News Photos
Source: University of Wisconsin-Madison
Illustration by: Dan Brennan.
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For further assistance regarding the content of this illustration, contact Terry Devitt, 608-262-8282, trdevitt@facstaff.wisc.edu. For further assistance regarding the use of this illustration, contact Nick Weaver, 608-263-9141, jnweaver@facstaff.wisc.edu.
Caption:
Microscopic view of a zircon crystal determined to be 4.4 billion years old making it the world's oldest known terrestrial material. Zircon is a mineral commonly used to determine the geological age of rocks. Chemical analysis of this grain suggests that the Earth was cool enough to have water, a hydrospehere and, possibly, life much earlier than previously thought.
Photo credit: courtesy John W. Valley, UW-Madison professor of geology and geophysics
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Caption: John Valley, geology and geophysics.
Photo credit: Jeff Miller
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Photo use
Photographs are available to media organizations and University of Wisconsin-Madison departments for news, editorial and public relations uses, both print and electronic, that are directly related to UW-Madison. They are NOT available for generic use. For university-related use -- including textbooks, commercial products or advertising -- please contact Jeff Miller, University Communications, (608) 262-0067 or jbmille1@wisc.edu.
Published photos must include a credit ("photographer's name/University of Wisconsin-Madison" or "courtesy of"). The specific credit and other details are also embedded in the digital file, which can be viewed by using Photoshop and selecting "file>file info."
None of these images may be modified, altered or used in any way that changes or misrepresents the photograph's content or overall context.