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Learning to tell Neoproterozoic time.

A H Knoll1

  • 1Botanical Museum, Harvard University, Cambridge, MA 02138, USA.

Precambrian Research
|September 7, 2001
PubMed
Summary

Scientists improved the understanding of the Terminal Proterozoic Period using multidisciplinary research. This work provides a framework for correlating events like the Marinoan ice age and Ediacaran animal diversification.

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Area of Science:

  • Geosciences
  • Paleontology
  • Stratigraphy

Background:

  • The Terminal Proterozoic Period (approx. 720-541 million years ago) is critical for understanding major Earth system changes.
  • Establishing a precise timeline for this period has been challenging due to limited high-resolution data.

Purpose of the Study:

  • To improve the correlation and calibration of events within the latest Proterozoic Era.
  • To establish a robust temporal framework for analyzing tectonic, biogeochemical, climatic, and biological events.
  • To provide a rational basis for selecting a Global Stratotype Section and Point (GSSP) for the period.

Main Methods:

  • Multidisciplinary research involving scientists from numerous countries.
  • Chemostratigraphy and biostratigraphy utilizing single-celled microfossils (acritarchs).
  • Integration of high-resolution radiometric dating.

Main Results:

  • Significant advancements in the framework for correlating and calibrating latest Proterozoic events.
  • Defined the interval by key phenomena: Marinoan ice age, Ediacaran animal diversification, and the start of the Cambrian Period.
  • Developed a temporal framework essential for evaluating terminal Proterozoic events.

Conclusions:

  • The research provides a strong foundation for defining the beginning of the Cambrian Period with a GSSP.
  • Potential exists for achieving similar stratigraphic resolution for the preceding Cryogenian Period.
  • Future prospects include lower Neoproterozoic correlation and subdivision, though data are currently limited.
Keywords:
NASA Discipline ExobiologyNon-NASA Center

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