Second clock supports orbital pacing of the ages: paleoclimatology
Article Abstract:
Climatological evidence from marine sediments had supported the theory that changes in earth's orbit had triggered the ice ages, while data from Devil's Hole in Nevada had contradicted it. A new uranium-protactinium dating method shows that dates from both sources were correct, and a dilemma still exists.
Publication Name: Science
Subject: Science and technology
ISSN: 0036-8075
Year: 1997
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Ice bubbles confirm big chill
Article Abstract:
Measurements of nitrogen-isotope ratios in gas bubbles deep in the ice sheet suggest that Greenland was 14 degrees C colder than the present. Previous measurements of a 7-degree difference were obtained from oxygen isotopes, in bubbles of air that may have traveled from far away.
Publication Name: Science
Subject: Science and technology
ISSN: 0036-8075
Year: 1996
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