Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Site Tools

  • AAAS
  • Subscribe
  • Feedback

Site Search

Search Advanced

Science 30 July 2004:
Vol. 305. no. 5684, pp. 621 - 622
DOI: 10.1126/science.1098803
Prev | Table of Contents | Next

Perspectives

GEOLOGY:
A New Period for the Geologic Time Scale

Andrew H. Knoll, Malcolm R. Walter, Guy M. Narbonne, Nicholas Christie-Blick

The geologic time scale is in need of an update, given that the last modification took place in 1891. In their Perspective, Knoll and colleagues announce the proud addition of a new interval to the geologic time scale, the Ediacaran Period, by the International Union of Geological Sciences.

A. H. Knoll is in the Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA. M. R. Walter is at the Australian Centre for Astrobiology, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia. G. M. Narbonne is in the Department of Geological Sciences and Geological Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada. N. Christie-Blick is in the Department of Earth and Environmental Sciences and Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA. E-mail: aknoll{at}oeb.harvard.edu

Read the Full Text


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Geochronologic constraints on the chronostratigraphic framework of the Neoproterozoic Huqf Supergroup, Sultanate of Oman.
S. A. Bowring, J. P. Grotzinger, D. J. Condon, J. Ramezani, M. J. Newall, and P. A. Allen (2007)
Am J Sci 307, 1097-1145
   Abstract »    Full Text »    PDF »
Charnia and sea pens are poles apart.
J. B. Antcliffe and M. D. Brasier (2007)
Journal of the Geological Society 164, 49-51
   Abstract »    Full Text »    PDF »
Toward a Neoproterozoic composite carbon-isotope record.
G. P. Halverson, P. F. Hoffman, D. P. Schrag, A. C. Maloof, and A. H. N. Rice (2005)
GSA Bulletin 117, 1181-1207
   Abstract »    Full Text »    PDF »
A uniquely preserved Ediacaran fossil with direct evidence for a quilted bodyplan.
S. Xiao, B. Shen, C. Zhou, G. Xie, and X. Yuan (2005)
PNAS 102, 10227-10232
   Abstract »    Full Text »    PDF »
From The Cover: Origin of the Eumetazoa: Testing ecological predictions of molecular clocks against the Proterozoic fossil record.
K. J. Peterson and N. J. Butterfield (2005)
PNAS 102, 9547-9552
   Abstract »    Full Text »    PDF »
U-Pb sensitive high-resolution ion microprobe ages from the Doushantuo Formation in south China: Constraints on late Neoproterozoic glaciations.
S. Zhang, G. Jiang, J. Zhang, B. Song, M. J. Kennedy, and N. Christie-Blick (2005)
Geology 33, 473-476
   Abstract »    Full Text »    PDF »


ADVERTISEMENT
Click Me!

ADVERTISEMENT
Click Me!

To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)