The least-squares line and plane and the analysis of palaeomagnetic data
- J. Kirschvink
- Geology
- 1 September 1980
Summary
The classic, multivariate technique of principal component analysis can be used to find and estimate the directions of lines and planes of best least-squares fit along the demagnetization…
Late Proterozoic low-latitude global glaciation: the snowball Earth
- J. Kirschvink
- Geology, Environmental Science
- 20 November 1992
A fundamental question of earth history concerns the
nature of the Late Proterozoic glaciogenic sequences that are
known from almost all of the major cratonic areas, including North America, the…
The Paleoproterozoic snowball Earth: a climate disaster triggered by the evolution of oxygenic photosynthesis.
- R. Kopp, J. Kirschvink, I. Hilburn, C. Z. Nash
- Geography, GeologyProceedings of the National Academy of Sciences…
- 9 August 2005
It is argued that oxygenic cyanobacteria evolved and radiated shortly before the Makganyene snowball, and could have destroyed a methane greenhouse and triggered a snowball event on time-scales as short as 1 million years.
Low-latitude glaciation in the Palaeoproterozoic era
- D. Evans, N. Beukes, J. Kirschvink
- Environmental Science, GeographyNature
- 20 March 1997
One of the most fundamental enigmas of the Earth's palaeoclimate concerns the temporal and spatial distributions of Precambrian glaciations. Through four billion years of Precambrian history,…
Paleoproterozoic snowball earth: extreme climatic and geochemical global change and its biological consequences.
- J. Kirschvink, E. Gaidos, R. Steinberger
- Geology, Environmental ScienceProceedings of the National Academy of Sciences…
- 15 February 2000
Geological, geophysical, and geochemical data support a theory that Earth experienced several intervals of intense, global glaciation ("snowball Earth" conditions) during Precambrian time. This…
Age of Neoproterozoic bilatarian body and trace fossils, White Sea, Russia: implications for metazoan evolution.
- M. W. Martin, D. Grazhdankin, S. Bowring, D. Evans, M. Fedonkin, J. Kirschvink
- Geology, Environmental ScienceScience
- 5 May 2000
A uranium-lead zircon age for a volcanic ash interstratified with fossil-bearing, shallow marine siliciclastic rocks in the Zimnie Gory section of the White Sea region indicates that a diverse assemblage of body and trace fossils occurred before 555.3 +/- 0.3 million years ago, making co-occurring trace fossils the oldest that are reliably dated.
The identification and biogeochemical interpretation of fossil magnetotactic bacteria
- R. Kopp, J. Kirschvink
- Geography, Environmental Science
- 2008
Zircon U-Pb ages for the Early Cambrian time-scale
- W. Compston, I. Williams, J. Kirschvink, Zhang Zichao, M. Guogan
- GeologyJournal of the Geological Society
- 1 March 1992
Single zircons from two Early Cambrian volcanic horizons have been analysed using the SHRIMP ion microprobe. Full details of the analytical procedures and data reduction are given. Zircons from tuff…
Abrupt and Gradual Extinction Among Late Permian Land Vertebrates in the Karoo Basin, South Africa
- P. Ward, J. Botha, Roger M. H. Smith
- Geography, Environmental ScienceScience
- 4 February 2005
The vertebrate fossil data show a gradual extinction in the Upper Permian punctuated by an enhanced extinction pulse at the Permians-Triassic boundary interval, particularly among the dicynodont therapsids, coinciding with negative carbon-isotope anomalies.
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