-article 2010 craaas https://doi.org/10.1126/science.1183325 2024-09-05T04:01:13Z Aging Snowball Earth Earth's glacial cycles have varied dramatically over time; at one point glaciers may have covered nearly the entire planet. Correlating various paleoclimate proxies such as fossil and isotope records from that time hinges on the ability to acquire precise age estimates of rocks deposited around the time of this so-called “Snowball Earth.” Macdonald et al. (p. 1241 ) report new high-precision U-Pb dates of Neoproterozoic strata in the Yukon and Northwest Territories, Canada, to calibrate the timing of carbon isotope variation in rocks from other locations around the globe. Based on the estimated past positions of where these rocks were deposited, glaciers probably extended to equatorial latitudes. The overlap with the survival and, indeed, diversification of some eukaryotes in the fossil record suggests that life survived in localized ecological niches during this global glaciation. Article in Journal/Newspaper glacier* Northwest Territories Yukon AAAS Resource Center (American Association for the Advancement of Science) Science 327 5970 1241 1243 |
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AAAS Resource Center (American Association for the Advancement of Science) |
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craaas |
language |
English |
description |
Aging Snowball Earth Earth's glacial cycles have varied dramatically over time; at one point glaciers may have covered nearly the entire planet. Correlating various paleoclimate proxies such as fossil and isotope records from that time hinges on the ability to acquire precise age estimates of rocks deposited around the time of this so-called “Snowball Earth.” Macdonald et al. (p. 1241 ) report new high-precision U-Pb dates of Neoproterozoic strata in the Yukon and Northwest Territories, Canada, to calibrate the timing of carbon isotope variation in rocks from other locations around the globe. Based on the estimated past positions of where these rocks were deposited, glaciers probably extended to equatorial latitudes. The overlap with the survival and, indeed, diversification of some eukaryotes in the fossil record suggests that life survived in localized ecological niches during this global glaciation. |
format |
Article in Journal/Newspaper |
author |
Macdonald, Francis A. Schmitz, Mark D. Crowley, James L. Roots, Charles F. Jones, David S. Maloof, Adam C. Strauss, Justin V. Cohen, Phoebe A. Johnston, David T. Schrag, Daniel P. |
spellingShingle |
Macdonald, Francis A. Schmitz, Mark D. Crowley, James L. Roots, Charles F. Jones, David S. Maloof, Adam C. Strauss, Justin V. Cohen, Phoebe A. Johnston, David T. Schrag, Daniel P. Calibrating the Cryogenian |
author_facet |
Macdonald, Francis A. Schmitz, Mark D. Crowley, James L. Roots, Charles F. Jones, David S. Maloof, Adam C. Strauss, Justin V. Cohen, Phoebe A. Johnston, David T. Schrag, Daniel P. |
author_sort |
Macdonald, Francis A. |
title |
Calibrating the Cryogenian |
title_short |
Calibrating the Cryogenian |
title_full |
Calibrating the Cryogenian |
title_fullStr |
Calibrating the Cryogenian |
title_full_unstemmed |
Calibrating the Cryogenian |
title_sort |
calibrating the cryogenian |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2010 |
url |
http://dx.doi.org/10.1126/science.1183325 https://www.science.org/doi/pdf/10.1126/science.1183325 |
genre |
glacier* Northwest Territories Yukon |
genre_facet |
glacier* Northwest Territories Yukon |
op_source |
Science volume 327, issue 5970, page 1241-1243 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.1183325 |
container_title |
Science |
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327 |
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5970 |
container_start_page |
1241 |
op_container_end_page |
1243 |
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1810445352492335104 |