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Don't Panic Geocast

John Leeman and Shannon Dulin discuss geoscience and technology weekly for your enjoyment! Features include guests, fun paper Friday selections, product reviews, and banter about recent developments. Shannon is a field geologist who tolerates technology and John is a self-proclaimed nerd that tolerates geologists.
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Don't Panic Geocast
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Feb 20, 2015

This week we discuss the geologic time scale, meteorites, and fitness trackers!

Pittsburgh Fireball Feb. 17, 2015

Geologic Time-it’s really big (and deep)

How do we begin to define Geologic time?

  • International Commission on Stratigraphy: “ International Geologic Time Scale; thus setting global standards for the fundamental scale for expressing the history of the Earth”
  • We have to have a baseline so that we can all talk about the “same” rocks across the world

Age-dating rocks

  • Many techniques, and the actual dates between our epochs change all the time as our age-dating techniques evolve
  • Many periods/eras/epochs are marked by “catastrophic” occurrences, hence making them natural boundaries, but the dates change.
  • 5 major extinction events

Time as an arrow v. time as a cycle

  • Catastrophism vs. uniformitarianism and gradualism
  • Constantly evolving and vastly interesting
  • Thinking about the definitions of time and how we as humans try to grasp the enormity of geologic time in particular is humbling.

Fun Paper Friday

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