The primary defined divisions of time are eons, in sequence the Hadean, the Archean, the Proterozoic and the Phanerozoic.The first three of these can be referred to collectively as the Precambrian supereon. Structure and development of a microcontinent; Elan Bank in the southern Indian Ocean, Geochem.

bekker dating rise atmospheric oxygen-40

"Breakup and Early Seafloor Spreading between India and Antarctica." Geophysical Journal International 170, no. References Antretter, M., Steinberger, B., Heider, F., Soffel, H. Paleolatitudes of the Kerguelen hotspot: new paleomagnetic results and dynamic modelling, Earth Planet.

Dietmar Mller, Belinda Brown, Takemi Ishihara, and Sergey Ivanov.

Paleontological observations have been documented as far back as the 5th century BC. It now uses techniques drawn from a wide range of sciences, including biochemistry, mathematics, and engineering.

The science became established in the 18th century as a result of Georges Cuvier's work on comparative anatomy, and developed rapidly in the 19th century. Use of all these techniques has enabled paleontologists to discover much of the evolutionary history of life, almost all the way back to when Earth became capable of supporting life, about 3.8 billion years ago.

J., Bekker, A., 2009, Re-Os depositional age for Archean carbonaceous slates from the southwestern Superior Province: Challenges and insights, EPSL, v.

F., Grenne, T., Bekker, A., 2009, Seafloor-hydrothermal Si-Fe-Mn exhalites in the Pecos greenstone belt, New Mexico, and the redox state of ca.

The final quarter of the 20th century saw the development of molecular phylogenetics, which investigates how closely organisms are related by measuring how similar the DNA is in their genomes.

Molecular phylogenetics has also been used to estimate the dates when species diverged, but there is controversy about the reliability of the molecular clock on which such estimates depend.

The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time, and is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.

The tables of geologic time spans, presented here, agree with the nomenclature, dates and standard color codes set forth by the International Commission on Stratigraphy.

Ph D Virginia Polytechnic Institute and State University 1996-2001MS University of Minnesota, Duluth 1994-1996Leningrad Mining Institute, Russia 1984-1989Specialty: Precambrian Geologist with expertise in Sedimentology and Stratigraphy and Geochemistry Email: [email protected]: (951) 827-4611Office: Geology 408 Research Interests: Paleoproterozoic chemostratigraphy and event stratigraphy, climate changes in the deep past, rise in atmospheric oxygen, chemical composition of the atmosphere and ocean and its link with global tectonics, ocean redox state in the Precambrian, C, S, and Fe cycles, first appearance of marine sulfate evaporites, sedimentary mineral deposits, stable isotope geochemistry.